Bixbyite-type Ln₂O₃ as promoters of metallic Ni for alkaline electrocatalytic hydrogen evolution.

ABSTRACT: The active-site density, intrinsic activity, and durability of Ni-based catalysts are critical to their application in industrial alkaline water electrolysis. This work develops a kind of promoters, the bixbyite-type lanthanide metal sesquioxides (Ln₂O₃), which can be implanted into metallic Ni by selective high-temperature reduction to achieve highly efficient Ni/Ln₂O₃ hybrid electrocatalysts toward hydrogen evolution reaction. The screened Ni/Yb₂O₃ catalyst shows the low overpotential (20.0 mV at 10 mA cm^-2), low Tafel slope (44.6 mV dec^-1), and excellent long-term durability (360 h at 500 mA cm^-2), significantly outperforming the metallic Ni and benchmark Pt/C catalysts. The remarkable hyd

SUBMITTER: Sun H 

PROVIDER: S-EPMC9256667 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature