Journal
CRYSTAL RESEARCH AND TECHNOLOGY
Volume 54, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/crat.201800248
Keywords
electrocatalyst; hydrogen evolution; hydrothermal synthesis; Ni-doped CuCo2S4; water splitting
Categories
Funding
- Natural Science Foundation of Ningxia Province [NZ15053, NZ17036, 2018AAC03032]
- National Natural Science Foundation of China [21865022, 21862015]
- National First-Rate Discipline Project of Ningxia (Chemical Engineering and Technology) [NXYLXK2017A04]
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Developing high-efficiency electrocatalysts for hydrogen evolution reaction (HER) is vitally important in electrochemical water splitting technology. Herein, ultra-small Ni-doped CuCo2S4 nanoparticles (NCCS NPs) are easily achieved in a single step by a facile hydrothermal method. The investigations, using powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and TEM, reveal that the as-prepared NCCS products are composed of a large number of uniform nanoparticles with sizes ranging from 20 to 50 nm. Triethanolamine is of vital importance for the formation of the NCCS NPs during the sulfidation process. As a promising electrocatalyst for HER, the NCCS NPs not only display a lower overpotential at 10 mA cm(-2) current density than that of bare CuCo2S4 nanoparticles (CCS NPs), but also show better long-term durability than CCS NPs during the galvanostatic electrolysis. Furthermore, Ni doping for NCCS NPs are proved to play a particular important role in the HER process. This finding provides a strategy in compositional tuning of mixed polymetallic sulfides catalysts for electrochemical hydrogen evolution.
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