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

被引：208

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

页数：11

共 70 条

[61] Metal Oxide-Supported Platinum Overlayers as Proton-Exchange Membrane Fuel Cell Cathodes [J].