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

被引:192
作者
Jackson, Colleen [1 ]
Smith, Graham T. [1 ,2 ]
Inwood, David W. [3 ]
Leach, Andrew S. [3 ]
Whalley, Penny S. [3 ]
Callisti, Mauro [2 ]
Polcar, Tomas [2 ]
Russell, Andrea E. [3 ]
Levecque, Pieter [1 ]
Kramer, Denis [2 ]
机构
[1] Univ Cape Town, Catalysis Inst, Dept Chem Engn, HySA Catalysis, Corner Madiba Circle & South Lane, ZA-7701 Rondebosch, South Africa
[2] Univ Southampton, Engn Sci, Univ Rd, Southampton SO17 1BJ, Hants, England
[3] Univ Southampton, Dept Chem, Univ Rd, Southampton SO17 1BJ, Hants, England
来源
NATURE COMMUNICATIONS | 2017年 / 8卷
基金
英国工程与自然科学研究理事会;
关键词
RAY-ABSORPTION SPECTROSCOPY; FUEL-CELL CATALYSTS; ALLOY ELECTROCATALYSTS; WORK FUNCTION; CHARGE-TRANSFER; PT-ALLOY; SURFACE; DURABILITY; SIZE; NANOPARTICLES;
D O I
10.1038/ncomms15802
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
收藏
页数:11
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