Abstract
Hydrogen, as a green and clean next-generation fuel, is a key to achieving the goal of carbon neutrality. Constructing an electrocatalyst with bifunctional hydrogen evolution and oxygen evolution activity in the same electrolyte is a key technology for producing hydrogen via water splitting. Herein, a bimetallic active site catalyst, which possessed an edge-riched MoS2 nanoflakes array vertically growing on cubic CoS2, forming a nuclear-shell heterogeneous configuration, termed CSC-MoS2@CoS2. was reported The optimal CSC-MoS2@CoS2-24 possessed good dual-functional electrocatalytic activity (hydrogen evolution (HER), 10 mA·cm−2@241.5 mV and oxygen evolution (OER), 10 mA·cm−2@350 mV). Especially, CSC-MoS2@CoS2-24 exhibited an extremely high mass activity for HER, and only required an overpotential of ~ 550 mV when reaching a large current density of 1422 mA·mg−1, which was 20.6-fold that of the bulk CoS2 (69 mA·mg−1), as well as exhibiting stability of up to 100 h. The good electrocatalytic performance was attributed to the nuclear-shell heterostructure of MoS2@CoS2 hybrid could bring critical synergies, improving efficient mass transfer and electron transfer processes between CoS2 and MoS2, which collaboratively promoted the electrocatalytic kinetics. It is foreseeable that the method proposed in this work will have guiding value for the preparation of dual-functional electrocatalysts with multi-interface heterostructures by assembling layered sulfides on cubic sulfides.
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摘要
氢气作为绿色清洁的次世代燃料,是实现碳中和目标的关键。在同一电解质中构建具有析氢和析氧双功能的电催化剂是水分解制氢的关键所在。在此,我们制备了一种双金属活性位点催化剂,它在立方形CoS2上垂直生长了边缘丰富的MoS2纳米片阵列,形成核-壳异质构型,记作 CSC-MoS2@CoS2。其中最佳的CSC-MoS2@CoS2-24催化剂具有良好的双功能电催化活性(HER,10 mA·cm-2@241.5 mV)和(OER,10 mA·cm-2@350 mV)。而且CSC-MoS2@CoS2-24 表现出极高的 HER 质量比活性,在达到 1422 mA·mg-1 的大电流密度时仅需要~550 mV 的过电位,是体相CoS2 (69 mA·mg-1)的20.6倍。以及表现出长达 100 h的稳定性。良好的电催化性能归因于 MoS2@CoS2杂化物的核壳异质结构可以带来关键的协同作用,改善CoS2和 MoS2之间的有效传质和电子转移过程,协同促进了电催化动力学。可以预见,该文章提出的策略将对通过在立方硫化物上组装层状硫化物得到具有多界面异质结构的双功能电催化剂提供有益指导。
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Acknowledgements
This study was financially supported by the National Science Foundation of China (Nos. 52203314, 52071226 and 51872193), the Natural Science Foundations of Jiangsu Province (No. BK20210847), Jiangsu Key Laboratory for Biomass Energy and Material (No. JSBEM-S-201805) and the Natural Science Foundations of the Jiangsu Higher Education Institutions of China (No. 21KJB430042). Yu-Feng Cao and Qin-Min Pan are very grateful to Professor Garry Rempel for his guidance and support in our scientific research during his lifetime.
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Cheng, Y., Zhou, X., Pan, QM. et al. Bimetallic active site nuclear-shell heterostructure enables efficient dual-functional electrocatalysis in alkaline media. Rare Met. 42, 3024–3033 (2023). https://doi.org/10.1007/s12598-023-02300-5
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DOI: https://doi.org/10.1007/s12598-023-02300-5