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Electronic metal-support interaction enhanced oxygen reduction activity and stability of boron carbide supported platinum

Colleen JacksonHySA/Catalysis, Catalysis Institute, Department of Chemical Engineering, University of Cape Town, Corner of Madiba Circle and South Lane, Rondebosch 7701, South AfricaGraham T. SmithEngineering Sciences, University of Southampton, University Road, Southampton SO17 1BJ, UKDavid W. InwoodDepartment of Chemistry, University of Southampton, University Road, Southampton SO17 1BJ, UKAndrew S. LeachDepartment of Chemistry, University of Southampton, University Road, Southampton SO17 1BJ, UKPenny S. WhalleyDepartment of Chemistry, University of Southampton, University Road, Southampton SO17 1BJ, UKM. CallistiEngineering Sciences, University of Southampton, University Road, Southampton SO17 1BJ, UKTomáš PolcarEngineering Sciences, University of Southampton, University Road, Southampton SO17 1BJ, UKAndrea E. RussellDepartment of Chemistry, University of Southampton, University Road, Southampton SO17 1BJ, UKPieter LevecqueHySA/Catalysis, Catalysis Institute, Department of Chemical Engineering, University of Cape Town, Corner of Madiba Circle and South Lane, Rondebosch 7701, South AfricaDenis KramerEngineering Sciences, University of Southampton, University Road, Southampton SO17 1BJ, UK

2017en

ABI

Annotatsiya

Catalysing the reduction of oxygen in acidic media is a standing challenge. Although activity of platinum, the most active metal, can be substantially improved by alloying, alloy stability remains a concern. Here we report that platinum nanoparticles supported on graphite-rich boron carbide show a 50-100% increase in activity in acidic media and improved cycle stability compared to commercial carbon supported platinum nanoparticles. Transmission electron microscopy and x-ray absorption fine structure analysis confirm similar platinum nanoparticle shapes, sizes, lattice parameters, and cluster packing on both supports, while x-ray photoelectron and absorption spectroscopy demonstrate a change in electronic structure. This shows that purely electronic metal-support interactions can significantly improve oxygen reduction activity without inducing shape, alloying or strain effects and without compromising stability. Optimizing the electronic interaction between the catalyst and support is, therefore, a promising approach for advanced electrocatalysts where optimizing the catalytic nanoparticles themselves is constrained by other concerns.

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DOI: 10.1038/ncomms15802

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