摘要
The most abundant rare earth metals in the Earth’s crust have received considerable recent attention as efficient electrocatalysts for full water splitting,but it is highly desired to explore a new strategy to improve their catalytic activity.In this communication,we report the development of nanoporous CeO_(2) nanowire array on Ti mesh(np-CeO_(2)/TM)derived from MnO_(2)–CeO_(2)/TM via an acid etching strategy,and MnO_(2) acts as a pore-forming agent through selective etching with oxalic acid.As a rare earth metal catalyst,np-CeO_(2)/TM needs an overpotential of 91 mV for the hydrogen evolution reaction(HER)and 279 mV for the oxygen evolution reaction(OER)to drive a current density of 10 mV cm^(−2) in 1.0 M KOH,93 mV and 101 mV less than that needed by MnO_(2)–CeO_(2)/TM,respectively.We also demonstrate the use of np-CeO_(2)/TM to make a two-electrode electrolyzer capable of driving 10 mV cm^(−2) at a cell voltage of 1.57 V.
基金
supported by the National Natural Science Foundation of China(no.21575137).
