The importance of carefully choosing vertex potentials in hydrogen underpotential deposition

Sengeni Anantharaj*, Suguru Noda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Accurate determination of electrochemical surface area (ECSA) is not always possible even for simple monometallic catalysts with well-known techniques. An example is Pt and the determination of its ECSA by hydrogen underpotential deposition (HUPD) used to determine the specific activity. Here, we show an important problem in determining the ECSA of Pt (both wire and foil electrodes) using HUPD which is the changing ECSA with the changing anodic and cathodic vertex potentials (Evertex) set in HUPD analysis. The results confirm that just by varying the Evertex one could get a wide range of values for ECSA and the ECSA normalized specific activity for the same Pt electrode. This calls for instant remedial action as Pt is not just any catalyst but state-of-the-art in many energy conversion reactions and our study suggests that the Evertex should be chosen based on whether or not to have the effect of Pt oxidation on ECSA.

Original languageEnglish
Article number101234
JournalMaterials Today Energy
Publication statusPublished - 2023 Mar


  • Electrocatalysis
  • Electrochemical surface area
  • Energy conversion reaction
  • Real surface area
  • Specific activity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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