Deposition of IrO₂ on Nb-doped SnO₂ as Electrocatalysts for Oxygen Evolution Reactions

Abstract

We reported sol-gel-derived Nb-doped SnO₂ which is an effective catalyst carrier for deposition of IrO₂, and the electrocatalytic activity of the synthesized catalysts for OER was investigated. It is found that the doping of Nb can refine the SnO₂ crystal grains and improve the electrical conductivity of SnO₂. When the doping amount of Nb is 7%, the electrical conductivity of Nb-SnO₂ reaches a maximum value of 3.54 S/cm. With the increase in the loading amount of IrO₂, the electrocatalytic activity towards OER of the thus-synthesized catalysts is improved, reaching a comparable OER activity with pristine IrO₂ with the loading content of about 44wt%.

Keywords

electrolysis / iridium / oxygen evolution / Nb-SnO₂