Highly Active Electrocatalysis of the Hydrogen Evolution Reaction by Cobalt Phosphide Nanoparticles
Abstract
Nanoparticles of cobalt phosphide, CoP, have been prepared and evaluated as electrocatalysts for the hydrogen evolution reaction (HER) under strongly acidic conditions (0.50 M H_2SO_4, pH 0.3). Uniform, multi-faceted CoP nanoparticles were synthesized by reacting Co nanoparticles with trioctylphosphine. Electrodes comprised of CoP nanoparticles on a Ti support (2 mg cm^(−2) mass loading) produced a cathodic current density of 20 mA cm^(−2) at an overpotential of −85 mV. The CoP/Ti electrodes were stable over 24 h of sustained hydrogen production in 0.50 M H_2SO_4. The activity was essentially unchanged after 400 cyclic voltammetric sweeps, suggesting long-term viability under operating conditions. CoP is therefore amongst the most active, acid-stable, earth-abundant HER electrocatalysts reported to date.
Additional Information
© 2014 Wiley-VCH Verlag GmbH & Co. Received: February 20, 2014; Published online: April 11, 2014. This work was supported by the National Science Foundation (NSF) Center for Chemical Innovation on Solar Fuels (CHE-1305124). C.W.R. thanks the NSF for a graduate research fellowship. Research was in part performed at the Beckman Institute Molecular Materials Research Center. TEM and BET data were acquired using facilities in the Materials Characterization Lab of the Penn State Materials Research Institute. E.J.P. and C.G.R. thank Trevor Clark, Ke Wang, and Lymaris Ortiz Rivera for assistance.Additional details
- Eprint ID
- 46395
- DOI
- 10.1002/anie.201402646
- Resolver ID
- CaltechAUTHORS:20140620-100535755
- CHE-1305124
- NSF Center for Chemical Innovation on Solar Fuels
- NSF Graduate Research Fellowship
- Created
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2014-06-20Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- CCI Solar Fuels