Facile synthesis of Co-N-rGO composites as an excellent electrocatalyst for oxygen reduction reaction
MetadataShow full item record
© 2018 Elsevier Ltd Cobalt and nitrogen co-doped reduced graphene oxide (Co-N-rGO) composites are prepared by a facile low-temperature hydrothermal method. Structure characterization reveals that cobalt and nitrogen are co-ordinately attached to the rGO sheets with the formation of covalent C-N and Co-O-C linkages. Cyclic voltammetry and linear sweep voltammetry show that the Co-N-rGO composite possesses higher electrocatalytic activity and four-electron selectivity for oxygen reduction reaction (ORR) as compared to the rGO, Co-rGO and N-rGO. In addition, the Co-N-rGO composite presents excellent stability and durability in alkaline medium comparable to commercial Pt/C. The edge plane CoN 2 /C, CoN 4 /C, and basal plane macrocyclic CoN 4 /C species within the Co-N-rGO structure are proposed to be the active sites performing catalysis in the ORR. The strong covalent linkages between the cobalt/nitrogen and rGO not only enable potent synergy of cobalt, nitrogen and rGO in catalysis, but also ensure structure stability of the composite. Due to the superior ORR activity of Co-N-rGO, high-temperature heat treatment is not able to improve its activity any more. The low-temperature hydrothermal method is anticipated to be used as a low-cost and facile preparation approach for ORR catalysts, and the superb ORR performance of Co-N-rGO endow it with great application potential in fuel cells, metal-air batteries and other ORR-related electrochemical industries.
Showing items related by title, author, creator and subject.
Graphene decorated with multiple nanosized active species as dual function electrocatalysts for lithium-oxygen batteriesWang, S.; Suo, Y.; Su, C.; Chen, Y.; Zhu, Y.; Shao, Zongping (2016)Development of an oxygen electrode with high stability and good electrochemical activity is critical to achieve the practical applications of rechargeable lithium-oxygen batteries (LOBs) in our daily life. here, we report ...
Hierarchically porous cobalt-carbon nanosphere-in-microsphere composites with tunable properties for catalytic pollutant degradation and electrochemical energy storageLiu, Yu; Wang, C.; Veder, Jean-Pierre; Saunders, M.; Tade, Moses; Wang, Shaobin; Shao, Zongping (2018)Unreliable energy supply and environmental pollution are two major concerns of the human society in this century. Herein, we report a rational approach on preparation of hierarchically-structured cobalt-carbon composites ...
Tian, Hu-Yong; Buckley, Craig; Paskevicius, Mark; Sheppard, Drew (2012)Hydrogen storage issues have been universally investigated in order to satisfy the goals for a hydrogen economy. Carbon aerogels are regarded as one of the most promising candidates for hydrogen storage at cryogenic ...