Layered double (Ni, Fe) hydroxide grown on nickel foam and modified by nickel carbonyl powder and carbon black as an efficient electrode for water splitting

摘要

Developing novel oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) catalysts is vital for water splitting. Here, carbon black (CB) and nickel carbonyl powder (NCP) are used as components, and the nonionic surfactant polyvinyl pyrrolidone (PVP) is used as a shape-controlled capping agent to easily prepare layered double (Ni, Fe) hydroxide (NiFe-LDH) electrodes. Scanning electron microscopy observation and X-ray photoelectron spectra analysis show that the Fe2+ -doped layered double hydroxide is grown in situ on nickel foam (NF). CB (XC-72) and NCP further improve the electrical conductivity. At 10 mA.cm(-2), the overpotentials of the OER and HER are 203 mV and 83 mV, respectively, in 1 M KOH. Only 1.48 V is needed when both electrodes are applied for water splitting, and it has a stability of more than 100 h. This work can be used as a medium to elevate the OER and HER performance of NiFe-LDH-based catalysts. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.