Hydrogen production over g-C3N4/Co3O4 colloidal catalyst enhanced by visible light
Zhang Xindong1,2, Feng Jinyang1, Fan Lijun1, Wang Yujing1,*, Chai Shouning2
1.School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,Shaanxi,China;
2.College of Science, Xi'an University of Architecture and Technology, Xi'an 710055,Shaanxi,China;
Abstract
g-C3N4/Co3O4colloidal catalyst with enhanced hydrogen production by visible light was prepared via hydrothermal-reduction process and characterized by XRD,TEM,SEM and EDS to investigate the component and morphology of catalyst.The results showed that g-C3N4/Co3O4 colloidal catalyst had premium catalytic activity for hydrogen production under visible light irradiation,and its TOF value was as high as 58.2 min-1.Activation energy of the catalyst was 15.73 kJ·mol-1 obtained by fitting temperature and kinetics curve.UV-vis and PL tests found that the composite catalyst had high light utilization rate and electron hole separation rate,which further illuminated mechanism of light improving catalytic activity.
图4 g-C3N4/Co3O4胶体催化剂在黑暗和光照条件下水解硼氢化钠产氢性能Figure 4 Hydrogen performance of g-C3N4/Co3O4catalyst for hydrolysis of NaBH4solution with and without light irradiation
图5 不同温度对g-C3N4/Co3O4胶体催化剂水解硼氢化钠产氢性能的影响及温度动力学曲线Figure 5 Effects of temperature on H2 generation and temperature dynamic curve over g-C3N4/Co3O4 catalyst
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