Proton–electron temporal asynchrony on femtosecond timescales enables anti-corrosive low-iridium anodes for PEM electrolysers

Abstract The development of corrosion-resistant low-iridium anode catalysts is the key challenge in proton exchange membrane water electrolysis. However, the fundamental origin of anodic corrosion has been intensely debated over the years, mainly because of the limited mechanistic understanding of the complex proton-coupled electron transfer process. In this work, we employed femtosecond electrochemical transient absorption spectroscopy to probe the spatial–temporal synchronization of protons and electrons during the elementary proton-coupled electron transfer step at the femtosecond (10 −15 s) timescale. Here we show that anodic corrosion is initiated within 100 fs after polarization startup, driven by…

• NN
  National Natural Science Foundation of China

  Awards: 22221001, 22425105, 223B2104, 224B2105, 22271124, 22425105, 22221001, 22271124, 223B2104 and 224B2105
• FR
  Fundamental Research Funds for the Central Universities

  Awards: lzujbky-2023-stlt01, lzujbky-2024-it01, lzujbky-2023-eyt03