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Biomass Chemical Engineering ›› 2021, Vol. 55 ›› Issue (2): 16-22.doi: 10.3969/j.issn.1673-5854.2021.02.003

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Structural Properties of Niobium Oxide/Woody Activated Carbon Fiber Composites

Xin LIU, Xiaojun MA()   

  1. College of Light Industry Science and Engineering, Tianjin University of Science and Technology, Tianjin 300222, China
  • Received:2020-01-13 Online:2021-03-30 Published:2021-03-23
  • Contact: Xiaojun MA E-mail:mxj75@tust.edu.cn


Niobium oxide/wood activated carbon fiber (Nb2O5/ACHF) at different calcination temperatures(400, 600 and 800 ℃) was prepared by impregnating niobium oxalate and changing calcination temperature with wood activated carbon fiber as support. The structure, surface pore size and so on of the as-prepared niobium oxide/wood activated carbon fiber were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray electron spectroscopy (XPS) and fully automatic surface area and pore size analysis (BET), and the electrochemical performance was preliminarily analyzed. The results showed that as the calcination temperature increased, the crystal form of the orthogonal niobium oxide crystal on the surface of the fiber became better, and the particle diameter became larger. The C-C bond content of the surface functional group decreased gradually, and the C-O bond increased, The specific surface area decreased from 1 476.65 m2/g(400 ℃) to 1 302.31 m2/g(800 ℃). The micropore rate decreased by 10.79 percent. In addition, the prepared niobium oxide/wood activated carbon fiber had excellent double layer capacitance and pseudocapacitance properties. The Nb2O5/ACHF-800 surface of 800 ℃ calcined sample had multistage pore structure. In favor of its electrochemical performance, the specific capacitance was up to 155 F/g in KOH electrolyte with the current density of 1 A/g.

Key words: wood activated carbon fiber, niobium oxide, XPS, specific surface area, specific capacitance

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