Facile Synthesis of In–Situ Nitrogenated Graphene Decorated by Few–Layer MoS2 for Hydrogen Evolution Reaction. (20th July 2015)

• Record Type: Journal Article
• Authors: Dai, Xiaoping; Li, Zhanzhao; Du, Kangli; Sun, Hui; Yang, Ying; Zhang, Xin; Ma, Xingyu; Wang, Jie
• Is Part Of: Electrochimica acta. Volume 171(2015)
• Page Start: 72
• Page End: 80
• Publication Date: 2015-07-20
• Subjects: Few-layer MoS2 nanosheets -- graphene -- hydrothermal co-reduction -- in–situ Nitrogen doping -- hydrogen evolution reaction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.05.017
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: In–situ nitrogenated graphene–few layer MoS2 composites are fabricated by combinating chemical and hydrothermal reduction. The resulting MoS2 /N–rGO–HA by N2 H4 ·H2 O and NH3 ·H2 O as co-reductant exhibits high activity and remarkable stability for hydrogen evolution reaction (HER). The excellent electro-catalytic performance is ascribed to the synergistic effects, confinement effects and highly dispersed MoS2 nanosheets on N-doping rGO. Highlights: In–situ nitrogenated graphene–few layer MoS2 composites are fabricated by combinating chemical and hydrothermal co-reduction. The resulting MoS2 /N–rGO–HA exhibits high activity and remarkable stability for HER. The excellent electro-catalytic performance is ascribed to the synergistic effects, confinement effects and highly dispersed MoS2 nanosheets on N-doping rGO. Abstract: A facile one–step synthetic strategy by combinating chemical and hydrothermal reduction of graphene oxide and Mo precursor is proposed to fabricate in–situ nitrogenated graphene–few layer MoS2 composite (MoS2 /N–rGO–HA) for hydrogen evolution reaction (HER). The N–doping graphene nanosheets and highly dispersed MoS2 nanosheets by ammonia and hydrozine as co–reductant have greatly promoted the N content, concentrations of pyridinic and graphitic N, the electron transport in electrodes, and assure high catalytic efficiency. The MoS2 /N–rGO–HA composite exhibits extremely high activity in acidic solutions with a small onset potential of 100 mV and Tafel slope of 45 mV/dec, as well as a current density about 32.4 mA cm −2 at overpotential about 0.2 V. Moreover, such MoS2 /N–rGO–HA electroncatalyst also shows an excellent stability during 1000 cycles with negligible loss of the cathodic current. This facile hydrothermal method could provide a promising strategy for the synthesis of in–situ nitrogen–doping graphene sheets and few–layer MoS2 composites in large scale towards promising alternative catalyst for platinum–based HER electrocatalysts.