Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction

Fadl H. Saadi, Azhar I. Carim, Walter S. Drisdell, Sheraz Gul, Jack H. Baricuatro, Junko Yano, Manuel P. Soriaga, Nathan S. Lewis

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Abstract

Transition metal phosphides exhibit high catalytic activity toward the electrochemical hydrogen-evolution reaction (HER) and resist chemical corrosion in acidic solutions. For example, an electrodeposited CoP catalyst exhibited an overpotential, of â'< 100 mV at a current density of â'10 mA cm-2 in 0.500 M H2SO4(aq). To obtain a chemical description of the material as-prepared and also while effecting the HER in acidic media, such electrocatalyst films were investigated using Raman spectroscopy and X-ray absorption spectroscopy both ex situ as well as under in situ and operando conditions in 0.500 M H2SO4(aq). Ex situ analysis using the tandem spectroscopies indicated the presence of multiple ordered and disordered phases that contained both near-zerovalent and oxidized Co species, in addition to reduced and oxygenated P species. Operando analysis indicated that the active electrocatalyst was primarily amorphous and predominantly consisted of near-zerovalent Co as well as reduced P.

Original languageEnglish
Pages (from-to)12927-12930
Number of pages4
JournalJournal of the American Chemical Society
Volume139
Issue number37
DOIs
Publication statusPublished - Jan 1 2017

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Saadi, F. H., Carim, A. I., Drisdell, W. S., Gul, S., Baricuatro, J. H., Yano, J., Soriaga, M. P., & Lewis, N. S. (2017). Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction. Journal of the American Chemical Society, 139(37), 12927-12930. https://doi.org/10.1021/jacs.7b07606