Abstract:
Given the low conductivity, poor catalytic activity, and high cost of traditional noble metal-oxygen evolution reaction (OER) electrocatalysts, it is urgent to develop electrocatalysts with high efficiency, durability, low cost, high exposed active surface, and excellent electrical conductivity. The Silver nanowire@Polypyrrole (AgNWs@PPy) aerogels were synthesized by freeze-drying method, and then nano-CoNi alloy was grown on the surface of AgNWs@PPy aerogels framework by solvothermal method, and AgNWs@PPy@CoNi aerogels with good OER electrocatalytic performance was obtained. The results show that the catalytic performance of AgNWs@PPy@CoNi aerogels first increase and then weaken with the increase of Co
2+ and Ni
2+ concentrations. When the Co
2+ and Ni
2+ concentrations are 0.0175 mol/L, the AgNWs@PPy@CoNi aerogels exhibite high current density. At 10 mA·cm
−2, the overpotential is 346 mV, and the Tafel slope is 86.25 mV·dec
−1. After a 10-hour stability test under a constant voltage, the current retention rate reaches 93.9%, which has good stability. The three-dimensional independent AgNWs@PPy aerogels provide excellent electrical conductivity, and the CoNi alloy provides abundant active sites. The combined effect of them shows excellent OER catalytic performance, which is expected to replace precious metal catalysts and become a new type of OER catalytic material.