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Stable hydrogen evolution reaction at high current densities via designing the Ni single atoms and Ru nanoparticles linked by carbon bridges
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Stable hydrogen evolution reaction at high current densities via designing the Ni single atoms and Ru nanoparticles linked by carbon bridges
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Journal Article
Stable hydrogen evolution reaction at high current densities via designing the Ni single atoms and Ru nanoparticles linked by carbon bridges
2024
Overview
Continuous and effective hydrogen evolution under high current densities remains a challenge for water electrolysis owing to the rapid performance degradation under continuous large-current operation. In this study, theoretical calculations, operando Raman spectroscopy, and CO stripping experiments confirm that Ru nanocrystals have a high resistance against deactivation because of the synergistic adsorption of OH intermediates (OH
ad
) on the Ru and single atoms. Based on this conceptual model, we design the Ni single atoms modifying ultra-small Ru nanoparticle with defect carbon bridging structure (UP-RuNi
SAs
/C) via a unique unipolar pulse electrodeposition (UPED) strategy. As a result, the UP-RuNi
SAs
/C is found capable of running steadily for 100 h at 3 A cm
−2
, and shows a low overpotential of 9 mV at a current density of 10 mA cm
−2
under alkaline conditions. Moreover, the UP-RuNi
SAs
/C allows an anion exchange membrane (AEM) electrolyzer to operate stably at 1.95 V
cell
for 250 h at 1 A cm
−2
.
Understanding the sustained stability of alkaline hydrogen evolution at high current densities is crucial. Herein, the authors synthesize Ni single atoms, modified with ultra-small Ru nanoparticles with a defective carbon bridging structure, capable of running steadily for 100 h at 3 A cm
−2
.
