Abstract
A low-cost, highly efficient and strong durable bifunctional electrocatalyst is crucial for electrochemical overall water splitting. In this paper, a self-templated strategy combined with in-situ phosphorization is applied to construct hollow structured bimetallic cobalt-nickel phosphide (CoN-iPx) nanocages. Owing to their unique hollow structure and bimetallic synergistic effects, the as-synthesized CoNiPx hollow nanocages exhibit a high electrocatalytic activity and stability towards hydrogen evolution reaction in all-pH electrolyte and a remarkable electrochemical performance for oxygen evolution reaction in 1.0 mol L−1 KOH. Meanwhile, with the bifunctional electrocatalyst in both anode and cath ode for overall water splitting, a low voltage of 1.61 V and superior stability are achieved at a current density of 20 mA cm−2.
摘要
制备一种低成本、高效、稳定耐用的双功能电催化剂对于 电催化水分解至关重要. 本文采用自模板策略和原位磷化工艺相 结合的方法构建了一种具有中空结构的钴镍双金属磷化物纳米笼 (CoNiPx) 由于其独特的中空结构和钴镍双金属之间的协同效应, 合成的 CoNiPx 中空纳米笼催化剂在全pH值范围的电解质中对析氢 反应均表现出优异的电催化活性和稳定性, 并在1.0 mol L−1 氢氧化 钾(KOH)中对析氧反应也表现出很好的电化学性能. CoNiPx 中空 纳米笼作为阳极和阴极的双功能催化剂也显示出了优异的全解水 性能, 在20mA cm−2 电流密度下, 电压值为1.61 V, 且稳定性良好.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2017YFA 0208300 and 0700104), the National Natural Science Foundation of China (21671180) and the State Key Laboratory of Organic Inorganic Composites (oic-201801007).
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Yu ZQ and Wu Y designed the materials; Wang Z and Yang J performed the experiments; Wang W and Zhou F helped to analyze the data; Zhou H, Xue Z and Xiong C modified the manuscript; All authors contributed to the general discussion.
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Experimental details and supporting data are available in the online version of the paper.
Zhiyuan Wang obtained his PhD in physical chemistry at RWTH Aachen University, Germany, in 2018. He then carried out postdoctoral research with Prof. Yuen Wu at iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China. His research focuses on the synthesis of nanomaterials and their applications in photocatalysis and electrocatalysis.
Yuen Wu received his BSc and PhD degrees from the Department of Chemistry, Tsinghua University in 2009 and 2014, respectively. He is currently a professor in the Department of Chemistry, University of Science and Technology of China. His research interests are focused on the synthesis, assembly, characterization and application exploration of functional nanomaterials.
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Wang, Z., Yang, J., Wang, W. et al. Hollow cobalt-nickel phosphide nanocages for efficient electrochemical overall water splitting. Sci. China Mater. 64, 861–869 (2021). https://doi.org/10.1007/s40843-020-1475-2
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DOI: https://doi.org/10.1007/s40843-020-1475-2