二维铋作为 BiVO4 和 NiFeOOH 之间的功能层，用于增强放氧光电阳极,Advanced Functional Materials

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二维铋作为 BiVO4 和 NiFeOOH 之间的功能层，用于增强放氧光电阳极
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-09-04 , DOI: 10.1002/adfm.202207136
Junyi Cui ₁ , Matyas Daboczi ₁ , Miriam Regue ₁ , Yi‐Chun Chin ₂ , Katia Pagano ₂ , Jifang Zhang ₃ , Mark A. Isaacs ₄ , Gwilherm Kerherve ₅ , Aris Mornto ₁ , James West ₁ , Sixto Gimenez ₆ , Ji‐Seon Kim ₂ , Salvador Eslava ₁

Affiliation

BiVO ₄在水分解光电化学装置中的析氧光阳极引起了广泛关注。然而，其性能受到表面态电子-空穴复合的阻碍。在此，部分氧化的二维 (2D) 铋被开发为 BiVO ₄和原型 NiFeOOH 助催化剂之间的有效、稳定、功能性中间层。_{综合（光）电化学和表面光电压表征表明，NiFeOOH可以通过钝化BiVO 4}的空穴陷阱态来有效延长光生空穴的寿命；_{然而，它在影响与氧空位(}VO )相关的电子陷阱状态方面受到限制。在 BiVO _{4上加载铋}光阳极通过在表面形成基于氧/羟基的水氧化中间体来增加有利于析氧反应的_V2O的密度。此外，铋增加了界面带弯曲并填充了与V _O相关的电子陷阱，从而导致更有效的电荷提取。由于铋和 NiFeOOH 在 BiVO _{4上的协同作用，与裸 BiVO}₄相比，这种复合光阳极的光电流增加了 5.8 倍，在+0.8 V _RHE的低偏压下达到稳定的 3.4 (±0.2) mA cm ^–2或+1.23 V _RHE时为4.7(±0.2) mA cm ^–2. 使用二维铋作为功能性中间层为提高光电阳极的性能提供了一种新策略。

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2D Bismuthene as a Functional Interlayer between BiVO4 and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes

BiVO₄ has attracted wide attention for oxygen-evolution photoanodes in water-splitting photoelectrochemical devices. However, its performance is hampered by electron-hole recombination at surface states. Herein, partially oxidized two-dimensional (2D) bismuthene is developed as an effective, stable, functional interlayer between BiVO₄ and the archetypal NiFeOOH co-catalyst. Comprehensive (photo)electrochemical and surface photovoltage characterizations show that NiFeOOH can effectively increase the lifetime of photogenerated holes by passivating hole trap states of BiVO₄; however, it is limited in influencing electron trap states related to oxygen vacancies (V_O). Loading bismuthene on BiVO₄ photoanodes increases the density of V_O that are beneficial for the oxygen evolution reaction via the formation of oxy/hydroxyl-based water oxidation intermediates at the surface. Moreover, bismuthene increases interfacial band bending and fills the V_O-related electron traps, leading to more efficient charge extraction. With the synergistic interaction of bismuthene and NiFeOOH on BiVO₄, this composite photoanode achieves a 5.8-fold increase in photocurrent compared to bare BiVO₄ reaching a stable 3.4 (±0.2) mA cm^–2 at a low bias of +0.8 V_RHE or 4.7(±0.2) mA cm^–2 at +1.23 V_RHE. The use of 2D bismuthene as functional interlayer provides a new strategy to enhance the performance of photoanodes.

更新日期：2022-09-04

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