In Situ Phase Transformation on Nickel-Based
Selenides for Enhanced Hydrogen Evolution Reaction in Alkaline Medium
Posted on 2020-07-07 - 21:06
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.
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Zhai, Lingling; Benedict Lo, Tsz Woon; Xu, Zheng-Long; Potter, Jonathan; Mo, Jiaying; Guo, Xuyun; et al. (2020). In Situ Phase Transformation on Nickel-Based
Selenides for Enhanced Hydrogen Evolution Reaction in Alkaline Medium. ACS Publications. Collection. https://doi.org/10.1021/acsenergylett.0c01385