▎ 摘　　要

Three anodic electrocatalysts containing Ni-Pt core-shell (C-Ni-S-Pt), Ni-Pd core-shell (C-Ni-S-Pd) and Ni-Ru core-shell (C-Ni-S-Ru) nanoparticles were fabricated on reduced graphene oxide (rGO)viaa two-step consecutive reduction process. The rGO-based catalysts were characterizedviaXRD, FE-SEM, EDAX, TEM, HR-TEM and XPS. The effect of C-Ni-S-Pt/rGO, C-Ni-S-Pd/rGO and C-Ni-S-Ru/rGO toward the borohydride oxidation reaction (BOR) was evaluated in a half-cell and also in a single direct borohydride-hydrogen peroxide fuel cell (DBHPFC). The electrochemical measurements indicated that C-Ni-S-Pd/rGO exhibited the highest current density for borohydride oxidation (39 085 A g(-1)) compared to C-Ni-S-Pt/rGO (30 790 A g(-1)) and C-Ni-S-Ru/rGO (4563 A g(-1)) with the same catalyst loading. The highest power density of 310.20 mW cm(-2)at a current density of 264 mA cm(-2)with 2 M H(2)O(2)and 1 M NaBH(4)solution at 60 degrees C was achieved with C-Ni-S-Pd/rGO as a suitable electrocatalyst. This system enhanced the power generation by 32.57% and 80.98% in comparison with that of C-Ni-S-Pt/rGO (233.98 mW cm(-2)) and C-Ni-S-Ru/rGO (171.40 mW cm(-2)), respectively. Thus, this study revealed that C-Ni-S-Pd/rGO is a suitable anodic electrocatalyst for application in DBHPFCs in comparison with the commercially used Pt-based electrocatalysts because of its advantages such as low cost, high activity toward the BOR and stability in fuel cells.