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Coupling interface constructions of FeOOH/NiCo2S4 by microwave-assisted method for efficient oxygen evolution reaction

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Abstract

The oxygen evolution reaction (OER) with slow kinetics is the rate-limiting step of electrochemical water splitting. A reasonable construction of interface nanostructures is the key to improving the OER efficiency and durability of non-noble metal electrocatalysts. In this study, a FeOOH/NiCo2S4 core–shell nanorod array with abundant heterogeneous interfaces and high density of active sites was successfully prepared by a microwave-assisted method. Experimental research and theoretical calculations show that the abundant strong coupling Ni/Co–S–Fe interface helps in adjusting the electronic structure of the material surface, optimizing the adsorption energy of the intermediate, and realizing an efficient catalytic process. The as-synthesized FeOOH/NiCo2S4/NF composite electrode exhibited lower overpotential (198 mV) and Tafel slope (62 mV·dec−1) at a current density of 10 mA·cm−2 and excellent stability (approximately 100% retention after 100 h) than the NiCo2S4/nickel foam (NF). In conclusion, constructing heterojunctions with complementary active materials is an effective strategy to design efficient and robust OER electrocatalysts.

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摘要

动力学缓慢的析氧反应(OER)是电化学分解水的限速步骤。合理构建纳米界面结构是提高非贵金属电催化剂析氧 反应效率和耐久性的关键。本研究采用微波辅助法制备了具有丰富异构界面和高密度活性位点的 FeOOH/NiCo2S4 核壳纳米棒阵列。实验研究和理论计算表明，丰富的强耦合Ni/Co-S-Fe 界面有助于调节材料表 面的电子结构，优化中间体的吸附能，实现高效的催化过程。与 NiCo2S4/NF相比，合成 FeOOH/NiCo2S4/NF复合电极在电流密度为10 mA·cm−2 时表现出较低的过电位(198 mV)和塔菲尔斜率(62 mV·dec−1), 且具有良好的 稳定性(100 h 后活性保持率接近100%)。研究表明，利用具有互补优势的活性材料构建异质界面是设计高效、稳 定的OER 电催化剂的有效策略。

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Acknowledgements

This study was financially supported by Hainan Province Clinical Medical Center, the National Natural Science Foundation of China (Nos. 81860373, 51862006, 81902154 and 82060386) and Hainan Province Science and Technology Special Fund (Nos. ZDKJ2021029 and ZDYF2021SHFZ068).

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  1. Ming-Liang Guo and Zhi-Yu Wu have contributed equally to this work.

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  1. State Key Laboratory of Marine Resource Utilization in the South China Sea, College of Materials Science and Engineering, Hainan University, Haikou, 570228, China

    Ming-Liang Guo, Zhi-Yu Wu, Miao-Miao Zhang, Zi-Jian Huang, Ke-Xi Zhang, Bing-Rong Wang & Jin-Chun Tu

  2. School of Science, Hainan University, Haikou, 570228, China

    Zhi-Yu Wu

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Guo, ML., Wu, ZY., Zhang, MM. et al. Coupling interface constructions of FeOOH/NiCo2S4 by microwave-assisted method for efficient oxygen evolution reaction. Rare Met. 42, 1847–1857 (2023). https://doi.org/10.1007/s12598-022-02239-z

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