期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15802
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资金
- Royal Society [NA140367]
- University of Cape Town
- EPSRC H2FC SUPERGEN [EP/J016454/1]
- HySA/Catalysis Programme
- STFC [ST/K00171X/1, ST/N002385/1]
- HySA/Catalysis Centre of Competence (UCT)
- Department of Chemistry (UoS)
- EPSRC [EP/K040375/1]
- Engineering and Physical Sciences Research Council [EP/J013501/1, EP/F034296/1, EP/K040375/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/N002385/1, ST/K00171X/1] Funding Source: researchfish
- EPSRC [EP/F034296/1, EP/J016454/1, EP/J013501/1, EP/K040375/1] Funding Source: UKRI
- STFC [ST/N002385/1, ST/K00171X/1] Funding Source: UKRI
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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