Assessment of the Stability and Operability of Cobalt Phosphide Electrocatalyst for Hydrogen Evolution

Hyun Seo Ahn, Allen J. Bard

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Transition metal phosphides have been investigated heavily as hydrogen evolution reaction (HER) catalysts. One of the most active transition metal phosphides, CoP, has been tested for its stability and operability under mild conditions that it may be exposed to in its applications (photoelectrochemistry and artificial photosynthesis). Surface-interrogation scanning electrochemical microscopy (SI-SECM) revealed that CoP HER catalyst is vulnerable to oxidation (by oxygen and chemical oxidants). The degradation mechanism was shown to be surface oxidation by dioxygen, followed by acid etching of the oxidized layer. The compositional integrity (unity ratio of cobalt and phosphorus) was maintained throughout the film decomposition progress. (Graph Presented).

Original languageEnglish
Pages (from-to)8574-8579
Number of pages6
JournalAnalytical Chemistry
Volume89
Issue number16
DOIs
Publication statusPublished - 2017 Aug 15

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Electrocatalysts
Cobalt
Transition metals
Hydrogen
Oxygen
Oxidation
Catalysts
Photosynthesis
Oxidants
Phosphorus
Etching
Microscopic examination
Decomposition
Scanning
Degradation
Acids

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

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Assessment of the Stability and Operability of Cobalt Phosphide Electrocatalyst for Hydrogen Evolution. / Ahn, Hyun Seo; Bard, Allen J.

In: Analytical Chemistry, Vol. 89, No. 16, 15.08.2017, p. 8574-8579.

Research output: Contribution to journalArticle

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