Zhao Shihang, Yu Xianbo, Chen Hongmei, Tao Kai, Hu Yaoping, Han Lei
School of Materials Science & Chemical Engineering, Ningbo University Ningbo Zhejiang 315211 China
Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo University Ningbo Zhejiang 315211 China.
RSC Adv. 2020 Apr 6;10(23):13922-13928. doi: 10.1039/d0ra01844a. eCollection 2020 Apr 1.
Uniform one-dimensional metal oxide hollow tubular nanofibers (HTNs) have been controllably prepared using a calcination strategy using electrospun polymer nanofibers as soft templates and zeolitic imidazolate framework nanoparticles as precursors. Utilizing the general synthesis method, the ZnO HTNs, CoO HTNs and ZnCoO HTNs have been successfully prepared. The optimal ZnCoO HTNs, as a representative substance applied in supercapacitors as the positive electrode, delivers a high specific capacity of 181 C g at a current density of 0.5 A g, an excellent rate performance of 75.14% and a superior capacity retention of 97.42% after 10 000 cycles. Furthermore, an asymmetric supercapacitor assembled from ZnCoO HTNs and active carbon also shows a stable and ultrahigh cycling stability with 95.38% of its original capacity after 20 000 cycle tests.
利用静电纺丝聚合物纳米纤维作为软模板、沸石咪唑酯骨架纳米颗粒作为前驱体，通过煅烧策略可控地制备了均匀的一维金属氧化物中空管状纳米纤维（HTNs）。采用通用合成方法，成功制备了ZnO HTNs、CoO HTNs和ZnCoO HTNs。作为应用于超级电容器正极的代表性物质，最优的ZnCoO HTNs在电流密度为0.5 A g时具有181 C g的高比容量、75.14%的优异倍率性能以及在10000次循环后97.42%的优异容量保持率。此外，由ZnCoO HTNs和活性炭组装而成的不对称超级电容器在20000次循环测试后也表现出稳定且超高的循环稳定性，其原始容量保持率为95.38%。
