Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 331, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.122710
Keywords
Hydrogen evolution reaction; Ru-decorated catalyst; Density functional theory; Water splitting; Synergistic effects
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Density functional theory (DFT) is used to predict the behavior of ruthenium-doped nickel cobalt alloy in the alkaline hydrogen evolution reaction (HER). DFT calculation shows that a synergistic effect at the Ru-Ni/Co interface accelerates water dissociation and optimizes the adsorption-desorption energetics toward the H intermediate. However, excessive Ru introduction leads to over-strong hydrogen adsorption on the catalyst surface, limiting H2 release.
Density functional theory (DFT) is used to predict the behavior of ruthenium-doped nickel cobalt alloy in the alkaline hydrogen evolution reaction (HER). According to DFT calculation, a synergistic effect at the Ru-Ni/Co interface is generated to accelerate water dissociation and optimize the adsorption-desorption energetics toward the H intermediate. However, excessive Ru introduction will lead to over-strong hydrogen adsorption on the catalyst surface, thus limiting H2 release. As a proof of concept, we design a series of NiCoRux/SP, among which the optimized NiCoRu0.2/SP electrocatalyst achieves an overpotential of 59 mV at 10 mA cm-2, while excessive Ru incorporation (NiCoRu0.3/SP) diminishes the HER activity. X-ray absorption spectroscopy and other characterizations further confirm that the interface-induced electron transfer from atomic Ru to its surrounding Ni/ Co, and the activity degradation caused by excessive Ru incorporation is attributed to the generation of Ru cluster that sacrifices the interface between Ru atom and Ni/Co.
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