Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 9, Issue 10, Pages 3290-3301Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ee01929c
Keywords
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Funding
- Department of Energy, Office of Basic Energy Sciences [DE-SC0016214]
- National Science Foundation [1122374]
- Swiss National Science Foundation [P2EZP2 159124]
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Most earth-abundant electrocatalysts suffer from negligible activity for the hydrogen oxidation reaction (HOR) and significant overpotentials for the hydrogen evolution reaction ( HER) in acidic media. We designed earth-abundant, carbon-supported titanium tungsten carbide (TixW1-xC) nanoparticles decorated with surface Pt coatings ranging from the single-atom'' to the two-monolayer regime. Reactivity studies demonstrated that sub-monolayer Pt coverages are optimal and could activate the exposed metal carbide sites for both HER and HOR at low overpotentials. Specifically, a 0.25 monolayer coverage of Pt improved the exchange current density of Ti0.2W0.8C by more than three orders of magnitude. This catalyst outperformed traditional Pt/C by a factor of 13 on a Pt mass basis, allowing for over a 96% reduction in Pt loadings. Deactivation was not observed after 10000 cycles between -50 and +600 mV vs. RHE in 1.0 M HClO4, and activity was maintained after 140000 catalytic turnovers. A technoeconomic analysis revealed that over the catalyst lifetime, this new architecture could reduce materials and energy costs by a factor of 6 compared to state-of-the-art earth-abundant catalysts and a factor of 12 compared to Pt/C.
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