MnO2纳米片功能化修饰的氮掺杂碳纤维电化学性能研究

Study on Electrochemical Performance of Nitrogen-doped Carbon Fiber Functionally Modified by MnO2 Nanosheets

中文关键词:  细菌纤维素  MnO₂  氮掺杂  电化学性能

Key Words:bacterial cellulose  MnO₂  nitrogen doping  electrochemical performance

中文摘要:

      以细菌纤维素（BC）为模板原位生长聚吡咯，再将其高温碳化以得到高导电性能的氮掺杂碳纤维（NCF），通过水热反应将MnO₂纳米片修饰到NCF表面，形成核壳结构的MnO₂纳米片包裹氮掺杂碳纤维（NCF/MnO₂），并对其进行理化分析。结果表明，相对于纯δ-MnO₂，NCF/MnO₂具有更优异的电化学性能，在1 A/g的电流密度下，其比电容达到193.2 F/g；在10 A/g的电流密度下进行10000次恒流充放电后，其比电容保持率为107%，具有优异的循环稳定性；NCF的引入能极大提高MnO₂电化学性能，为MnO₂电极材料的发展提供理论依据。

Abstract:

      Bacterial cellulose （BC） was used as template to grow polypyrrole in situ which was then carbonized at high temperature to prepare nitrogen-doped carbon fiber （NCF） with high conductivity. The surface of the as-prepared NCF was modified by MnO₂ nanosheets through hydrothermal reaction to obtain a core-shell-structured nitrogen-doped carbon fiber （NCF/MnO₂） which was then subjected to physical and chemical analysis. The results showed that compared with pure δ-MnO₂， NCF/MnO₂ was of better electrochemical performance： the specific capacitance of which reached 193.2 F/g at current density of 1 A/g； the specific capacitance retention rate was 107% after constant current charging-discharging cycles of 10000 （current density of 10 A/g）， exhibiting excellent cycling stability. Therefore， the introduction of NCF can greatly improve the electrochemical performance of MnO₂ and the results of which provide a research basis for the development of MnO₂ electrode materials.