Controllable Design and Preparation of Hollow Carbon-Based Nanotubes for Asymmetric Supercapacitors and Capacitive Deionization

作者：Hao Zhang, Fang Zhang, Yuquan Wei, Qiuci Miao, Aiyang Li, Yingshuang Zhao, Ying Yuan, Naifu Jin, Guanghe Li · 发表于：ACS Applied Materials & Interfaces · 年份：2021 · DOI：10.1021/acsami.1c01137 · 被引用次数：74 · 研究领域：Supercapacitor Materials and Fabrication、Membrane-based Ion Separation Techniques、Advanced Battery Materials and Technologies

Carbon-based materials are important desirable materials in areas such as supercapacitors and capacitive deionization. However, traditional commercial materials are heterogeneous and prone to agglomeration in nanoscale and have structural limitation of electrochemical and desalination performance due to poor transport channels and low capacitance of prepared electrodes. Here, we introduce the facile strategy for controllable preparation of two types of hollow carbon-based nanotubes (HCTs) with amorphous mesoporous structures, which are synthesized by employing a MnO 2 linear template method and calcination of polymer precursors. The porous N-doped HCT (NHCT) shows a specific capacitance of 412.6 F g –1 (1 A g –1 ), with 77.3% rate capability (20 A g –1 ). The fabricated asymmetric MnO 2 //NHCT supercapacitor displays the energy density of 55.8 Wh kg –1 at a power density of 803.9 W kg –1 . Furthermore, two typical MnO 2 //HCT and MnO 2 //NHCT devices both show the selective desalination performance of sulfate, and the MnO 2 //NHCT device possesses a high deionization value of 11.37 mg g –1 (500 mg L –1 Na 2 SO 4 ). These fabricated hollow carbon-based architectures with functional characteristics promise potential applications in energy and environmental related fields.