OOIR: Observatory of International Research

Papers

(The TQCC of Sustainable Energy & Fuels is 8. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-11-01 to 2025-11-01.)

Article	Citations
Revealing the impact of the host-salt non-stoichiometry on the performance of perovskite solar cells	263
Ultrathin electron and proton-conducting membranes for nanoscale integrated artificial photosystems	198
Dual functions of a microfluidic fuel cell as electricity generation and liquid pumping units	164
A rational strategy for substantially enhancing the solar-utilization efficiency and organic-pollutant-degradation rate via mediated central processing unit filling	121
Photocatalytic CO₂ reduction to methanol integrated with the oxidative coupling of thiols for S–X (X = S, C) bond formation over an Fe₃O₄/BiVO₄ composite	114
Front cover	111
The synergistic effect of fluorine atom and alkyl chain positions in enhancing organic photovoltaic open-circuit voltage and morphology miscibility	107
A geothermal energy techno-economic analysis for downhole wellbore hydrogen production from biogas with subsurface carbon retention	98
Back cover	96
Back cover	83
Inside front cover	81
Rational design of a g-C₃N₄/Bi₂S₃/ZnS ternary heterojunction photoanode for improved solar water splitting	78
Correction: Photocatalytic CO₂ reduction to methanol integrated with the oxidative coupling of thiols for S–X (X = S, C) bond formation over an Fe₃O₄/BiVO₄	69
Microbubble synthesis of hybridised bacterial cellulose–gelatin separators for multifunctional supercapacitors	65
Inside front cover	63
Correction: Tribo-piezoelectric nanogenerators for energy harvesting: a first-principles study	61
Rapid laser synthesis of medium-entropy alloy nanostructures for neutral seawater electrolysis	58
Front cover	58
Back cover	55
Contents list	52
Contents list	52
Comprehensive insights into the impact of straw types, temperature and atmosphere on pyrochar properties and its enhancement potential for anaerobic digestion	51
Perspectives and advances in consolidated bioprocessing strategies for lignin valorization	50
Fusion of nitro isomers of naphthoquinone enhances capacity and cyclability in Zn-ion batteries	48
Vanadium-doped cobalt selenide: an efficient bifunctional electrocatalyst for overall water splitting	46

State and prospects of photovoltaic module waste generation in China, USA, and selected countries in Europe and South America	46
Methane conversion coupled with hydrogen production from water using Au/Ga₂O₃ photocatalysts prepared by different methods	46
Dual engineering of electronic structure and nanoconfinement for high-efficiency ammonia borane hydrolysis over PtCo-oxCNH catalysts	45
What is necessary to fill the technological gap to design sustainable dye-sensitized solar cells?	45
A ZIF-8 composite SiO₂-enhanced high-performance PEO-based solid-state electrolyte for Li-metal batteries	44
Prediction of sustainable aviation fuel properties for liquid hydrocarbons from hydrotreating biomass catalytic fast pyrolysis derived organic intermediates	44
Hydrolysis of anhydrosugars derived from pyrolysis of lignocellulosic biomass for integration in a biorefinery	43
Biocrude production via hydrothermal liquefaction of Canadian lignocellulosic residues for sustainable transportation: screening, catalytic effect, and modelling	42
A bifunctional electrocatalyst for alkaline seawater splitting using ruthenium doped nickel molybdenum phosphide nanosheets	40
Statistical analysis of ethanol/diesel dual-fuel combustion of compression ignition engines in RCCI mode using multi-injection strategies	40
Improving levoglucosan and hydrocarbon production through gas-phase synergy during cellulose and polyolefin co-pyrolysis	40
Enhanced performance of carbon-based CsPbI₂Br perovskite solar cells using interfacial modifiers	40
Nitro-oxidized carboxylated cellulose nanofiber based nanopapers and their PEM fuel cell performance	40
Front cover	38
Synthesis of an SBA-15 supported NiPtN catalyst for dehydrogenation of hydrazine hydrate	38
The annual-hydrogen-yield-climatic-response ratio: evaluating the real-life performance of integrated solar water splitting devices	38
Sulfhydryl modified silver-titanium oxide to effectively and stably promote the electrocatalytic reduction of carbon dioxide to CO	38
Highly efficient Ru-decorated CeO₂ for photocatalytic hydrogenation and cyclization of levulinic acid to γ-valerolactone	37
Solar to hydrogen efficiency of 28.2% under natural sunlight achieved by a combination of five-junction concentrator photovoltaic modules and electrolysis cells	36
Synthesis of P-doped CdS nanorods for efficient blue LED light induced photocatalytic hydrogen evolution	36
An integrated approach to waste tire pyrolysis for value-added products: process optimization and a comprehensive economic study for scalability	35
Synthesis of urea from CO₂ and N₂ fixation under mild conditions using polarized hydroxyapatite as a catalyst	35
Advancing hydrothermal liquefaction of Canadian forestry biomass for sustainable biocrude production: co-solvent integration, co-liquefaction, and process optimization	35
Enhanced electrochemical discharge of Li-ion batteries for safe recycling	35
Dopant-free fluorene based dimers linked with thiophene units as prospective hole transport materials for Sb₂S₃ solar cells	35
A layered double hydroxides/MXene composite based triboelectric nanogenerator for energy harvesting and self-powered electroplating applications	34
Hierarchical layered nickel–iron double hydroxide/carbon nanotube fiber electrode for constructing asymmetric fiber supercapacitor	34
Effect of ZnO and PEDOT:PSS charge selective layers on photovoltage of cuprous oxide (Cu₂O) heterojunction solar cells	34
Platform chemicals from hardwood black liquor via hydrothermal liquefaction: influence of process conditions on product yields and quality	33
Modulating CsPbBr₃ nanocrystals encapsulated in PCN-224(Zr) for boosting full-spectrum-driven CO₂ reduction: S-scheme transfer, photothermal-synergistic effect, and DFT calculati	33
Plasmonic Au nanoparticle sandwiched CuBi₂O₄/Sb₂S₃photocathode with multi-mediated electron transfer for efficient solar water splitting	33
Free-standing P-doped Fe₂O₃/ZnO nanotubes as a bifunctional electrocatalyst for electrochemical water splitting	33
Enhanced room-temperature thermoelectric power factor of β-Zn₄Sb₃ thin films via surface roughness optimization	32
The structural factors affecting the sensory properties of polyaniline derivatives	32
Nitrogen-doped porous carbon nanosheets as a robust catalyst for tunable CO₂ electroreduction to syngas	32
Unveiling the mechanism of CO₂ electroreduction to C₁ and C₂ products of ordered double transition metal MXenes	32
Hard–soft carbon decorated Na₃V₂(PO₄)₃ cathode for high-rate and stable sodium-ion batteries	32
Catalytic heterostructured materials for CO₂ mitigation and conversion into fuels: a renewable energy approach towards a sustainable environment	32
Hydrodeoxygenation reactivity of the carbonyl group and carboxyl group and their interaction: taking 2-pentanone, valeric acid, and levulinic acid as examples	31
An integrated carbonized wood-based gas-diffusion electrode for high-current-density CO electrosynthesis in flow cells	31
Front cover	30
Graphene-based materials as electrocatalysts for the oxygen evolution reaction: a review	30
Inside front cover	30
Inside front cover	29
Front cover	29
Back cover	29
Correction: Effects of the support on bifunctional one-step synthesis of methylal via methanol oxidation catalysed by Fe–Mo-based bifunctional catalysts	29
Back cover	29
Transition metal-based coordination polymers of bipyridyl-ethylene for sunlight-driven photocatalytic CO₂ reduction into CO	28
Na-ion dynamics in the solid solution Na_xCa_1−xCr₂O₄ studied by muon spin rotation and neutron diffraction	28

Stable lithium plating/stripping electrochemistry promoted by a MnO₂ modified copper current collector for stable lithium metal anodes	28
Towards the thermal stability of dye-sensitized solar cells for wavelength-selective greenhouses using the polymorphism of light-scattering layers	28
Self-shape-transformable 3D tessellated bifacial crystalline Si solar cell module enabling extra energy gain through intervals and an integrated actuator	28
Infant diaper waste-derived multifunctional MoN-Ni₃C@CFs for full water splitting at neutral and alkaline pH and solar-to-hydrogen conversion: a win–win combination	28
Evaluation of environmental impacts of a perovskite solar cell with a p-i-n meso-superstructured architecture through life cycle assessment	28
Performance evaluation of an automotive thermoelectric generator with a non-isometric distributed fin heat exchanger	27
A brief review of in situ spectroscopic methods and electrochemical sensors as essential evaluation tools for the electrochemical reduction of CO₂ (ElRC)	27
An asymmetric polyether sulfone membrane as an efficient separator in aluminium–graphite batteries with EMIMCl/AlCl₃ electrolyte	27
Hydrocarbons from kraft pulp pre-hydrolysis liquors in two steps using heterogeneous catalysis	27
Catechin-induced cellulose: a new material for harvesting triboelectricity	27
Coordination of Ti³⁺ and Ni³⁺ to promote the electrocatalytic OER properties of SrTiO₃@TiO₂ heterojunctions	27
Selective conversion of hydroxymethylfurfural to diformylfuran using copper hydroxide nitrate with various nano-structures: a comparative study	27
Catalytic cracking and deoxygenation of cottonseed oil to yield light olefins over lanthanum-impregnated zeolite catalysts	26
Enhanced discharge capacity of thermorechargeable batteries composed of Cd-PBA and a potential-matched PBA	26
Transient HCO/HCOO⁻ species formation during Fischer–Tropsch over an Fe–Co spinel using low Ribblet ratio syngas: a combined operando IR and kinetic study	26
Aluminum methylamidoborane complexes: mechanochemical synthesis, structure, stability, and reactive hydride composites	26
The pretreatment of softwood chips and pellets by alkali sulfonation and thermomechanical pulping and its influence on lignin redistribution and the enzyme mediated hydrolysis of the cellulose compone	26
Front cover	25
Front cover	25
Contents list	25
Organic semiconductor nanoparticles for visible-light-driven CO₂ conversion	25
Synergistic action of highly-active porous carbon-based bifunctional electrocatalysts and neutral electrolyte: endowing zinc–air batteries with ultra-long cycle stability	25
Front cover	25
Remarkable power factor improvement in a porous, nanostructured thermoelectric oxide functionalized with viologen molecules	24
Three-dimensional porous metal phosphide cathode electrodes prepared via electroless galvanic modification for alkaline water electrolysis	24
Latest advances in research methods for high-yield cellulase production	24
Highly active Pd–ZrO₂ electrodes for hydrogen evolution reaction	24
Superior performance of silicon nanowires@void@carbon on a conductive substrate as a scalable binder-free anode electrode for lithium-ion batteries	23
Novel benzodithiophene-TTBTBTT copolymers: synthesis and investigation in organic and perovskite solar cells	23
Effect of ZrO₂/CeO₂ mixed oxides on fuel gas production during self-sustaining smouldering combustion of lignocellulosic wastes	23
(111) Facet-engineered SnO₂ as an electron transport layer for efficient and stable triple-cation perovskite solar cells	23
Cobalt-doped vanadium nitride composite carbon hollow spheres for enhanced lithium–sulfur battery performance: overcoming sulfur dissolution and the shuttle effect	23
Thermal-integration in photoelectrochemistry for fuel and heat co-generation	23
Archetypical 2D sheet-like Cu₂MoS₄ for all-solid-state symmetric pseudocapacitors with ultra-steady performance efficiency	23
An electric-field regulated crystallization process for enhanced performance of perovskite solar cells	23
Facile preparation of N-doped graphitic carbon encapsulated nickel catalysts for transfer hydrogenolysis of lignin β-O-4 model compounds to aromatics	23
Organic materials as charge hosts for pseudocapacitive energy storage	23
Integration of formic acid dehydrogenation with electrochemical pumping for the generation of clean hydrogen	23
Hierarchical ZSM-5 nanosheets for production of light olefins and aromatics by catalytic cracking of oleic acid	23
FeCo alloy nanoparticles encapsulated in hollow N-doped carbon as a bifunctional electrocatalyst for aqueous zinc–air batteries with a low voltage gap	23
Enhancing FAPbI₃ perovskite solar cell performance with a methanesulfonate-based additive	23
Precise control of TiO₂ overlayer on hematite nanorod arrays by ALD for the photoelectrochemical water splitting	23
Efficient electrochemical water oxidation catalyzed by N₄-coordinated nickel complexes under neutral conditions	22
An efficient self-driven fog harvesting system based on a Kelvin waterdrop generator	22
Solar rechargeable battery using the lithium-ion storage mechanism in high capacity MoO₃ films	22
Recent advances in transition metal dichalcogenide-based heterostructured materials for electrochemical water splitting applications	22
Cellulose as sacrificial agents for enhanced photoactivated hydrogen production	22
Enhanced electron collection in a particulate LaTiO₂N photoanode assembled with an inserted ZnO nanorod array for photoelectrochemical water oxidation	22
NiO Composite with Blackberry Seeds Derived Activated Carbon (NiO/BBSDAC) for Improved Electrochemical Behavior of Lithium-ion Batteries Anode	22
A perspective on the evolution and journey of different types of lithium-ion capacitors: mechanisms, energy-power balance, applicability, and commercialization	22
Energy, economic, and environmental impacts assessment of co-optimized on-road heavy-duty engines and bio-blendstocks	22
Chemical reduction of Prussian blue nanocubes to obtain alkali ion containing cathodes and their battery applications	21
Designing idealised devices for bias-free solar water splitting	21
Interfacial modification of Zn foil electrode with cationic surfactants enables efficient and selective CO production from CO₂ electroreduction	21
A critical review of hydrogen storage: toward the nanoconfinement of complex hydrides from the synthesis and characterization perspectives	21
Preparation of a N-doped Si/Cu/C anode for high-performance lithium-ion batteries	21
Back cover	21
Boosted photoredox capability of visible light-active P-doped C₃N₄ with efficient harvesting of electron–hole pairs	21
Techno-economic analysis of a solar-driven biomass pyrolysis plant for bio-oil and biochar production	21
Nano-interfaced tungsten oxide decorated on layered double hydroxides for the oxygen evolution reaction	21
Synthesis of hierarchical MFI zeolite by interzeolite conversion of spent FAU zeolite for the methanol-to-olefins reaction	21
High surface area MnO₂nanomaterials synthesized by selective cation dissolution for efficient water oxidation	21
On the understanding of bio-oil formation from the hydrothermal liquefaction of organosolv lignin isolated from softwood and hardwood sawdust	21
Front cover	20
Unravelling the role of iron carbide in oxygen reduction catalysts for rechargeable zinc–air batteries: a comprehensive kinetics & mechanistic study	20
Back cover	20
Contents list	20
Correction: Carbon onion/sulfur hybrid cathodes via inverse vulcanization for lithium–sulfur batteries	20
Back cover	20
Navigating the challenges of global NO_x emissions throughout the energy transition: state of play and outlook	20
A new type of pyranthrene-based copolymer as a promising hole-transport material for perovskite solar cells	20
Back cover	20
Electronic structure regulation of RuIrTaO_x induces highly efficient acidic OER	20
Experimental and computational analysis of Ni–P and Fe–P metal foams for enhanced hydrogen evolution reaction in alkaline media	20
Novel porous Al-based composites for improved Al–water reaction performances by spark plasma sintering	20
Enhancing photovoltaic efficiency and sustainability: the role of ion beam technology and AI integration	20
Contents list	20
Contents list	20
Contents list	20
Simultaneous non-invasive gas analysis in artificial photosynthesis reactions using rotational Raman spectroscopy	19

Research progress of coal gangue-based modified materials and the sewage treatment field	19
A conjugated polymer coupled with graphitic carbon nitride for boosting photocatalytic hydrogen generation under visible light	19
Maximizing sustainable bioethanol production from food waste: progress in diverse pretreatment methods and integration of artificial intelligence	19
Effect of ancillary ligand substitution on photocatalytic hydrogen production	19
Sustainable syngas generation from methane: enhanced catalysis with metal-promoted nickel on silica–alumina composites	19
Carbon capture from corn stover ethanol production via mature consolidated bioprocessing enables large negative biorefinery GHG emissions and fossil fuel-competitive economics	19
Potassium-modified bifunctional MgAl-SBA-15 for aldol condensation of furfural and acetone	19
A manganese complex on a gas diffusion electrode for selective CO₂ to CO reduction	19
Direct ink writing-based 3D printing of supercapacitors for flexible and wearable electronic applications	19
The cooperative role of nitrogen defects and cyano-group functionalization in carbon nitride towards enhancing its CO₂photoreduction activity	19
Electrode engineering considerations for high energy efficiency Li–CO₂ batteries	19
Surface anchored atomic cobalt-oxide species coupled with oxygen vacancies boost the CO-production yield of Pd nanoparticles	19
New nonflammable tributyl phosphate based localized high concentration electrolytes for lithium metal batteries	19
Pentafluorosulfanyl-functionalised BODIPY push–pull dyes for p-type dye-sensitized solar cells	19
A wave energy harvesting system for applications in deep-sea exploration	19
Construction of a highly active and water-resistant Ni-based catalyst for the HDO reaction of phenol	19
Optimization of bacterial biorefineries for sustainable biodiesel production and flue gas reduction: a holistic approach to climate change mitigation and circular economy	19
Synthesis of jet fuel and diesel range cycloalkanes with 2-methylfuran and benzaldehyde	19
Salicylic acid treated Li₇La₃Zr₂O₁₂ achieves dual functions for a PEO-based solid polymer electrolyte in lithium metal batteries	19
Sustainable porous carbons from tannic acid based KOH activated as high-performance CO₂ capture sorbents	19
A novel covalent triazine-based frameworks as photocatalysts for the degradation of dyes under visible light irradiation	19
Flexible laser-induced graphene-based electrodes modified with cobalt-manganese hexacyanoferrate as cathode materials for asymmetric supercapacitors	19
Back cover	19
Application and research progress of transparent radiative cooling materials – a review	19
Adsorptive denitrogenation of model fuel with silica gel	19
Boosting oxygen evolution with electrodes composed of metal sulfides and hydrogen bonded organic frameworks	18
Front cover	18
Aging of quinoxaline-based polymer solar cells under UV-free white light	18
In situ characterization techniques for electrochemical nitrate-to-ammonia conversion	18
Selective placement of modifiers on hematite thin films for solar water splitting	18
Exploring the air stability of all-inorganic halide perovskites in the presence of photogenerated electrons by DFT and AIMD studies	18
High-purity hydrogen production from real biomass pyrolysis vapors via a chemical looping process	18
Enhancing the efficiency of non-fullerene organic solar cells by using a volatilizable solid additive system	18
A facile approach to deposit high performance electrocatalyst high entropy oxide coatings using a novel plasma spray route for efficient water splitting in an alkaline medium	18
MXene nanosheet-reinforced chitosan as a stable photothermal evaporator for efficient solar evaporation	18
Optimal design of a coupled photovoltaic–electrolysis-battery system for hydrogen generation	18
Application of rich-defect expanded graphite with improved ion transport and kinetics for sodium storage at low temperature	18
Porous silicon-nanowire-based electrode for the photoelectrocatalytic production of hydrogen	18
A review of recent progress on enhancing the stability of CsPbX₃ perovskite solar cells	18
Front cover	18
Enhanced thermoelectric properties of Cu_1.8S via the introduction of ZnS nanostructures	17
Magnetically recoverable high-entropy alloy catalyst in carbon matrix for ammonia borane-driven hydrogen evolution and electrocatalytic hydrogen production	17
Back cover	17
Contents list	17
Correction: On the environmental competitiveness of sodium-ion batteries under a full life cycle perspective – a cell-chemistry specific modelling approach	17
Expression of biocatalysts and their use in monomer synthesis for biodegradable polymers from acetone and CO₂	17
Back cover	17
Predicting the physical properties of three-component lignocellulose derived advanced biofuel blends using a design of experiments approach	17
Rational design of a g-C₃N₄/CdS/MIL-125 (Ti)-derived TiO₂ ternary heterojunction as a highly efficient photocatalyst for wastewater treatment under visible-light irrad	17
Correction: A review on thermochemical based biorefinery catalyst development progress	17
Chemical CO₂ fixation using a green biocatalytic system based on Ugi conjugated cobalt phthalocyanine on cellulose	17
A facile strategy of “laser-direct-writing” to develop self-supported Ni₃₀B₇₀–Ti catalysts for boosted and durable alkaline oxygen evolution	17
Design of thick electrodes for high-performance lithium-ion batteries: a comprehensive perspective under coupled kinetics and thermodynamics	17
Tunable electrocatalytic H₂ evolution activity of nickel-dithiolene coordination polymers	17
Sb₂S₃ solar cells with a cost-effective and dopant-free fluorene-based enamine as a hole transport material	17
Highly stable CsFAPbIBr perovskite solar cells with dominant bulk recombination at real operating temperatures	17
Front cover	17
High performance alkyl dialkoxyalkanoate bioderived transportation fuels accessed using a mild and scalable synthetic protocol	17
Visible light induced efficient photocatalytic hydrogen production by graphdiyne/CoSe ohmic heterojunction	17
Oxalate metal–organic framework derived atomic Ru³⁺-doped Co(OH)₂nanosheets for a highly efficient hydrogen evolution reaction	16
Single atom functionalization in vanadium dichalcogenide monolayers: towards enhanced electrocatalytic activity	16
Life cycle greenhouse gas emissions and carbon intensity of U.S. fuel use and projection for the next 10 years-based on built capacity and expansion plans	16
A new simple volatile solid additive triggers morphological optimization and performance stabilization in polymer solar cells	16
Inside front cover	16
The electrochemical and physicochemical impacts of sodium chloride on the formation of a self-healing double network hydrogel using two methods – post-treatment and in situ integration	16
A dual system piezoelectric energy harvester for harvesting low frequency ocean energy	16
An interesting carrier: the excellent performance of Nb₂O₅ in biomass hydrodeoxygenation	16
Dendrite-free deposition and side-reaction suppression of zinc anodes achieved via constructing synergistic interface buffer layers	16
Fine comminution of torrefied wheat straw for energy applications: properties of the powder and energy balances of the production route	16
Accelerating oxidation of 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid by high entropy alloy catalyst design under base-free conditions	16
Triggering the water oxidation kinetics of NiMoO-NC for sustainable green hydrogen production	16
Ferromagnetic–antiferromagnetic interfaces in MAX phase electrocatalysts: a spin-driven platform for enhanced oxygen evolution reaction	16
Recombination vs. dye packing: role of structural tailoring of triphenylamine-based D–π–A dyes for outdoor/indoor photovoltaics with dual-species copper electrolytes	16
Surfactant stabilization of vanadium iron oxide derived from Prussian blue analog for lithium-ion battery electrodes	16
Enhanced thermal management in CO₂ methanation using spiral-structured catalysts: a comparative study with honeycomb, monolith, and packed-bed systems	16
Influence of loblolly pine anatomical fractions and tree age on oil yield and composition during fast pyrolysis	16
Chloride-improved crystallization in sequentially vacuum-deposited perovskites for p–i–n perovskite solar cells	16
Distinctive conductivity improvement by embedding Cu nanoparticles in the carbon shell of submicron Si@C anode materials for LIBs	16
Investigating the effect of rGO on microstructural and electrical properties of La_0.9Sr_0.1Ga_0.8Mg_0.2O₃ in intermediate temperature SOFCs	16
Destabilization of ammonia borane via dual confinement in a cobalt-based Prussian blue analogue	16
Choosing a liquid hydrogen carrier for sustainable transportation	16
A genipin-crosslinked chitosan hydrogel as a quasi-solid-state electrolyte for sustainable electrochemical capacitors	16
Inside front cover	15
Contents list	15
Front cover	15
NiO–Ti nanocomposites for contact electrification and energy harvesting: experimental and DFT+U studies	15
Studies on bimetallic Cu–Ag supported alumina catalysts for hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran	15
Facile and scalable bilayer polymer encapsulation to achieve long-term stability of perovskite solar cells under harsh humidity conditions	15
Front cover	15
Infiltration of nickel and copper catalysts into a GDC backbone assisted by supercritical CO₂ for efficient SOFC anodes	15
Experimental study on hydrogen-rich fuel generation via ammonia decomposition using a structured catalytic reactor	15
Inside front cover	15
Design and synthesis of multifaceted dicyanomethylene rhodanine linked thiophene: a SnO_x–perovskite dual interface modifier facilitating enhanced device performance through improved	15
Aqueous phase hydrogenation of maleic acid to succinic acid mediated by formic acid: the robustness of the Pd/C catalytic system	15
Sustainable robust waste-recycled ocean water-resistant fly ash-carbon nanotube nanocomposite-based triboelectric nanogenerator	15