Performance of supported Au-Co alloy as the anode catalyst of direct borohydride-hydrogen peroxide fuel cell

摘要

Au-Co alloys supported on Vulcan XC-72R carbon were prepared by the reverse micro-emulsion method and used as the anode electrocatalyst for direct borohydride-hydrogen peroxide fuel cell (DBHFC). The physical and electrochemical properties were investigated by energy dispersive X-ray (EDX), X-ray diffraction (XRD), cyclic voltammetry, chron-amperometry and chronopotentiometry. The results show that supported Au-Co alloys catalysts have higher catalytic activity for the direct oxidation of BH4 than pure nanosized Au catalyst, especially the Au_(45)Co_(55)/C catalyst presents the highest catalytic activity among all as-prepared Au-Co alloys, and the DBHFC using the Au_(45)Co_(55)/C as anode electrocatalyst shows as high as 66.5 mW cm~(-2) power density at a discharge current density of 85 mA cm~(-2) at 25 ℃.