Self-assembly of Ni2P/CoSe2 heterostructure as bifunctional electrocatalysts for urea-water electrolysis

摘要

In this paper, M-Se-L (M = Co, Ni, Fe. L = Se At) were synthesized by solvothermal method. The results from electrochemical testing showed that Co-Se-75 (CoSe2) has the highest catalytic performance among all M-Se-L. Furthermore, Ni2P was compounded with CoSe2 to form a heterogeneous structure Ni2P/CoSe2/NF. And the temperature and quality of NaH2PO2 during the synthesis process were optimized. It was found that the Ni2P/CoSe2/NF synthesized at 300 C with 1.2 g NaH2PO2 had better catalytic performance. Only 1.383 V is required for UOR to reach 100 mA cm(-2). In alkaline urea-water system, the electrolytic voltage of Ni2P/CoSe2/NFNi2P/CoSe2/NF dual-electrode electrolyzer 1.607 V required to reach 100 mA cm(-2). The present work shows that Ni2P/CoSe2/NF is an efficient bifunctional electrocatalyst with good prospects for industry applications. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.