A simple flame strategy for constructing W‐doped BiVO4 photoanodes with enhanced photoelectrochemical water splitting,International Journal of Energy Research

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A simple flame strategy for constructing W‐doped BiVO4 photoanodes with enhanced photoelectrochemical water splitting
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-08-06 , DOI: 10.1002/er.5736
Yingchen Yang ₁ , Yong Zhao ₁ , Weiqiang Fan ₁ , Hao Shen ₁ , Weidong Shi ₁

Affiliation

Bismuth vanadate (BiVO₄) with narrow band gap has been widely reported in photoelectrochemical (PEC) water splitting. However, the low kinetic of water splitting is still the key for limiting the PEC performance of BiVO₄. Herein, a W‐doped BiVO₄ (W‐BVO) photoanode has been controllably prepared by a fast flame method within 40 seconds. The preparation condition including calcination time and quantity of W precursor has been systemically investigated, in order to optimize the PEC performance of W‐BVO. X‐ray photoelectron spectroscopy indicates that the introduction of W did not obviously cause the formation of oxygen vacancies, revealing that W has been doped into the crystal structure of BiVO₄ by flame method. The electrochemical impedance spectroscopy further confirmed that the W‐BVO possesses a lower charge transfer resistance with fast transfer ability of carriers. Based on the incident photon‐to‐electron conversion efficiency, the acceptable solar to electron conversion efficiency of 5.79% (340 nm, 1.23 V vs RHE) has been achieved in the W‐BVO system. A PEC mechanism has been proposed to demonstrate the promotion of kinetic for PEC water splitting. This work offers a promising alternative route for the design and fabrication of efficient photoanodes in other PEC systems.

中文翻译：

一种简单的火焰策略，用于构建掺W的BiVO4光阳极，并增强光电化学水分解能力

带隙窄的钒酸铋（BiVO ₄）在光电化学（PEC）水分解中得到了广泛报道。然而，低水分解动力学仍然是限制BiVO ₄的PEC性能的关键。本文中，通过快速火焰法在40秒内可控地制备了一个掺W的BiVO ₄（W-BVO）光电阳极。为了优化W-BVO的PEC性能，已经系统地研究了包括煅烧时间和W前驱体数量的制备条件。X射线光电子能谱表明，W的引入并未明显引起氧空位的形成，表明W已被掺杂到BiVO ₄的晶体结构中。通过火焰法。电化学阻抗谱进一步证实了W-BVO具有较低的电荷转移电阻和快速的载流子传输能力。基于入射光子-电子的转换效率，W-BVO系统已实现了5.79％的可接受的太阳-电子转换效率（340 nm，相对于RHE为1.23 V）。已经提出了PEC机理来证明促进PEC水分解的动力学。这项工作为其他PEC系统中高效光阳极的设计和制造提供了一种有希望的替代途径。

更新日期：2020-10-11

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