Cactus-like NC/CoxP electrode enables efficient and stable hydrogen evolution for saline water splitting
Designing efficient and robust catalysts for hydrogen evolution reaction(HER)is imperative for saline water electro-lysis 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-stand-ing 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.
Hydrogen evolution reactionNanoarchitectureTransition metal phosphideChlorine-corrosion resistanceSaline wa-ter splitting
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