Unveiling the multiple effects of MOF-derived TiO2 on Ti-Fe2O3 photoanodes for efficient and stable photoelectrochemical water oxidation

IF 15.7 1区化学 Q1 CHEMISTRY, APPLIED

Chinese Journal of Catalysis Pub Date : 2024-06-01 DOI:10.1016/S1872-2067(24)60005-7

Kaikai Ba , Yuʼnan Liu , Kai Zhang , Ping Wang , Yanhong Lin , Dejun Wang , Ziheng Li , Tengfeng Xie

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引用次数: 0

Abstract

α-Fe₂O₃ is a promising photoanode that is limited by its high surface charge recombination and slow water oxidation kinetics. In this study, we synthesized a TiO₂ layer on Ti-Fe₂O₃ by annealing Ti-MOFs, followed by ZIF-67 as a co-catalyst, to fabricate a ZIF-67/TiO₂/Ti-Fe₂O₃ photoanode for photoelectrochemical (PEC) water splitting. The systematic experimental and theoretical results revealed that the improvement in performance was due to multiple effects of the MOF-derived TiO₂. This molecule not only passivates the acceptor surface states of Ti-Fe₂O₃, thereby reducing the number of surface recombination centers, but also acts as an electron barrier to promote charge separation in the Ti-Fe₂O₃ bulk. Moreover, MOF-derived TiO₂ can dramatically reduce the energy barrier for the OER of Ti-Fe₂O₃, thus promoting the conversion of the intermediate *OH into *O. The synergistic improvement in the bulk and surface properties effectively enhanced the water oxidation performance of Ti-Fe₂O₃. The ZIF-67/TiO₂/Ti-Fe₂O₃ photoanode exhibits a photocurrent density of up to 4.04 mA cm⁻² at 1.23 V vs. RHE, which is 9.4 times as that of pure Ti-Fe₂O₃, and has long-term stability. Our work provides a feasible strategy for constructing efficient organic-inorganic hybrid photoelectrodes.

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揭示 MOF 衍生 TiO2 对 Ti-Fe2O3 光阳极的多重影响，实现高效稳定的光电化学水氧化作用

α-Fe2O3是一种很有前途的光阳极，但其表面电荷重组率高、水氧化动力学缓慢，这限制了它的发展。在本研究中，我们通过退火 Ti-MOFs 在 Ti-Fe2O3 上合成了 TiO2 层，然后以 ZIF-67 作为助催化剂，制备了 ZIF-67/TiO2/Ti-Fe2O3 光阳极，用于光电化学（PEC）分水。系统的实验和理论结果表明，性能的提高是由于 MOF 衍生 TiO2 的多重效应。这种分子不仅钝化了 Ti-Fe2O3 的受体表面态，从而减少了表面重组中心的数量，而且还起到了电子屏障的作用，促进了 Ti-Fe2O3 体中的电荷分离。此外，MOF 衍生的 TiO2 还能显著降低 Ti-Fe2O3 的 OER 能垒，从而促进中间体 *OH 向 *O 的转化。块体和表面性质的协同改善有效提高了 Ti-Fe2O3 的水氧化性能。ZIF-67/TiO2/Ti-Fe2O3 光阳极在 1.23 V 对 RHE 时的光电流密度高达 4.04 mA cm-2，是纯 Ti-Fe2O3 的 9.4 倍，并且具有长期稳定性。我们的工作为构建高效的有机-无机杂化光电极提供了一种可行的策略。

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来源期刊

Chinese Journal of Catalysis 工程技术-工程：化工

CiteScore

25.80

自引率

10.30%

发文量

235

审稿时长

1.2 months

期刊介绍： The journal covers a broad scope, encompassing new trends in catalysis for applications in energy production, environmental protection, and the preparation of materials, petroleum chemicals, and fine chemicals. It explores the scientific foundation for preparing and activating catalysts of commercial interest, emphasizing representative models.The focus includes spectroscopic methods for structural characterization, especially in situ techniques, as well as new theoretical methods with practical impact in catalysis and catalytic reactions.The journal delves into the relationship between homogeneous and heterogeneous catalysis and includes theoretical studies on the structure and reactivity of catalysts.Additionally, contributions on photocatalysis, biocatalysis, surface science, and catalysis-related chemical kinetics are welcomed.