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Transition-metal phosphides have been intensively and extensively studied as earth-abundant catalysts for effective hydrogen evolution electrocatalysis, but it is highly desired to explore a new strategy to improve the catalytic activity. In this work, a nanoporous CoP 3 nanowire array on Ti mesh (np-CoP 3 /TM) was derived from MnO 2 –CoP 3 /TM by acid etching of MnO 2 that acts as a pore-forming agent. As a non-noble-metal catalyst for the hydrogen evolution reaction, the resulting np-CoP 3 /TM demonstrates enhanced performance with the need of an overpotential of 76 mV ( j = 10 mV cm –2 ), 45 mV less than that needed by MnO 2 –CoP 3 /TM. Moreover, it also shows a good durability for at least 60 h.
Ji et al. (Mon,) studied this question.