Hierarchical MnO2/rGO hybrid nanosheets as an efficient electrocatalyst for the oxygen reduction reaction. (16th March 2016)

• Record Type: Journal Article
• Authors: Guo, Di; Dou, Shuo; Li, Xiu; Xu, Jiantie; Wang, Shuangyin; Lai, Linfei; Liu, Hua Kun; Ma, Jianmin; Dou, Shi Xue
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 10(2016)
• Page Start: 5260
• Page End: 5268
• Publication Date: 2016-03-16
• Subjects: MnO2 -- Graphene -- Nanosheet -- Oxygen reduction reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.01.070
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Electrocatalysts for the oxygen reduction reaction (ORR) play a crucial role in renewable-energy technologies, including metal-air batteries and fuel cells. However, development of novel catalysts with high activity and low cost remains a great challenge. Here, we present hierarchical MnO2 /reduced graphene oxide (MnO2 /rGO) hybrid nanosheets by using a facile method and study its electrocatalytic performance. Cyclic voltammograms, and rotating disk electrode and rotating ring/disk electrode measurements demonstrate that the hierarchical MnO2 /rGO hybrid nanosheets exhibit excellent electrocatalytic activity for the ORR in an alkaline medium, as evidenced by their higher cathodic current density, more positive onset potential, lower H2 O2 yield, and higher electron transfer number compared to pure rGO. The excellent catalytic activity of the MnO2 /rGO hybrid nanosheets highlights the importance of the synergetic chemical coupling effect between the ultrathin MnO2 nanosheets and the graphene layer. Graphical abstract: Highlights: Hierarchical MnO2 /rGO nanosheets as an efficient catalyst for ORR are fabricated. The excellent catalytic activity is attributed to the synergetic effect. Positive onset potential and high electron transfer number are demonstrated.