Study on the performance of NiO modified nano-porous Ag electrocatalytic oxidation of sodium borohydride

Abstract

In order to improve the catalytic efficiency of metal catalysts for borohydride fuel cells, three-dimensional nano-porous Ag/NiO composite catalysts were prepared by dealloying method, with Al-Ag and Al-Ag-Ni as precursor alloys. On the premise of reducing the amount of Ag used, the catalyst has significantly improved its performance of electrocatalytic sodium borohydride oxide by virtue of the addition of NiO and its structural advantages. Among them, the nano porous Ag/NiO catalyst obtained after dealloying the precursor alloy Al90Ag9Ni1 has the best performance in the performance test of electrocatalytic oxidation of sodium borohydride, with a peak current density of 158.72 mA· mg-1, and a catalytic performance improvement of 35% compared to the nano porous Ag (116.88 mA· mg-1). This catalyst provides a feasible improvement method for improving the activity of sodium borohydride fuel cell catalysts and reducing costs.

Keywords

• borohydride fuel cell
• catalyzer
• dealloying
• electrocatalytic performance