Abstract
Dynamic adsorption processes of reaction intermediates for alkaline hydrogen evolution(HER)catalysts are still con-fusing to understand.Here,we report a series of A-site ordered quadruple perovskite ruthenium-based electrocatalysts ACu3Ru4O12(A=Na,Ca,Nd,and La),with the target sample SrCu3Ru4O12 exhibiting a very low overpotential(46 mV@10 mA·cm-2)and excellent catalytic stability with little decays after 48-h durability test.Precise tuning A-site cations can change the average valence state of Cu and Ru,thus the plot of HER activity versus the average Ru valence number shows a volcano-type relationship.Density functional theory indicates that the Ru 4d orbitals of SrCu3Ru4O12 possesses the most suitable d-band center position among the five samples,which might be the key parameter to determine the cat-alytic performance.Our work provides further insight into the discovering advanced,efficient hydrogen evolution catalysts through designing precise descriptor.
维普
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