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

Saadi, Fadl H. and Carim, Azhar I. and Drisdell, Walter S. and Gul, Sheraz and Baricuatro, Jack H. and Yano, Junko and Soriaga, Manuel P. and Lewis, Nathan S. (2017) Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction. Journal of the American Chemical Society, 139 (37). pp. 12927-12930. ISSN 0002-7863. doi:10.1021/jacs.7b07606.

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Transition metal phosphides exhibit high catalytic activity towards the electrochemical hydrogen-evolution reaction (HER) and resist chemical corrosion in acidic solutions. For example, an electrodeposited CoP catalyst exhibited an overpotential, η, of -η < 100 mV at a current density of -10 mA cm^(-2) in 0.500 M H_2SO_4(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 H_2SO_4(aq). Ex-situ analysis using the tandem spectroscopies indicated the presence of multiple ordered and disordered phases that contained both near-zero valent 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-zero-valent Co as well as reduced P.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Saadi, Fadl H.0000-0003-3941-0464
Carim, Azhar I.0000-0003-3630-6872
Drisdell, Walter S.0000-0002-8693-4562
Gul, Sheraz0000-0001-8920-8737
Yano, Junko0000-0001-6308-9071
Soriaga, Manuel P.0000-0002-0077-6226
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2017 American Chemical Society. Received: July 20, 2017; Published: August 28, 2017. This work was based on work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the U.S. Department of Energy Office of Science under Award Number DE-SC0004993. Synchrotron measurements were performed at beamlines 7-3 and 14-3 at the Stanford Synchrotron Radiation Lightsource at SLAC National Accelerator Laboratory, which is operated by Stanford University for the U.S. Department of Energy Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515, and supported by the Office of Biological and Environmental Research, and by the NIH including P41GM103393. A.I.C. acknowledges a Graduate Research Fellowship from the National Science Foundation. The authors gratefully acknowledge R. Jones and Dr. K. Walczak for assistance with spectroelectrochemical cell fabrication. The authors declare no competing financial interests.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Department of Energy (DOE)DE-AC02-76SF00515
NSF Graduate Research FellowshipUNSPECIFIED
Issue or Number:37
Record Number:CaltechAUTHORS:20170829-095313751
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Official Citation: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, and Nathan S. Lewis Journal of the American Chemical Society 2017 139 (37), 12927-12930 DOI: 10.1021/jacs.7b07606
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80895
Deposited By: Tony Diaz
Deposited On:29 Aug 2017 19:26
Last Modified:15 Nov 2021 19:39

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