文献类型：期刊文献

英文题名：Cobalt and Iron Oxides Co-supported on Carbon Nanotubes as an Efficient Bifunctional Catalyst for Enhanced Electrocatalytic Activity in Oxygen Reduction and Oxygen Evolution Reactions

作者：Zhao, Ye-Min[1];Wang, Fei-Fei[1];Wei, Ping-Jie[1];Yu, Guo-Qiang[1];Cui, Shi-Cong[1];Liu, Jin-Gang[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2018

卷号：3

期号：1

起止页码：207

外文期刊名：CHEMISTRYSELECT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000419480300029)】；

基金：This study was financially supported by the NSF of China (no. 21571062, 21271072 to JGL; 21503080 to PJW), the Program for Professor of Special Appointment (Eastern Scholar) at the Shanghai Institutions of Higher Learning to JGL, and the Fundamental Research Funds for the Central Universities (no. 222201717003).

语种：英文

外文关键词：cobalt oxides; iron oxide; metal-organic frameworks; oxygen evolution reaction; oxygen reduction reaction

摘要：Developing efficient non-precious metal electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in energy conversion and storage devices is highly desirable but challenging. This report describes a general approach for preparing cobalt and iron oxide nanoparticles co-supported on nitrogen-doped carbon materials as an efficient oxygen electrode catalyst with an improved catalytic activity toward OER and ORR; these nanoparticles were obtained through pyrolysis of Co- and Fe-based metal-organic frameworks grown directly on the surface of polyvinylimidazole-functionalized carbon nanotubes (CNTs). The Fe/Co-CNTs-800 catalyst pyrolyzed at 800 degrees C exhibited high electrocatalytic activity for ORR, with only approximate to 50mV lesser activity than that of Pt/C at the half-wave potential, and for OER, with only approximate to 70mV lesser activity than that of RuO2 at a current density of 10mAcm(-2) in a 0.1M KOH solution. The potential difference between OER and ORR for Fe/Co-CNTs-800 (EOER-ORR) was 0.905V, which was significantly lower than that for noble-metal catalysts (20wt% Pt/C (1.137V) and RuO2 (1.341V)). The preparation temperature and value of Fe/Co in the catalyst composite are crucial for achieving high electrocatalytic activity for both ORR and OER.