Efficient Oxygen Evolution Reaction on Polyethylene Glycol-Modified BiVO4 Photoanode by Speeding up Proton Transfer,Small

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Efficient Oxygen Evolution Reaction on Polyethylene Glycol-Modified BiVO4 Photoanode by Speeding up Proton Transfer
Small ( IF 13.0 ) Pub Date : 2022-06-16 , DOI: 10.1002/smll.202201410
Yuqiong Deng ₁ , Xionghui Fu ₁ , Yuanming Zhang ₁ , Yi Zhu _{1,

2} , Yongge Wei ₃

Affiliation

The rate-determining step of the oxygen evolution reaction based on a semiconductor photoanode is the formation of the OO bond. Herein, polyethylene glycol (PEG)-modified BiVO₄ photoanodes are reported, in which protons can be transferred quickly due to the high proton conductivity of PEG, resulting in the acceleration of the OO bond formation rate. These are fully demonstrated by different kinetic isotope effect values. Moreover, the open-circuit voltage (U_oc) further illustrates that PEG passivates the surface states and surface charge recombination is reduced. The composite photoanode can achieve a maximum photocurrent density of 3.64 mA cm⁻² at 1.23 V compared to 1.04 mA cm⁻² for pure BiVO₄, and an onset potential of 170 mV, which is a 230 mV negative shift compared to pure BiVO₄. This work provides a new strategy to accelerate water oxidation kinetics for photoanodes by speeding up the transfer of the proton and the OO bond formation rate.

中文翻译：

聚乙二醇修饰的 BiVO4 光阳极通过加速质子转移的高效析氧反应

基于半导体光阳极的析氧反应的速率决定步骤是O O 键的形成。本文报道了聚乙二醇 (PEG) 修饰的 BiVO ₄光阳极，由于 PEG 的高质子电导率，质子可以快速转移，从而加快了O O 键的形成速率。不同的动力学同位素效应值充分证明了这些。此外，开路电压（U _oc）进一步说明了PEG钝化了表面态并且减少了表面电荷复合。^{与 1.04 mA cm -2}相比，复合光阳极在 1.23 V 时可实现 3.64 mA cm ^{-2的最大光电流密度}对于纯BiVO _{4 ，起始电位为170 mV，与纯BiVO}₄相比，负偏移为230 mV 。这项工作提供了一种新的策略，通过加快质子的转移和OO键的形成速率来加速光阳极的水氧化动力学。

更新日期：2022-06-16

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