Freeing the Polarons to Facilitate Charge Transport in BiVO<sub>4</sub> from Oxygen Vacancies with an Oxidative 2D Precursor

Qiu, Weitao; Xiao, Shuang; Ke, Jingwen; Wang, Zheng; Tang, Songtao; Zhang, Kai; Qian, Wei; Huang, Yongchao; Huang, Dongwei; Tong, Yexiang; Yang, Shihe

doi:10.1002/ange.201912475

Cited by 26 publications

(16 citation statements)

References 68 publications

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“…In this concern, Qiu et al established an internal oxidant route for the synthesis of nanoporous BiVO 4 photoanode by which polaron hopping obstacles are minimized causing a sudden increase in electron mobility. [107] The O v fix the polaron and hinder its transport through BiVO 4 , which resulted in photocurrent density of 4.8 mA cm −2 at 1.23 V RHE and the η sep of ≈91%.…”

Section: Defect Engineeringmentioning

confidence: 99%

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Gaikwad

Suryawanshi

Ghorpade

et al. 2021

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107

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Therefore, an ever-growing demand for sustainable and environmentally-friendly energy technologies are prompting scientists to explore alternative approaches to reduce the carbon footprint. [2] Among the different sustainable energy sources, solar energy is an inexhaustible source of energy (173000 Terawatt (TW), almost 10 000 times of 17.7 TW, global energy consumption in 2020) and the largest currently available on earth with a ubiquitous distribution worldwide. [3] However, its decentralized and intermittent nature poses a great challenge to our energy needs. [4] Artificial photosynthesis, imitating a natural photosynthesis, where the harvesting of sunlight directly into chemical bonds (hydrogen, (H 2 ) fuel) is a highly promising approach to address the serious issue like air pollution, greenhouse gas emission, etc. Artificial photosynthesis by means of photoelectrochemical (PEC) water splitting has been studied extensively to split water using sunlight and semiconductor into oxygen (O 2 ) and H 2 , where the generated H 2 can be stored and transported to other energy conversion systems. [5] In recent years, PEC water splitting turned out to be an elegant and ecological way to generate clean H 2 fuel. Despite having mature and commercialized technologies, photovoltaic-electrochemical (PV-EC) water splitting systems have the most significant complications in PV designs. [6] In a photocatalytic (PC) water splitting system, on the other hand, both H 2 and O 2 are generated on the same surface of the PC particles, and hence in most cases, backward complex reactions like hydrogen oxidation reaction and oxygen reduction reaction occur quickly, lowering the solar to H 2 (STH) conversion efficiency. [7] In comparison to the PC system, the physical separation of oxidation and reduction species in PEC cells makes them more practical, effective, and safer. Moreover, the PEC cells have an electrode/electrolyte interface that performs simultaneous roles of light-harvesting and electrolysis in a single reactor. Consequently, the large-scale application of PEC cells is the most achievable, even at lower operating temperature as it opens up the opportunity to improve efficiency and reduce costs through the nature of its device structure. In particular, a recent assessment of its practicability has shown that the lifespan (i.e., stability), efficiency, and capital cost of The photoelectrochemical (PEC) cell that collects and stores abundant sunlight to hydrogen fuel promises a clean and renewable pathway for future energy needs and challenges. Monoclinic bismuth vanadate (BiVO 4 ), having an earthabundancy, nontoxicity, suitable optical absorption, and an ideal n-type band position, has been in the limelight for decades. BiVO 4 is a potential photoanode candidate due to its favorable outstanding features like moderate bandgap, visible light activity, better chemical stability, and cost-effective synthesis methods. However, BiVO 4 suffers from rapid recombination of photogenerated charge carriers that have impeded further imp...

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Section: Defect Engineeringmentioning

confidence: 99%

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Gaikwad

Suryawanshi

Ghorpade

et al. 2021

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107

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“…As an example, a recent study showed the suppression of the formation of oxygen vacancies leading to a higher PEC performance due to an increase of the conductivity as a consequence of the release of bound polarons. 61 The synthesis of black BiVO 4 has been reported, as a new black material. 63 Herein, nanosized black BiVO 4 colloids were prepared by laser irradiation of bulk particles.…”

Section: Bismuth Vanadate Bivomentioning

confidence: 99%

The role of oxygen vacancies in water splitting photoanodes

Fernández‐Climent

Giménez

García‐Tecedor

2020

Sustainable Energy Fuels

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“…This in turn results in an increase in the amount of oxygen vacancies in BiVO 4 samples to maintain charge neutrality. , The incomplete oxidation of vanadium can be unintentional, but it is also a common strategy for improving the efficiency of photoanodes based on BiVO 4 . ,− ,− However, the role of oxygen vacancies in BiVO 4 is not entirely without controversy. It has been reported both that they enhance and diminish the charge transfer properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Influence of Oxygen Vacancies on the Structure of BiVO₄

Österbacka

Wiktor

2021

J. Phys. Chem. C

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We study oxygen vacancies in the tetragonal scheelite phase of bismuth vanadate and identify stable oxygen-deficient structures. Upon subjecting these to variable-cell optimization, we find that oxygen vacancies give rise to significant structural distortions, the degree of which exhibits a vacancy concentration dependence. Furthermore, we show that these distortions give rise to splitting of powder X-ray diffraction peaks, yielding patterns similar to that of the monoclinic scheelite phase, and that these effects are also present at finite temperatures. Our results highlight the need for characterization methods beyond X-ray diffraction for identifying the phase of synthesized bismuth vanadate samples and the importance of oxygen partial pressure control during synthesis.

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Freeing the Polarons to Facilitate Charge Transport in BiVO₄ from Oxygen Vacancies with an Oxidative 2D Precursor

Cited by 26 publications

References 68 publications

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

The role of oxygen vacancies in water splitting photoanodes

Influence of Oxygen Vacancies on the Structure of BiVO₄

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Freeing the Polarons to Facilitate Charge Transport in BiVO4 from Oxygen Vacancies with an Oxidative 2D Precursor

Cited by 26 publications

References 68 publications

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO4 for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO4 for Photoelectrochemical Water Splitting

The role of oxygen vacancies in water splitting photoanodes

Influence of Oxygen Vacancies on the Structure of BiVO4

Contact Info

Product

Resources

About

Freeing the Polarons to Facilitate Charge Transport in BiVO₄ from Oxygen Vacancies with an Oxidative 2D Precursor

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Emerging Surface, Bulk, and Interface Engineering Strategies on BiVO₄ for Photoelectrochemical Water Splitting

Influence of Oxygen Vacancies on the Structure of BiVO₄