Energy Transfer‐Induced Photoelectrochemical Improvement from Porous Zeolitic Imidazolate Framework‐Decorated BiVO4 Photoelectrodes,Small Methods

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Energy Transfer‐Induced Photoelectrochemical Improvement from Porous Zeolitic Imidazolate Framework‐Decorated BiVO4 Photoelectrodes
Small Methods ( IF 10.7 ) Pub Date : 2020-11-17 , DOI: 10.1002/smtd.202000753
Cheol Hyoun Ahn _{1,

2} , Nishad G Deshpande _{1,

2} , Ho Seong Lee ₃ , Hyung Koun Cho _{1,

2}

Affiliation

BiVO₄, which is a representative photoanode material for photoelectrochemical water splitting, intrinsically restricts high conversion efficiency, owing to faster recombination, low electron mobility, and short electron diffusion length. While the photocurrent density of typical BiVO₄ corresponds to only 21.3% of the maximum photocurrent density (4.68 mA cm⁻²), decoration of the BiVO₄ photoanode with zeolitic imidazolate framework‐67 (ZIF‐67) exhibits a synergetic effect to raise the overall photocatalytic ability at the BiVO₄ surface region to a higher level via the energy‐transfer process from BiVO₄ to ZIF‐67. The hybrid ZIF‐67/BiVO₄ photoanode follows two convenient photoelectrochemical pathways: 1) energy‐transfer‐induced water oxidation reaction in ZIF‐67 and 2) water oxidation reaction by direct contact between the BiVO₄ surface and electrolytes. Compared to the moderate photocurrent density (≈1 mA cm⁻²) of single‐layer BiVO₄, the proposed ZIF‐67/BiVO₄ photoanodes show a remarkably high photocurrent (2.25 mA cm⁻²) with high stability, despite the lack of hole scavengers in the electrolyte. Furthermore, the absorbed photon‐to‐current efficiency of the ZIF‐67/BiVO₄ photoanode is ≈2.5 times greater than that of BiVO₄. This work proposes a promising solution for efficient water oxidation that overcomes the intrinsic material limitations of BiVO₄ photoelectrodes by using energy transfer‐induced photon recycling and the decoration of porous ZIFs.

中文翻译：

多孔沸石咪唑酯骨架修饰的 BiVO4 光电极的能量转移诱导光电化学改进

BiVO ₄是一种具有代表性的光电化学水分解光阳极材料，由于复合速度快、电子迁移率低和电子扩散长度短，从本质上限制了高转换效率。虽然典型 BiVO ₄的光电流密度仅对应于最大光电流密度 (4.68 mA cm ^-2 ) 的21.3%，但用沸石咪唑酯骨架-67 (ZIF-67)装饰 BiVO _{4 光}阳极表现出协同效应以提高在BiVO总体光催化能力₄表面区域通过从BiVO能量传递过程更高级别₄到ZIF-67。杂化 ZIF-67/BiVO ₄光阳极遵循两种方便的光电化学途径：1）ZIF-67 中能量转移诱导的水氧化反应和 2）BiVO ₄表面与电解质直接接触的水氧化反应。相较于中等光电流密度（≈ 1毫安厘米^-2单层的）BiVO ₄，所提出的ZIF-67 / BiVO _4个光阳极显示出显着高的光电流（2.25毫安厘米^-2）具有高稳定性，尽管缺乏电解液中的空穴清除剂。此外，所吸收的光子-电流的效率ZIF-67 / BiVO ₄光电阳极是≈比BiVO的2.5倍的₄. 这项工作提出了一种有效的水氧化解决方案，通过使用能量转移诱导的光子循环和多孔 ZIF 的装饰，克服了 BiVO ₄光电极的固有材料限制。

更新日期：2020-11-17

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