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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