In:
Journal of The Electrochemical Society, The Electrochemical Society, Vol. 170, No. 3 ( 2023-03-01), p. 036509-
Abstract:
Layered double hydroxide (LDH) catalysts provide promising OER activity which can be employed in overall water splitting for hydrogen production. However, their weak surface hydrogen adsorption (H ad ) and high water dissociation energy can result in the inferior hydrogen evolution reactions (HER) activity. In this paper, a highly efficient HER catalyst of F-doped NiCoMo LDH is successfully designed and synthesized through in situ growing on nickel foam (F-NiCoMo LDH/NF) for overall water splitting. DFT calculations demonstrate that the introduction of Mo and F atoms in NiCo LDH can induce the generation of anisotropic lattice strain, resulting in the generation of high-energy active interface and shifting the d -band centers. Therefore, the adsorption energy of H ad is optimized and the water dissociation energy barrier is decreased. As a result, this F-NiCoMo LDH/NF catalyst electrode displays a low overpotential of 107.5 mV at 10 mA cm −2 and a small Tafel slope of 67.2 mV dec −1 for HER. The assembled electrolyzer by employing this catalyst electrode requires only 1.83 V to deliver 300 mA cm −2 and operates stably for 100 h.
Type of Medium:
Online Resource
ISSN:
0013-4651
,
1945-7111
DOI:
10.1149/1945-7111/acc555
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2023
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