Cu(OH)₂ Nanorods/Ni(OH)₂ Nanosheets as Highly Efficient Catalyst for Hydrogen Evolution Reaction

Abstract

Reasonably designing the catalyst in-situ grown on conductive substrate is a promising avenue to ameliorate the hydrogen evolution reaction (HER). In this work, we fabricated Cu(OH) 2 nanorods (NRs) and Ni(OH) 2 nanosheets (NSs) on single crystal Cu foil for the first time. The structure and morphology of all samples were systematically investigated by XRD and SEM, respectively. XPS was carried out to measure the element composition and valence state. The synergistic effect of metal double hydroxides significantly improved the catalytic performance of hydrogen evolution in neutral electrolytes. And it also showed a high catalytic stability. The overpotential at 10 mA/ cm 2 and Tafel slope of Cu(OH) 2 NRs @ Ni(OH) 2 NSs were 200 mV and 120 mV/dec, respectively, which was markedly better than other materials reported previously.

Free-standing Co/Zn sulfide supported on Cu-foam for efficient overall water splitting

“…It has been reported that Cu(OH) 2 could behave as active sites to promote the HER. 50 The newly formed active site, i.e., Cu(OH) 2 offsets the disappearance of the original active sites, i.e., CoS on the sample surfaces; therefore, the electrode activity did not undergo a significant attenuation.…”

“…It has been reported that Cu(OH) 2 could behave as active sites to promote the HER. 50 The newly formed active site, i.e. , Cu(OH) 2 offsets the disappearance of the original active sites, i.e.…”