Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.359
Publication date: 7th February 2022
CoSe is considered as a promising non-noble-metal electrocatalyst for hydrogen evolution reaction (HER) in acid media. However, there is still space for improvement on this electrocatalyst, and one of the possible strategies is to combine it with small amount of noble metal. Therefore, we synthesized CoSe nanocrystals (NCs) decorated with Ru clusters. The Ru-CoSe nanocomposite shows better performance than the pristine CoSe NCs, and is even found to outperform the benchmark Pt/C catalyst under high current conditions. To find the reason behind the outstanding electrocatalytic performance of Ru-CoSe nanocomposite, we discover that this Ru−CoSe system undergoes chemical and structural transformations under hydrogen evolution conditions in acid media: the hexagonal CoSe NCs are converted into CoSe2 NCs which have a cubic structure. The Co that is extracted from CoSe during this process combines with oxide and hydroxide species and forms a Co oxide/hydroxide layer; the Ru clusters aggregate and form Ru NCs. Such modifications result in a final Ru−CoOx/Co(OH)x−CoSe2 nanocomposite that exhibits an enhanced hydrogen evolution activity.
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