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

Hyun S. Ahn; Allen J. Bard

doi:10.1021/acs.analchem.7b02799

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

Hyun S. Ahn, Allen J. Bard

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

14 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 language	English
Pages (from-to)	8574-8579
Number of pages	6
Journal	Analytical Chemistry
Volume	89
Issue number	16
DOIs	https://doi.org/10.1021/acs.analchem.7b02799
Publication status	Published - 2017 Aug 15

Bibliographical note

Funding Information:
The authors thank Dr. Juan F. Callejas and Prof. Raymond E. Schaak for helpful discussions during the inception of the project. This work was supported by NSF under the NSF Center (CHE-1305124) and the Welch Foundation (F-0021). H.S.A. was partially supported by Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT & Future Planning (NRF-2017R1C1B2011074) and by the Institute for Basic Science (Project Code IBS-R026-D1).

Publisher Copyright:
© 2017 American Chemical Society.

All Science Journal Classification (ASJC) codes

Analytical Chemistry

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10.1021/acs.analchem.7b02799

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title = "Assessment of the Stability and Operability of Cobalt Phosphide Electrocatalyst for Hydrogen Evolution",

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).",

author = "Ahn, {Hyun S.} and Bard, {Allen J.}",

note = "Funding Information: The authors thank Dr. Juan F. Callejas and Prof. Raymond E. Schaak for helpful discussions during the inception of the project. This work was supported by NSF under the NSF Center (CHE-1305124) and the Welch Foundation (F-0021). H.S.A. was partially supported by Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT & Future Planning (NRF-2017R1C1B2011074) and by the Institute for Basic Science (Project Code IBS-R026-D1). Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

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doi = "10.1021/acs.analchem.7b02799",

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AU - Ahn, Hyun S.

AU - Bard, Allen J.

N1 - Funding Information: The authors thank Dr. Juan F. Callejas and Prof. Raymond E. Schaak for helpful discussions during the inception of the project. This work was supported by NSF under the NSF Center (CHE-1305124) and the Welch Foundation (F-0021). H.S.A. was partially supported by Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT & Future Planning (NRF-2017R1C1B2011074) and by the Institute for Basic Science (Project Code IBS-R026-D1). Publisher Copyright: © 2017 American Chemical Society.

PY - 2017/8/15

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N2 - 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).

AB - 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).

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

Abstract

Bibliographical note

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