MoS2/Nitrogen-doped graphene as efficient electrocatalyst for oxygen reduction reaction

• 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.

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.

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.Figure optionsDownload as PowerPoint slide