Citation: CHEN Zhao-Yang, ZHAO Feng-Ming, MA Chun-An, QIAO Yun. Ultrasonic-Assisted Preparation of Bimodal Mesoporous HollowGlobal Tungsten Carbide and Its Electrocatalytic Performance[J]. Acta Physico-Chimica Sinica, ;2010, 26(09): 2569-2574. doi: 10.3866/PKU.WHXB20100906 shu

Ultrasonic-Assisted Preparation of Bimodal Mesoporous HollowGlobal Tungsten Carbide and Its Electrocatalytic Performance

1.
State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology, International Science&Technology Cooperation Base of Energy Materials and Application, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China

Received Date: 15 January 2010
Available Online: 9 July 2010
Fund Project: 浙江省重大科技专项国际合作项目(2008C14040) (2008C14040)浙江省自然科学基金重点项目(Z4100790) (Z4100790)国家自然科学基金(20476097)资助 (20476097)

Hollowspherical ammoniummetatungstate (AMT), as a precursor, was prepared by an ultrasonic method. Tungsten carbide (WC) was prepared by a gas-solid reaction in an atmosphere of CO/H₂ at 700-900^oC. Microspheres were fractured by ultrasonic dispersion for 1 h. X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry-differential thermal analysis (TG-DTA), Brunauer-Emmett-Teller (BET) surface area, and Barrett- Joyner-Halenda (BJH) pore-size distribution were used to characterize the morphology, mesoporous structure, and thermal stability of the sample. The results indicate that the sample is pure WC. The WC sample is stable in air at 410 ^oC and the mesopores of WC were centered at 4 nm and 22 nm. A WC powder microelectrode (WC-PME) was prepared using the prepared WC powders. The activity of WC for the electroreduction of nitrobenzene was studied by cyclic voltammetry (CV). The results indicate that the bimodal porosity of WC-PME led to higher catalytic activity than that of a Pt micro disc electrode (Pt-MDE). The reduction potential was 30 mV more positive than that of the Pt-MDE. The relation I_p-v^1/2 showed that the electrode reaction was controlled by liquid diffusion.
- Tungsten carbide,
- Ultrasonic-assistance,
- Mesoporous,
- Electrocatalysis
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沈阳化工大学材料科学与工程学院沈阳 110142