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论文类型：期刊论文

发表时间：2018-08-30

发表刊物：APPLIED SURFACE SCIENCE

收录刊物：SCIE

卷号：450

页面范围：244-250

ISSN号：0169-4332

关键字：Core-shell; PtRu/C; h-BN; CO-tolerance; Proton exchange membrane fuel cell; Confinement effect

摘要：PtRu alloy nanoparticles (NPs) in a commercial PtRu/C catalyst were encapsulated within few-layer graphitic boron nitride (h-BN) shells to form PtRu@h-BN/C core-shell catalysts, which were used as CO-tolerant anode catalyst in proton exchange membrane fuel cells (PEMFCs). Electrochemical results reveal that the PtRu@h-BN/C catalysts show similar activity in hydrogen oxidation reaction (HOR) as the PtRu/C catalysts but present enhanced CO-tolerance in fuel cell tests. Single cell performance with the PtRu@h-BN/C catalyst has been lowered by less than 20% with 30 ppm CO/25% CO2 introduced into H-2 feed gas, while the PtRu/C catalyst suffers from a decrease of 60% under the same conditions. The reaction data and characterization results suggest that h-BN ultrathin shells can achieve a good balance between durability and activity, enabling the PtRu@h-BN/C material to act as a potential anode catalyst for PEMFCs. (C) 2018 Elsevier B. V. All rights reserved.