Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 22, Pages 7071-7074Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b04142
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Funding
- U.S. Army Research Laboratory
- U.S. Army Research Office under the Multi University Research Initiative (MURI) [W911NF-11-1-0353]
- U.S. Army Research Office [W911NF-15-1-0147]
- Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
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Monodisperse cobalt (Co) nanoparticles (NPs) were synthesized and stabilized against oxidation via reductive annealing at 600 degrees C. The stable Co NPs are active for catalyzing the oxygen evolution reaction (OER) in 0.1 M KOH, producing a current density of 10 mA/cm(2) at an overpotential of 0.39 V (1.62 V vs RHE, no iR-correction). Their catalysis is superior to the commercial Ir catalyst in both activity and stability. These Co NPs are also assembled into a monolayer array on the working electrode, allowing the detailed study of their intrinsic OER activity. The Co NPs in the monolayer array show 15 times higher turnover frequency (2.13 s(-1)) and mass activity (1949 A/g) than the NPs deposited on conventional carbon black (0.14 s(-1) and 126 A/g, respectively) at an overpotential of 0.4 V. These stable Co NPs are a promising new class of noble-metal-free catalyst for water splitting.
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