J. Mater. Sci. Technol. ›› 2020, Vol. 49: 144-156.DOI: 10.1016/j.jmst.2020.02.025

• Research Article • Previous Articles     Next Articles

Performance of Ni-Cu bimetallic co-catalyst g-C3N4 nanosheets for improving hydrogen evolution

Zhiliang Jina,b,c,*(), Lijun Zhanga,b,c,*()   

  1. a School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, China
    b Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, China
    c Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, China
  • Received:2019-11-16 Revised:2019-12-13 Accepted:2019-12-17 Published:2020-07-15 Online:2020-07-17
  • Contact: Zhiliang Jin,Lijun Zhang

Abstract:

The Ni-Cu bimetallic nanoparticles were successfully anchorred on the surface of g-C3N4 nanosheets by a simple heat treatment process which was applied to the photocatalytic hydrogen evolution reaction. In-situ introduction of Ni-Cu could significantly improve the photocatalytic hydrogen evolution performance compared with pure g-C3N4 in the system sensitized by eosin Y under a visible irradiation condition. The hydrogen production activity of the composite reached 104.4 μmol (2088.28 μmol g-1 h-1) after using the Ni—Cu double promoter strategy, which was 24.3 times higher than g-C3N4. The excellent electrical conductivity of the bimetallic Ni-Cu and the close interfacial contact between Ni—Cu and g-C3N4 played an important role for increasing the charge transfer rate. They were also the reasons of more efficient charge separation, which ultimately led to a significant promotion on the photocatalytic hydrogen production reaction. Ni-Cu/g-C3N4 coupling with a close Schottky interface between metal and semiconductor which enhanced H2-evolution performance and TEOA oxidation kinetics. This work provided a new way to load Ni—Cu bimetallic nanoparticles in situ onto g-C3N4 and a reference on relative semiconductor materials.

Key words: Bimetallic, Ni-Cu, g-C3N4, Charge separation, Hydrogen evolution