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

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% (CoSe 2 ) has the highest catalytic performance among all M-Se-L. Furthermore, Ni 2 P was compounded with CoSe 2 to form a heterogeneous structure Ni 2 P/CoSe 2 /NF. And the temperature and quality of NaH 2 PO 2 during the synthesis process were optimized. It was found that the Ni 2 P/CoSe 2 /NF synthesized at 300 °C with 1.2 g NaH 2 PO 2 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 Ni 2 P/CoSe 2 /NF||Ni 2 P/CoSe 2 /NF dual-electrode electrolyzer 1.607 V required to reach 100 mA cm −2 . The present work shows that Ni 2 P/CoSe 2 /NF is an efficient bifunctional electrocatalyst with good prospects for industry applications.