MnO2纳米片功能化修饰的氮掺杂碳纤维电化学性能研究

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/MnO)，并对其进行理化分析。结果表明，相对₂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。

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

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 pureδ-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.