期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 7, 页码 6486-6491出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00719
关键词
alpha-CoCr oxyhydroxide; oxygen evolution reaction; interlayer anions; current density; exceptionally thin hydroxides; ultradurable; alkaline water electrolysis
资金
- Higher Education Commission, Islamabad, Pakistan
Owing to their catalytic, electronic, and optical properties, metal hydroxides are extensively used in energy applications. Despite recent progress, the synthesis of monolayer metal hydroxides with unique structures remains a challenge, and their potential use in the oxygen evolution reaction (OER) has not been fully investigated. Herein, the fabrication of chromium-substituted alpha-cobalt hydroxide through a simple co-precipitation method under optimum conditions at higher pH is described. Such nanostructures can competently catalyze oxygen evolution reactions to produce a current density of 10 mA cm(-2) at an overpotential of 240 mV in alkaline medium. Microscopic, electrochemical, and spectroscopic analyses reveal that the exceptional OER performance originates from thin monolayer sheets with exposed active sites and partially due to the substitution of alpha-CoOOH with Cr. The phase purity is highlighted through powder X-ray diffraction (PXRD), energy-dispersive X-ray (EDX) mapping, and X-ray photoelectron spectroscopy (XPS) analysis.
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