Unveiling the Activity and Stability Origin of BiVO4 Photoanodes with FeNi Oxyhydroxides for Oxygen Evolution.,Angewandte Chemie International Edition

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Unveiling the Activity and Stability Origin of BiVO4 Photoanodes with FeNi Oxyhydroxides for Oxygen Evolution.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-07-14 , DOI: 10.1002/anie.202008198
Beibei Zhang _{1,

2} , Xiaojuan Huang ₁ , Yan Zhang ₃ , Gongxuan Lu ₁ , Lingjun Chou ₁ , Yingpu Bi _{1,

4}

Affiliation

Understanding the origin of formation and active sites of oxygen evolution reaction (OER) cocatalysts is highly required for solar photoelectrochemical (PEC) devices that generate hydrogen efficiently from water. Herein, we employed a simple pH‐modulated method for in situ growth of FeNi oxyhydroxide ultrathin layers on BiVO₄ photoanodes, resulting in one of the highest currently known PEC activities of 5.8 mA cm⁻² (1.23 V_RHE, AM 1.5 G) accompanied with an excellent stability. More importantly, both comparative experiments and density functional theory (DFT) studies clearly reveal that the selective formation of Bi−O−Fe interfacial bonds mainly contributes the enhanced OER activities, while the construction of V−O−Ni interfacial bonds effectively restrains the dissolution of V⁵⁺ ions and promotes the OER stability. Thereby, the synergy between iron and nickel of FeNi oxyhydroxides significantly improved the PEC water oxidation properties of BiVO₄ photoanodes.

中文翻译：

用FeNi氢氧化物揭示BiVO4光电阳极的活性和稳定性起源。

能够从水中高效产生氢的太阳能光电化学（PEC）装置非常需要了解氧释放反应（OER）助催化剂的形成起点和活性部位。本文中，我们采用一种简单的pH调节方法在BiVO _4光阳极上原位生长FeNi羟基氧化超薄层，从而获得了目前已知的最高的PEC活性之一，为5.8 mA cm ^-2（1.23 V _RHE，AM 1.5 G）并具有出色的稳定性。更重要的是，比较实验和密度泛函理论（DFT）研究均清楚地表明，Bi-O-Fe界面键的选择性形成主要是增强了OER活性，而V-O-Ni界面键的构建有效地抑制了溶解V ⁵⁺离子的存在，并提高了OER的稳定性。因此，FeNi羟基氧化物的铁和镍之间的协同作用显着改善了BiVO _4光阳极的PEC水氧化性能。

更新日期：2020-07-14

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