Liao Liling, Sun Jingying, Li Dongyang, Yu Fang, Zhu Yijun, Yang Yi, Wang Jinjian, Zhou Weichang, Tang Dongsheng, Chen Shuo, Zhou Haiqing
Synergetic Innovation Center for Quantum Effects and Applications, Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, School of Physics and Electronics, Hunan Normal University, Changsha, 410081, Hunan, China.
Key Laboratory for Matter Microstructure and Function of Hunan Province, Hunan Normal University, Changsha, 410081, Hunan, China.
Small. 2020 Apr;16(13):e1906629. doi: 10.1002/smll.201906629. Epub 2020 Mar 4.
Developing efficient non-noble and earth-abundant hydrogen-evolving electrocatalysts is highly desirable for improving the energy efficiency of water splitting in base. Molybdenum disulfide (MoS ) is a promising candidate, but its catalytic activity is kinetically retarded in alkaline media due to the unfavorable water adsorption and dissociation feature. A heterogeneous electrocatalyst is reported that is constructed by selenium-doped MoS (Se-MoS ) particles on 3D interwoven cobalt diselenide (CoSe ) nanowire arrays that drives the hydrogen evolution reaction (HER) with fast reaction kinetics in base. The resultant Se-MoS /CoSe hybrid exhibits an outstanding catalytic HER performance with extremely low overpotentials of 30 and 93 mV at 10 and 100 mA cm in base, respectively, which outperforms most of the inexpensive alkaline HER catalysts, and is among the best alkaline catalytic activity reported so far. Moreover, this hybrid catalyst shows exceptional catalytic performance with very low overpotentials of 84 and 95 mV at 10 mA cm in acidic and neutral electrolytes, respectively, implying robust pH universality of this hybrid catalyst. This work may provide new inspirations for the development of high-performance MoS -based HER electrocatalysts in unfavorable basic media for promising catalytic applications.
开发高效的非贵金属且储量丰富的析氢电催化剂对于提高碱性条件下水分解的能量效率非常有必要。二硫化钼（MoS₂）是一种很有前景的候选材料，但其催化活性在碱性介质中因不利的水吸附和解离特性而受到动力学阻碍。据报道，一种非均相电催化剂由三维交织的二硒化钴（CoSe₂）纳米线阵列上的硒掺杂二硫化钼（Se-MoS₂）颗粒构成，该催化剂在碱性条件下能以快速的反应动力学驱动析氢反应（HER）。所得的Se-MoS₂/CoSe₂复合材料在碱性条件下分别在10和100 mA cm⁻²时表现出出色的催化HER性能，过电位极低，分别为30和93 mV，优于大多数廉价的碱性HER催化剂，并且是迄今为止报道的最佳碱性催化活性之一。此外，这种复合催化剂在酸性和中性电解质中分别在10 mA cm⁻²时表现出极低的过电位，分别为84和95 mV，具有出色的催化性能，这意味着这种复合催化剂具有强大的pH通用性。这项工作可能为在不利的碱性介质中开发用于有前景催化应用的高性能MoS₂基HER电催化剂提供新的灵感。
