HER performance of Ni3Se2/Fe, Ni3Se2/Co and Ni3Se2/Mo composite materials with multistage structure

In this paper, nanowool ball Ni 3 Se 2 , rod NiSe and multistage Ni 3 Se 2 were prepared. Multilevel Ni 3 Se 2 was doped with Fe, Co and Mo respectively to prepare composite catalysts. The prepared materials were characterized by UV, XRD, SEM-EDS and XPS . The results show that the composite catalysts with multi-level Ni 3 Se 2 and Mo have special morphology and high purity. The HER performance of the composites was tested using an electrochemical workstation, and the results show that at a current density of 10 mA cm −2 , the overpotentials of Ni 3 Se 2 , Ni 3 Se 2 /Fe, Ni 3 Se 2 /Co and Ni 3 Se 2 /Mo are 71, 71, 3 and 37 mV, respectively; At a current density of 100 mA cm −2 , their overpotentials are 396.9, 373.6, 321.8 and 290.1 mV, respectively. Their Tafel slopes are 227, 169, 145 and 137 mV dec −1 , respectively. The R ct s of Ni 3 Se 2 , Ni 3 Se 2 /Fe, Ni 3 Se 2 /Co and Ni 3 Se 2 /Mo are 1.63, 1.47, 1.15 and 0.90Ω, respectively. After the comparison of the electrochemical HER performance, it is found that the Ni 3 Se 2 /Mo composite catalyst has good HER performance.