Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2886.doi: 10.7503/cjcu20210258

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of NiOx-ZSM-5 Composite Materials and Its Electrocatalytic Hydrogen Evolution Performance in Microbial Electrolysis Cell

GAO Xiaole, WANG Jiaxin, LI Zhifang, LI Yanchun, YANG Donghua()   

  1. School of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2021-04-19 Online:2021-09-10 Published:2021-09-08
  • Contact: YANG Donghua E-mail:ydh1962@163.com
  • Supported by:
    the Transformation and Cultivation of Scientific and Technological Achievements Project of Higher Education Institutions in Shanxi Province, China(2020CG016)

Abstract:

ZSM-5 molecular sieves were synthesized by adding carbon spheres into Na2O-TPABr-Al2O3-SiO2-H2O sol reaction system with hydrothermal crystallization method, then loaded different nickel-salts to prepare NiOx-ZSM-5 composites. The samples were characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), nitrogen adsorption-desorption isotherms and electrochemical tests. In addition, their catalytic hydrogen evolution performances were evaluated by the microbial electrolytic cell(MEC). The results show that the ZSM-5 molecular sieves composed of stacked ZSM-5 nanoparticles under the action of carbon spheres are ellipsoidal morphology, which mesoporous specific surface area and mesoporous pore volume have significantly increased. After immersion and roasting, the speckled NiOx nanoparticles are covered the mesoporous surface formed by the crystal gap and the surface of the molecular sieve. Compared with pure NiO, the composites with 40% nickel-salts show that the absorption peak of multivalent nickels and oxygen shift to the high energy direction. Eventually the electrocatalytic activities are significantly improved by increasing active sites of multivalent nickel, aluminum atoms and oxygen vacancies, the composites exhibit high current density(8.45 mA/cm2) and low overpotential(151 mV). During the MEC operation cycle, the average hydrogen evolution current density of the composite is (28.64±7.4) A/m2, the total gas production is (52.67±1.64) mL, and the H2 purity is (89.07±0.06)%. The hydrogen evolution efficiency(0.571 m3?m-3?d-1) and coulombic efficiency[(76.7±5.4)%] of composite cathode are similar to Pt/C cathode, indicating that the composite is a low cost and high efficiency hydrogen evolution material, which offers a possible alternative to Pt cathode.

Key words: Microbial electrolytic cell, NiOx-ZSM-5 composite, Hydrogen evolution efficiency, Cathode material

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