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Identifying Electrocatalytic Sites of the Nanoporous Copper–Ruthenium Alloy for Hydrogen Evolution Reaction in Alkaline Electrolyte
journal contribution
posted on 2019-12-13, 20:34 authored by Qiuli Wu, Min Luo, Jiuhui Han, Wei Peng, Yang Zhao, Dechao Chen, Ming Peng, Ji Liu, Frank M. F. de Groot, Yongwen TanHydrogen production from electrochemical water splitting
is a promising
route to pursue clean and sustainable energy sources. Here, a three-dimensional
nanoporous Cu–Ru alloy is prepared as a high-performance platinum-free
catalyst for hydrogen evolution reaction (HER) by a dealloying process.
Significantly, the optimized nanoporous alloy Cu53Ru47 exhibits remarkable catalytic activity for HER with nearly
zero onset overpotential and ultralow Tafel slopes (∼30 and
∼35 mV dec–1) in both alkaline and neutral
electrolytes, achieving a catalytic current density of 10 mA cm–2 at low overpotentials of ∼15 and ∼41
mV, respectively. Operando X-ray absorption spectroscopy experiments,
in conjunction with DFT simulations, reveal that the incorporation
of Ru atoms into the Cu matrix not only accelerates the reaction step
rates of water adsorption and activation but also optimizes the hydrogen
bonding energy on Cu and Ru active sites, improving the intrinsic
activity for HER.
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optimized nanoporous alloy Cu 53 Ru 47 exhibitsenergy sourcesreaction step ratesHydrogen Evolution ReactionElectrocatalytic SitesOperando X-ray absorption spectroscopy experimentsplatinum-free catalystRu atomshydrogen evolution reactiondealloying processDFT simulationsmVelectrochemical water splittingCu matrixAlkaline Electrolyte Hydrogen productionHERonset overpotentialwater adsorption
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