In-situ X-ray techniques for non-noble electrocatalysts

Sung Fu Hung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Electrocatalysis offers an alternative solution for the energy crisis because it lowers the activation energy of reaction to produce economic fuels more accessible. Non-noble electrocatalysts have shown their capabilities to practical catalytic applications as compared to noble ones, whose scarcity and high price limit the development. However, the puzzling catalytic processes in non-noble electrocatalysts hinder their advancement. In-situ techniques allow us to unveil the mystery of electrocatalysis and boost the catalytic performances. Recently, various in-situ X-ray techniques have been rapidly developed, so that the whole picture of electrocatalysis becomes clear and explicit. In this review, the in-situ X-ray techniques exploring the structural evolution and chemical-state variation during electrocatalysis are summarized for mainly oxygen evolution reaction (OER), hydrogen evolution reaction (HER), oxygen reduction reaction (ORR), and carbon dioxide reduction reaction (CO2RR). These approaches include X-ray Absorption Spectroscopy (XAS), X-ray diffraction (XRD), and X-ray Photoelectron Spectroscopy (XPS). The information seized from these in-situ X-ray techniques can effectively decipher the electrocatalysis and thus provide promising strategies for advancing the electrocatalysts. It is expected that this review could be conducive to understanding these in-situ X-ray approaches and, accordingly, the catalytic mechanism to better the electrocatalysis.

Original languageEnglish
Article number20191006
JournalPure and Applied Chemistry
Issue number5
StatePublished - 1 May 2020


  • 2019 IUPAC-Solvay Award
  • electrocatalysis
  • in-situ techniques
  • IUPAC-SOLVAY International Award for Young Chemists
  • non-noble electrocatalysts
  • operando
  • XAS
  • XPS
  • XRD


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