MoS2/Nitrogen-doped graphene as efficient electrocatalyst for oxygen reduction reaction. (1st July 2015)

• Record Type: Journal Article
• Authors: Zhao, Kai; Gu, Wei; Zhao, Longyun; Zhang, Cuiling; Peng, Weidong; Xian, Yuezhong
• Is Part Of: Electrochimica acta. Volume 169(2015)
• Page Start: 142
• Page End: 149
• Publication Date: 2015-07-01
• Subjects: Nitrogen-doped graphene -- MoS2 sheets -- Composite -- Electrocatalyst -- Oxygen reduction reaction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.04.044
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: A simple yet effective method was developed for generating an electrocatalyst for oxygen reduction reaction by deposited MoS2 sheets on nitrogen-doped graphene (NG). Due to the synergistic effect of MoS2 and NG, enhancement of electrocatalytic oxygen-reduction was realized. Highlights: MoS2 /Nitrogen-doped graphene (NG) composites were obtained by physically mixing method. MoS2 sheets deposited NG could be used as effective electrocatalyst for ORR. Enhanced electrocatalytic activity is due to the synergistic effect of MoS2 and NG. The ORR is a four-electron process based on Koutecky-Levich equation. Abstract: A simple yet effective strategy was developed to generate a non-precious oxygen electrode electrocatalyst of MoS2 /nitrogen-doped graphene (NG) by physical mixing MoS2 sheets with NG. The micrometer-sized MoS2 sheets were obtained through ultrasonication exfoliation of the bulk MoS2, only showing little oxygen reduction reaction (ORR) activity. MoS2 /NG hybrid was obtained by loading MoS2 sheets onto NG through ultrasonication, and the resulting nanocomposites exhibited improved electrocatalytic activity for ORR with dominant 4 electron pathway in alkaline solutions. The exposed active edges as well as the synergistic effect and reduced resistance connection jointly make the MoS2 /NG composite a highly competitive ORR catalyst.