Kang Yu-Min, Yang Wein-Duo
Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Sanmin District, Kaohsiung City 807, Taiwan.
Nanomaterials (Basel). 2023 Jul 12;13(14):2060. doi: 10.3390/nano13142060.
Chitosan, a biomass raw material, was utilized as a carbon skeleton source and served as a nitrogen (N) atom dopant in this study. By co-doping phosphorus (P) atoms from HPO and nitrogen (N) atoms with a carbon (C) skeleton and hybridizing them with MnO on a carbon fiber cloth (CC), an MnO@NPC/CC electrode was fabricated, which exhibited an excellent capacitive performance. The N, P-codoped carbon polycrystalline material was hybridized with MnO during the chitosan carbonization process. This carbon polycrystalline structure exhibited an enhanced conductivity and increased mesopore content, thereby optimizing the micropore/mesopore ratio in the electrode material. This optimization contributed to the improved storage, transmission, and diffusion of electrolyte ions within the MnO@NPC electrode. The electrochemical behavior was evaluated via cyclic voltammetry and galvanostatic charge-discharge tests using a 1 M NaSO electrolyte. The capacitance significantly increased to 256.8 F g at 1 A g, and the capacitance retention rate reached 97.3% after 5000 charge/discharge cycles, owing to the higher concentration of the P-dopant in the MnO@NPC/CC electrode. These findings highlight the tremendous potential of flexible supercapacitor electrodes in various applications.
壳聚糖作为一种生物质原料，在本研究中被用作碳骨架源并作为氮（N）原子掺杂剂。通过将来自HPO的磷（P）原子与氮（N）原子与碳（C）骨架共掺杂，并使其与碳纤维布（CC）上的MnO杂化，制备了MnO@NPC/CC电极，该电极表现出优异的电容性能。在壳聚糖碳化过程中，N、P共掺杂的碳多晶材料与MnO发生杂化。这种碳多晶结构表现出增强的导电性和增加的中孔含量，从而优化了电极材料中的微孔/中孔比。这种优化有助于改善MnO@NPC电极内电解质离子的存储、传输和扩散。使用1 M NaSO电解质通过循环伏安法和恒电流充放电测试对电化学行为进行了评估。由于MnO@NPC/CC电极中P掺杂剂的浓度较高，在1 A g时电容显著增加到256.8 F g，在5000次充放电循环后电容保持率达到97.3%。这些发现突出了柔性超级电容器电极在各种应用中的巨大潜力。
