Electrochemically Fabricated Pd–In Catalysts for Carbon Dioxide‐Formate/Formic Acid Inter‐Conversion

Abstract

Pd–In catalysts were electrochemically prepared for application in unitized regenerative fuel cells based on carbon dioxide and formic acid. The morphology and composition of the Pd–In catalysts were controlled by varying the concentration of the In precursor in a deposition bath. The catalytic activity was then investigated for both formic acid oxidation and carbon dioxide reduction reactions. In order to enhance their activity and stability, the Pd–In catalysts were annealed under Ar atmosphere, resulting in better activities than those of the as‐deposited Pd–In catalysts. Although the activity was not excellent, this effort aimed at the development of bimetallic catalysts paves the way toward inter‐conversion electrodes active in both the electrochemical carbon dioxide reduction and formic acid oxidation reactions.