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http://hdl.handle.net/10397/92522
Title: | In situ phase transformation on nickel-based selenides for enhanced hydrogen evolution reaction in alkaline medium | Authors: | Zhai, L Lo, TWB Xu, ZL Potter, J Mo, J Guo, X Tang, CC Tsang, SCE Lau, SP |
Issue Date: | 14-Aug-2020 | Source: | ACS energy letters, 14 Aug. 2020, v. 5, no. 8, p. 2483-2491 | Abstract: | Identification of the active species in electrocatalysts toward hydrogen evolution reaction (HER) is of great significance for the development of the catalytic industry; however, it is still the subject of considerable controversy. Herein, we applied operando synchrotron X-ray powder diffraction (SXRD) in the NiSe2 electrocatalyst system, and an in situ phase transformation from cubic NiSe2 to hexagonal NiSe was revealed. The NiSe phase showed an enhanced catalytic activity. Operando Raman spectroscopy verified the decomposition of NiSe2 during HER. Theoretical calculations suggested that the charge transfers from the Se site to Ni site during this evolution process, leading to an increased conductivity and a shifting up of d-band center, which is attributed to the enhanced activity. The generated NiSe phase acts as the “real” active species. Our work unravels the underlying phase transition of the electrocatalyst on reductive conditions in alkaline medium and highlights the significance of identifying the intrinsic active sites under realistic reaction conditions. | Publisher: | American Chemical Society | Journal: | ACS energy letters | ISSN: | 2380-8195 | DOI: | 10.1021/acsenergylett.0c01385 | Rights: | © 2020 American Chemical Society This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsenergylett.0c01385 |
Appears in Collections: | Journal/Magazine Article |
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acsenergylett.0c01385.pdf | Pre-Published Version | 1.58 MB | Adobe PDF | View/Open |
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