Tungsten Trioxide Nanostructures for Photoelectrochemical Water Splitting: Material Engineering and Charge Carrier Dynamic Manipulation

Advanced Functional Materials, Год журнала: 2019, Номер 29(23)

Опубликована: Март 13, 2019

Abstract To address the energy crisis and environmental problems, applications of solar have received intensive attention. Converting to hydrogen using a photoelectrochemical (PEC) cell is one most promising approaches meet future demands. As an earth abundant metal oxide, tungsten trioxide (WO 3 ), which has moderate band gap (2.5–2.7 eV), ideal valence position, high resistance photocorrosion, been widely utilized in PEC photoanodes. obtain WO photoanode with efficiency, tremendous efforts made improve light absorption capacity, charge carrier dynamics, oxygen evolution activity. In this report, recent advances optimization, including morphology design, dopants doping, heterojunction fabrication, surface modification are summarized. review, these developments representative photoanodes unassisted water splitting devices also discussed. Finally, perspectives on significant challenges prospects for development provided.

Язык: Английский

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Light Management with Patterned Micro‐ and Nanostructure Arrays for Photocatalysis, Photovoltaics, and Optoelectronic and Optical Devices

Advanced Functional Materials, Год журнала: 2019, Номер 29(25)

Опубликована: Апрель 3, 2019

Abstract The design and fabrication of patterned micro‐ nanostructure arrays have been demonstrated to be a powerful strategy toward efficient light management, which is vital importance variety photon‐related applications such as photocatalysis, photovoltaics, optoelectronic devices, optical devices. Tunable reflectance, scattering, transmittance, absorption can readily achieved by adjusting the characteristics primary units in micro‐/nanoarrays spatial patterns aligned units, thus realizing controllable light–matter interactions. This review describes various management strategies based on micro‐/nanoarrays, scattering enhancement, antireflection, resonances, photonic crystals, plasmonic structures. Furthermore, recent advances photoelectrochemical water splitting, solar cells, photodetectors, emitting diodes, lasers, color display, microlens arrays, crystal sensors are summarized, with particular attention paid mechanisms relationship between structure device performance. Lastly, prospects existing challenges facing development discussed.

Язык: Английский

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Highly Efficient Photoelectrochemical Water Splitting from Hierarchical WO₃/BiVO₄ Nanoporous Sphere Arrays

Nano Letters, Год журнала: 2017, Номер 17(12), С. 8012 - 8017

Опубликована: Ноя. 29, 2017

Nanoarchitecture of bismuth vanadate (BiVO4) photoanodes for effectively increasing light harvesting efficiency and simultaneously achieving high charge separation is the key to approaching their theoretic performance solar-driven water splitting. Here, we developed hierarchical BiVO4 nanoporous sphere arrays, which are composed small nanoparticles sufficient voids offering capability separation. Significantly, multiple scattering in arrays along with large effective thickness photoanode induce efficient harvesting. In addition, attributed ultrathin two-dimensional Bi2WO6 nanosheets as precursor, synergy various enhancement strategies including WO3/BiVO4 nanojunction formation, W-doping, oxygen vacancy creation can be directly incorporated into such a unique architecture during one-step synthesis without complex pre- or post-treatment. The as-obtained exhibits splitting photocurrent 5.5 mA cm–2 at 1.23 V versus RHE under 1-sun illumination, among best values reported up-to-date field.

Язык: Английский

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Pseudomorphic Transformation of Interpenetrated Prussian Blue Analogs into Defective Nickel Iron Selenides for Enhanced Electrochemical and Photo‐Electrochemical Water Splitting

Advanced Energy Materials, Год журнала: 2018, Номер 9(1)

Опубликована: Ноя. 8, 2018

Abstract A significant methodology gap remains in the construction of advanced electrocatalysts, which has collaborative defective functionalities and structural coherence that maximizes electrochemical redox activity, electrical conductivity, mass transport characteristics. Here, a coordinative self‐templated pseudomorphic transformation an interpenetrated metal organic compound network is conceptualized into defect‐rich porous framework delivers highly reactive durable photo(electro)chemical energy conversion functionalities. The coordinative‐template approach enables previously inaccessible synthesis routes to rationally accomplish interconnected conductive at microscopic level, while exposing copious unsaturated sites atomic level without electronic or integrity trade‐offs. Consequently, framework, motifs, engineered defects endow remarkable electrocatalytic hydrogen evolution reaction oxygen activity due intrinsically improved turnover frequency, surface area, charge transfer. Moreover, when hybrid coupled with silicon photocathode for solar‐driven water splitting, it photon assisted reactions, separation, enhanced carrier via built‐in heterojunction additive co‐catalyst functionality, leading promising generation performance. This work signifies viable generic prepare other functional coordinated compounds, can be exploited diverse storage, conversion, environmental applications.

Язык: Английский

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Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

Advanced Science, Год журнала: 2018, Номер 6(2)

Опубликована: Ноя. 19, 2018

Abstract Photo‐electrochemical (PEC) water splitting, as an essential and indispensable research branch of solar energy applications, has achieved increasing attention in the past decades. Between two photoelectrodes, photoanodes for PEC oxidation are mostly studied facile selection n‐type semiconductors. Initially, efficiency process is rather limited, which mainly results from existing drawbacks such instability serious charge‐carrier recombination. To improve performances, researchers gradually focus on exploring many strategies, among engineering photoelectrodes with suitable cocatalysts one most feasible promising methods to lower reaction obstacles boost splitting ability. Here, basic principles, modules system, evaluation parameters reactions occurring surface photoanodes, functions promotion performance demonstrated. Then, key progress cocatalyst design construction applied oxygen evolution emphatically introduced influences different kinds elucidated detail. Finally, outlook highly active photosynthesis also included.

Язык: Английский

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