Haoran Gao, Zhikun Xu, Shuangyan Lin, Yujing Sun, Lin Li
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引用次数: 0
摘要
合理构建用于氧进化反应（OER）的高效电催化剂在能源转换系统中发挥着至关重要的作用。设计异质结构是提高电催化剂性能的一种常见而有效的策略。本文采用一步硫化法在泡沫镍上合成了 MnS2/Co4S3/Ni3S2 异质结构。它提供了改良的电子结构和丰富的三相异质界面，能有效地丰富活性位点并加速电子传递，从而提高 OER 活性。得益于这种异质结构，MnS2/Co4S3/Ni3S2 的过电位分别为 265 和 304 mV，OER 的电流密度分别达到 50 和 100 mA/cm2。此外，还研究了 MnS2/Co4S3/Ni3S2 的表面重构，发现在 OER 过程中形成了金属氢（氧）氧化物。这项工作提供了一种构建三相异质结构的简便策略，为开发高性能、非贵金属基 OER 电催化剂提供了启示。
Construction of a Three-Phase MnS2/Co4S3/Ni3S2 Heterostructure for Boosting Oxygen Evolution.
The rational construction of highly efficient electrocatalysts for the oxygen evolution reaction (OER) plays a critical role in energy conversion systems. Designing heterostructures is a common and effective strategy to improve the performance of electrocatalysts. In this paper, an MnS2/Co4S3/Ni3S2 heterostructure was synthesized on Ni foam using a one-step vulcanization method. It provides a modified electronic structure and plentiful three-phase heterogeneous interfaces that can effectively enrich the active sites and accelerate electron transfer, thereby improving the OER activity. Thanks to the heterostructure, the MnS2/Co4S3/Ni3S2 exhibits a low overpotential of 265 and 304 mV for the OER to reach current densities of 50 and 100 mA/cm2, respectively. Furthermore, the surface reconstruction of MnS2/Co4S3/Ni3S2 has been investigated, which revealed the formation of metal hydr(oxy)oxides evolved during the OER process. This work provides a facile strategy for constructing three-phase heterostructures, shedding light on the development of high-performance, nonprecious metal-based OER electrocatalysts.
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