文献类型：期刊文献

英文题名：A copper complex covalently grafted on carbon nanotubes and reduced graphene oxide promotes oxygen reduction reaction activity and catalyst stability

作者：Wang, Ru-Chun[1];Yin, Tian-Liang[1];Wei, Ping-Jie[1];Liu, Jin-Gang[1]

机构：[1]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2015

卷号：5

期号：81

起止页码：66487

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20153201158073);WOS:【SCI-EXPANDED(收录号:WOS:000359243000099)】；

基金：This study was financially supported by the NSF of China (no. 21271072), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and sponsored by Shanghai Pujiang Program (no. 13J1401900).

语种：英文

外文关键词：Catalyst selectivity - Fuel cells - Electrolytic reduction - Catalyst activity - Grafting (chemical) - Coordination reactions - Graphene - Oxygen - Yarn - Copper compounds - Electrocatalysts - Precious metals

摘要：Developing new non-precious-metal catalysts for the oxygen reduction reaction (ORR) is very important to the final substitution of a platinum-based noble metal catalyst for large-scale commercialization of fuel cells. Herein, we report two new composites CNTs-TAmPyCu and rGO-TAmPyCu as ORR electrocatalysts, where a triazole-pyridine coordinated copper complex TAmPyCu was covalently grafted onto multi-walled carbon nanotubes (CNTs) and reduced graphene oxide (rGO), respectively. Covalent immobilization of a copper complex on CNTs or rGO remarkably improves the catalyst ORR activity and stability compared with that of the physisorbed counterparts. Furthermore, the rGO-TAmPyCu composite significantly enhanced the selectivity of 4e(-) versus 2e(-) reduction of O-2 relative to the CNTs-TAmPyCu catalyst, suggesting the beneficial effect of the flat rGO as a supporting material for copper complexes. The ORR activity of the rGO-TAmPyCu catalyst was also compared with a reported multinuclear copper assembly. The results from this study suggest that creating more proximal dinuclear Cu sites on a support is an effective approach to promote the oxygen 4e(-) reduction process, and a multinuclear Cu assembly is crucial for efficient O-2 reduction with impressively lowered overpotential.