Coupling multifunctional ZnCoAl-layered double hydroxides on Ti-Fe₂O₃ photoanode for efficient photoelectrochemical water oxidation.

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL ACS Catalysis Pub Date : 2025-02-01 Epub Date: 2024-10-10 DOI:10.1016/j.jcis.2024.10.036

Haiyang Cheng, Kaikai Ba, Yunan Liu, Yanhong Lin, Dejun Wang, Tengfeng Xie

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Abstract

The efficiency of photoelectrochemical (PEC) water splitting is hindered by the slow kinetics of the oxygen evolution reaction (OER). This study developed a composite photoanode for water oxidation by incorporating ternary LDHs (ZnCoAl-LDH) onto Ti-Fe₂O₃ as a cocatalyst. The ZnCoAl-LDH/Ti-Fe₂O₃ photoanode achieved a photocurrent density of 3.51 mA/cm² at 1.23 V vs. RHE, which is 9.8 times higher than that of bare Ti-Fe₂O₃. Through a series of characterizations, the synergistic effects among the three metals were revealed. Furthermore, the addition of Zn can induce the formation of more high-valent Co, increasing the conductivity of CoAl-LDH and significantly reducing the surface charge transfer resistance. These advantages significantly enhance the injection efficiency of ZnCoAl-LDH/Ti-Fe₂O₃ (82 %), thereby accelerating the OER kinetics of Ti-Fe₂O₃. Our work introduces new approaches for selecting photoelectrochemical cocatalysts and designing high-performance photoanodes for water splitting.

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在 Ti-Fe2O3 光阳极上耦合多功能 ZnCoAl 层状双氢氧化物，实现高效光电化学水氧化。

光电化学（PEC）水分离的效率因氧进化反应（OER）的缓慢动力学而受到阻碍。本研究通过将三元 LDHs（ZnCoAl-LDH）结合到作为协同催化剂的 Ti-Fe2O3 上，开发了一种用于水氧化的复合光阳极。ZnCoAl-LDH/Ti-Fe2O3 光阳极在 1.23 V 对比 RHE 时的光电流密度达到 3.51 mA/cm2，是裸 Ti-Fe2O3 的 9.8 倍。通过一系列表征，三种金属之间的协同效应得以显现。此外，Zn 的加入能诱导形成更多的高价 Co，从而提高 CoAl-LDH 的电导率，并显著降低表面电荷转移电阻。这些优势大大提高了 ZnCoAl-LDH/Ti-Fe2O3 的注入效率（82%），从而加速了 Ti-Fe2O3 的 OER 动力学。我们的工作为选择光电化学协同催化剂和设计用于水分离的高性能光阳极引入了新方法。

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来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.