The application of scanning electrochemical microscopy to the discovery of Pd-welectrocatalysts for the oxygen reduction reaction that demonstrate high activity, stability, and methanol tolerance

摘要

An array of Pd-W alloys was fabricated, and the electrocatalytic activity of the alloys for the oxygen reduction reaction (ORR) in acidic media was screened by scanning electrochemical microscopy. The Pd _(0.7)W _(0.3) showed the highest activity for the ORR, close to that for Pd _(0.8)Co _(0.2) and Pt. A Pd-W electrocatalyst loaded on carbon black was formed by the NaBH _4-reduction method, exhibiting high activity and stability, suggesting that it is a good candidate for the proton exchange membrane fuel cell cathode.