Effect of Ag2S Nanocrystals/Reduced Graphene Oxide Interface on Hydrogen Evolution Reaction

Catalysts

Hicham Idriss¹  Hao Zhang²  Huiwen Liu²  Chunlei Guo³  Chen Zhao⁴  Jun Xing⁴  Weili Yu⁴  Zhi Yu⁴  Yuting Zou⁴ 

[1] SABIC-CRD, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China;The Institute of Optics, University of Rochester, Rochester, NY 14627, USA;The Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;

关键词: HER;    Ag₂S nanocrystals;    reduced graphene oxide (rGO);    electrocatalyst;    composites;   

DOI  :  10.3390/catal10090948

来源: DOAJ

【 摘 要 】

The development of efficient electrocatalyst to produce molecular hydrogen from water is receiving considerable attention, in an effort to decrease our reliance on fossil fuels. The prevention of the aggregation of active sites during material synthesis, in order to increase charge transport properties of electrocatalysts, is needed. We have designed, synthesized, and studied a Ag₂S/reduced graphene oxide (rGO) electrochemical catalyst (for hydrogen evolution) from water. The Ag₂S nanocrystals were synthesized by the solvothermal method in which the rGO was added. The addition of the rGO resulted in the formation of smaller Ag₂S nanocrystals, which consequently increased the electrical conductivity of the composite catalyst. The composite catalyst showed a higher electrochemical catalytic activity than the one with an absence of rGO. At a current density of 10 mA/cm², a low overpotential of 120 mV was obtained. A Tafel slope of 49.1 mV/dec suggests a Volmer–Herovsky mechanism for the composite catalyst. These results may provide a novel strategy for developing hydrogen evolution reaction (HER) electrocatalysts, via the combining of a nano-semiconductor catalyst with a 2D material.

【 授权许可】

Unknown