还原剂浓度对纳米VO2(B)微结构及其电化学性能的影响
Effect of reducing agent concentration on microstructure and electrochemical properties of Nano-VO2(B)
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摘要: 以V2O5为原料、草酸为还原剂,采用水热法制备不同草酸浓度下的系列纳米VO2(B)样品(c(H2C2O4)/c(V2O5)=x,1.00≤x≤2.50),对所制备样品的物相结构、微观形貌和电化学性能进行表征和分析.结果表明:所制备的样品均为单斜结构的纯相VO2(B);随着还原剂浓度的增大,VO2(B)样品的形貌逐渐由较小的纳米片变成较长的纳米棒;VO2(B)样品的结构缺陷主要为微孔;所得VO2(B)样品均具有较好的可逆性和循环稳定性,其中,当x=1.75时,VO2(B)样品具有较小的氧化还原峰电位差(0.111 V)和较小的电阻(0.770 Ω),且当电流密度为30 mA/g时,具有最大的比电容值(105.00 F/g),表现出更好的电化学性能.Abstract: Using V2O5 as raw material, oxalic acid as reducing agent, a series of nano-VO2 (B) samples with different oxalic acid concentrations (c(H2C2O4)/c(V2O5)=x,1.00≤x≤2.50) were prepared by hydrothermal method. The structure, micro-morphology and electrochemical performance of the prepared samples were characterized and analyzed. The results showed that the prepared samples were all pure phase VO2 (B) with monoclinic structure; with the increase of the concentration of reducing agent, the morphology of the VO2 (B) sample gradually changed from smaller nanoplates to larger nanorods; the structural defects of VO2 (B) samples were mainly micropores; the obtained VO2 (B) samples all had good cycle stability and reversibility. Among them, the VO2 (B) sample obtained with x=1.75 had smaller redox peak potential difference (0.111 V) and smaller resistance (0.770 Ω), and when the current density was 30 mA/g, the VO2 (B) sample had the largest specific capacitance value, 105.00 F/g, showing better electrochemical performance.
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Key words:
- Nano-VO2(B) /
- micromorphology /
- structural defect /
- electrochemical property
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