期刊
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
卷 33, 期 10, 页码 771-778出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201600077
关键词
antipoisoning; AuCu alloys; core-shell; non-enzyme glucose biosensors; self-supporting
资金
- STCSM [12JC1401500]
Controlling the electronic structure of a catalyst has become an important approach to tune and optimize its antipoisoning ability and catalytic efficiency for a chemical reaction. Using d-mannitol as a structure-directing agent to induce size transformation and twinned defects in copper particles, penta-twinned Cu elongated pentagonal bipyramids as supports have been synthesized, and HAuCl4 is reduced in situ to form an AuCu alloy on the surface of Cu, generating a self-supporting AuCu@Cu core-shell structure for application as a glucose sensor in a neutral medium. The AuCu@Cu elongated pentagonal bipyramids with 0.42 at% Au show activities comparable with the Au and Pt catalyst but are more tolerant toward Cl- than Au and more tolerant toward H3-xPO4x- than Cu. The mass activity of AuCu@Cu reaches 0.10 A mg(-1) of Au at 0.6 V versus Ag/AgCl (3 m KCl) in a pH 8.0 buffer. The self-supporting AuCu@Cu elongated pentagonal bipyramids are promising catalysts for glucose sensing in a neutral medium. This work offers an effective way to design antitoxic and durable catalysts with ultralow content of noble metal for glucose sensing.
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