Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Engineering and Applied Sciences, Joint Center for Artificial Photosynthesis
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis; California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering; California Inst. of Technology (CalTech), Pasadena, CA (United States). Kavli Nanoscience Inst.; California Inst. of Technology (CalTech), Pasadena, CA (United States). Beckman Inst.
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, η of -η < 100 mV at a current density of -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. Lastly, operando analysis indicated that the active electrocatalyst was primarily amorphous and predominantly consisted of near-zerovalent Co as well as reduced P.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH)
- Grant/Contract Number:
- AC02-05CH11231; SC0004993; AC02-76SF00515
- OSTI ID:
- 1398516
- Journal Information:
- Journal of the American Chemical Society, Vol. 139, Issue 37; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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