Cactus-like NC/CoxP electrode enables efficient and stable hydrogen evolution for saline water splitting
NEW CARBON MATERIALS(2024)
Abstract
Designing efficient and robust catalysts for hydrogen evolution reaction (HER) is imperative for saline water electrolysis technology. A catalyst composed of CoxP nanowires array with N-doped carbon nanosheets (NC) was fabricated on Ni foam (NF) by an in -situ growth strategy. The material is designated as NC/CoxP@NF. In the preparation process, Co(OH)2 nanowires were transformed into a metal organic framework of cobalt (ZIF -67) on NF by the dissolution -coordination of endogenous Co2+ and 2-methylimidazole. The resulting cactus -like microstructure gives NC/CoxP@NF abundant exposed active sites and ion transport channels, which improve the HER catalytic reaction kinetics. Furthermore, the interconnected alternating nanowires and free -standing nanosheets in NC/CoxP@NF improve its structural stability, and the formation of surface polyanions (phosphate) and a NC nanosheet protective layer improve the anti -corrosive properties of catalysts. Thus, the NC/CoxP@NF has an excellent performance, requiring overpotentials of 107 and 133 mV for HER to achieve 10 mA cm-2 in 1.0 mol L-1 KOH and 1.0 mol L-1 KOH + 0.5 mol L-1 NaCl, respectively. This in -situ transformation strategy is a new way of constructing highly-efficient HER catalysts for saline water electrolysis.
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Key words
Hydrogen evolution reaction,Nanoarchitecture,Transition metal phosphide,Chlorine-corrosion resistance,Saline water splitting
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