Enhanced Photocatalytic H₂O₂ Production over Carbon Nitride by Doping and Defect Engineering

ACS Catalysis, Год журнала: 2020, Номер 10(24), С. 14380 - 14389

Опубликована: Ноя. 24, 2020

Photocatalytic production of H2O2 from the reduction O2 by semiconductor photocatalysts (e.g., graphitic carbon nitride, C3N4) has been regarded as an alternative for small-scale decentralized production. However, efficiency pristine C3N4 is still limited narrow light absorption range and rapid charge recombination. Here, we presented a facile approach to simultaneously enhance promote separation introducing alkali metal dopants N vacancies on C3N4. The introduction successfully broadened range, reduced band gap 2.85 2.63 eV, greatly inhibited synergistic effect doping defect resulted in improvement photocatalytic performance with rate 10.2 mmol/h/g, which 89.5 times that Thus, this work not only gives insights into manipulating processes but also inspires further develop more efficient

Язык: Английский

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Enhanced photoelectrochemical performance of Z-scheme g-C3N4/BiVO4 photocatalyst

Applied Catalysis B Environment and Energy, Год журнала: 2018, Номер 234, С. 296 - 310

Опубликована: Апрель 23, 2018

Язык: Английский

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Black phosphorene as a hole extraction layer boosting solar water splitting of oxygen evolution catalysts

Nature Communications, Год журнала: 2019, Номер 10(1)

Опубликована: Май 1, 2019

Abstract As the development of oxygen evolution co-catalysts (OECs) is being actively undertaken, tailored integration those OECs with photoanodes expected to be a plausible avenue for achieving highly efficient solar-assisted water splitting. Here, we demonstrate that black phosphorene (BP) layer, inserted between OEC and BiVO 4 can improve photoelectrochemical performance pre-optimized OEC/BiVO (OEC: NiOOH, MnO x, CoOOH) systems by 1.2∼1.6-fold, while overlayer, in turn, suppress BP self-oxidation achieve high durability. A photocurrent density 4.48 mA·cm −2 at 1.23 V vs reversible hydrogen electrode (RHE) achieved NiOOH/BP/BiVO photoanode. It found intrinsic p -type boost hole extraction from prolong holes trapping lifetime on surface. This work sheds light design BP-based devices application solar fuel conversion, also suggests promising nexus semiconductor electrocatalyst.

Язык: Английский

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Perovskite Oxide Based Electrodes for High‐Performance Photoelectrochemical Water Splitting

Angewandte Chemie International Edition, Год журнала: 2019, Номер 59(1), С. 136 - 152

Опубликована: Фев. 21, 2019

Abstract Photoelectrochemical (PEC) water splitting is an attractive strategy for the large‐scale production of renewable hydrogen from water. Developing cost‐effective, active and stable semiconducting photoelectrodes extremely important achieving PEC with high solar‐to‐hydrogen efficiency. Perovskite oxides as a large family metal are extensively investigated electrodes in owing to their abundance, (photo)electrochemical stability, compositional structural flexibility allowing achievement electrocatalytic activity, superior sunlight absorption capability precise control tuning band gaps edges. In this review, research progress design, development, application perovskite summarized, special emphasis placed on understanding relationship between composition/structure activity.

Язык: Английский

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New Iron‐Cobalt Oxide Catalysts Promoting BiVO₄ Films for Photoelectrochemical Water Splitting

Advanced Functional Materials, Год журнала: 2018, Номер 28(34)

Опубликована: Июнь 26, 2018

Abstract Owing to the sluggish kinetics for water oxidation, severe surface charge recombination is a major energy loss that hinders efficient photoelectrochemical (PEC) splitting. Herein, simple process developed preparing new type of low‐cost iron‐cobalt oxide (FeCoO x ) as an co‐catalyst suppress on bismuth vanadate (BiVO 4 photoanodes. The FeCoO /BiVO photoanode exhibits high photocurrent density 4.82 mA cm −2 at 1.23 V versus reversible hydrogen electrode under AM 1.5 G illumination, which corresponds >100% increase compared pristine BiVO photoanode. also demonstrates separation efficiency ≈90% with excellent stability over 10 h, indicating catalytic performance in PEC process. Density functional theory calculations and experimental studies reveal incorporation Fe into CoO generates abundant oxygen vacancies forms p‐n heterojunction , effectively promotes hole transport/trapping from photocatalyst reduces overpotential evolution reaction (OER), resulting remarkably increased densities durability. This work feasible depositing cheap OER cocatalyst photoanodes

Язык: Английский

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Bismuth-based photocatalysts for solar energy conversion

Journal of Materials Chemistry A, Год журнала: 2020, Номер 8(46), С. 24307 - 24352

Опубликована: Янв. 1, 2020

Bismuth-based nanomaterials comprise a rich family of narrow bandgap photocatalysts, providing excellent opportunities for converting sunlight into chemical energy. This article is believed to promote the development efficient photocatalysts.

Язык: Английский

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High-efficiency Fe-Mediated Bi2MoO6 nitrogen-fixing photocatalyst: Reduced surface work function and ameliorated surface reaction

Applied Catalysis B Environment and Energy, Год журнала: 2019, Номер 256, С. 117781 - 117781

Опубликована: Май 27, 2019

Язык: Английский

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Tungsten oxide nanostructures and nanocomposites for photoelectrochemical water splitting

Nanoscale, Год журнала: 2019, Номер 11(41), С. 18968 - 18994

Опубликована: Янв. 1, 2019

This paper reviews nanostructural tungsten oxides and their nanocomposites to enhance the activity of photoelectrochemical water splitting.

Язык: Английский

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Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion

Chemical Reviews, Год журнала: 2021, Номер 121(17), С. 10271 - 10366

Опубликована: Июль 6, 2021

Global energy and environmental crises are among the most pressing challenges facing humankind. To overcome these challenges, recent years have seen an upsurge of interest in development production renewable chemical fuels as alternatives to nonrenewable high-polluting fossil fuels. Photocatalysis, photoelectrocatalysis, electrocatalysis provide promising avenues for sustainable conversion. Single- dual-component catalytic systems based on nanomaterials been intensively studied decades, but their intrinsic weaknesses hamper practical applications. Multicomponent nanomaterial-based systems, consisting three or more components with at least one component nanoscale, recently emerged. The multiple integrated together create synergistic effects hence limitation outperformance. Such higher-efficiency will potentially bring additional benefit balance-of-system costs if they exclude use noble metals, considering expense sustainability. It is therefore timely review research this field, providing guidance noble-metal-free multicomponent nanointegration In work, we first recall fundamentals catalysis by nanomaterials, nanointegration, reactor configuration water splitting, CO2 reduction, N2 reduction. We then systematically discuss advances multicomponent-based photocatalytic, photoelectrochemical, electrochemical nanomaterials. On basis further laterally evaluate different integration strategies highlight impacts activity, performance stability, product selectivity. Finally, conclusions future prospects nanointegration. This work offers comprehensive insights into cost-competitive energy-conversion technologies assists researchers working toward addressing global environment.

Язык: Английский

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Integrated Photorechargeable Energy Storage System: Next‐Generation Power Source Driving the Future

Advanced Energy Materials, Год журнала: 2020, Номер 10(14)

Опубликована: Фев. 18, 2020

Abstract Solar energy is one of the most abundant renewable sources. For efficient utilization solar energy, photovoltaic technology regarded as important source. However, due to intermittent and unstable characteristics radiation, photoelectric conversion (PC) devices fail meet requirements continuous power output. With development rechargeable electric storage systems (ESSs) (e.g., supercapacitors batteries), integration a PC device ESS has become promising approach solving this problem. The so‐called integrated photorechargeable ESSs which can directly store sunlight generated electricity in daylight reversibly release it at night time, huge potential for future applications. This review summarizes several types mainstream introduces different working mechanisms each detail. Several general perspectives on challenges field are also provided.

Язык: Английский

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