关键词: 过渡金属磷化物, 二氧化铈, 电解海水, 析氢反应, 析氧反应

Abstract: In this paper, CeO₂-modified vanadium-doped porous nickel-iron phosphide nanosheet catalyst electrodes (V-NiFeP@CeO₂) were in-situ grown on nickel foam substrates through hydrothermal method, phosphating treatment, element doping and electrodeposition. V doping increased the number of active sites, and phosphorization could adjust the electronic structure. The interface interaction between CeO₂ and V-NiFeP was conducive to electron transfer and reactant adsorption, thereby enhancing the catalytic activity. The hydrogen evolution and oxygen evolution performance of the prepared bifunctional catalyst in alkaline solution and alkaline seawater solution were studied. The results of full water electrolysis tests showed that the required cell voltage of the catalyst at a current density of 100 mA·cm-2 in alkaline solution and alkaline seawater solution was only 1.83 and 1.85 V, respectively, along with stable operation for 27 h at a current density of 10 mA·cm-2 without voltage decay. The results exhibit V-NiFeP@CeO₂ has excellent electrocatalytic performance and long-term durability.

Key words: Transition metal phosphides, CeO₂, Electrolysis of seawater, Hydrogen evolution reaction, Oxygen evolution reaction