Khalafallah Diab, Zhi Mingjia, Hong Zhanglian
State Key Laboratory of Silicon Material, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China; Mechanical Design and Materials Department, Faculty of Energy Engineering, Aswan University, P.O. Box 81521, Aswan, Egypt.
State Key Laboratory of Silicon Material, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China.
J Colloid Interface Sci. 2022 Jan 15;606(Pt 2):1352-1363. doi: 10.1016/j.jcis.2021.08.107. Epub 2021 Aug 18.
Pseudocapacitive materials based on multi-active components are attractive platforms for future portable energy devices due to their excellent redox processes and low cost. In this study, nanostructured bismuth-iron chalcogenide anchored on multiwalled carbon nanotube framework (Bi-Fe chalcogenide/C)-based electrode materials were fabricated via a simple solvothermal protocol with enhanced electrochemical performances. The obtained Bi-Fe chalcogenide/C nanocomposites combining the improved electroconductivity of carbonic frameworks and high pseudocapacitive properties of Bi/Fe reversible redox processes were employed as negative electrodes for asymmetric supercapacitor (ASC) devices. Systematic investigation of the synthesized materials and capacitive performance indicated that the Bi-Fe-P/C electrode simultaneously achieved an intrinsically appreciable specific capacitance of 532 F g at a current density of 1 A g, high-rate capability, and cyclic stability, profiting from the structural and amorphous merits as well as the collaborative effect of multiple components. Besides, we employed an effective strategy to graft Bi-Fe-P film on a self-standing nickel phosphide (Ni-P) to manufacture a cathode with superior capacitive performances. The as-prepared core-shell Bi-Fe-P@Ni-P was used as a high-performance positive electrode and displayed a large specific capacitance of 230.6 mAh g at 1 A g. Additionally, we also assembled an ASC system using the core-shell Bi-Fe-P@Ni-P as a positive electrode and amorphous Bi-Fe-P/C as a negative electrode with an expanded operational potential of 1.6 V. The hybrid device delivered a high specific energy density of 81.5 Wh kg at a power density of 890.2 W kg together with good cyclic characteristics (85.6% capacitance retention after 8000 consecutive cycles). The obtained findings offer new insights into the design of advanced energy storage materials at relatively low costs and underscore the proficiency of heterostructured multicomponent electrodes as a practical option for enhancing the electrochemical performance of ASC.
基于多活性成分的赝电容材料因其优异的氧化还原过程和低成本，成为未来便携式能源设备颇具吸引力的平台。在本研究中，通过简单的溶剂热法制备了锚定在多壁碳纳米管框架上的纳米结构铋铁硫属化物（Bi-Fe硫属化物/C）基电极材料，其具有增强的电化学性能。所制备的Bi-Fe硫属化物/C纳米复合材料结合了碳框架改善的导电性和Bi/Fe可逆氧化还原过程的高赝电容特性，被用作不对称超级电容器（ASC）器件的负极。对合成材料和电容性能的系统研究表明，Bi-Fe-P/C电极在1 A g的电流密度下同时实现了532 F g的固有可观比电容、高倍率性能和循环稳定性，这得益于其结构和非晶态优点以及多种成分的协同效应。此外，我们采用了一种有效策略，将Bi-Fe-P膜接枝到自支撑磷化镍（Ni-P）上，以制造具有优异电容性能的阴极。所制备的核壳结构Bi-Fe-P@Ni-P用作高性能正极，在1 A g时显示出230.6 mAh g的大比电容。此外，我们还组装了一个ASC系统，使用核壳结构Bi-Fe-P@Ni-P作为正极，非晶态Bi-Fe-P/C作为负极，其工作电位扩展至1.6 V。该混合器件在890.2 W kg的功率密度下提供了81.5 Wh kg的高比能量密度以及良好的循环特性（连续8000次循环后电容保持率为85.6%）。这些研究结果为以相对低成本设计先进储能材料提供了新的见解，并强调了异质结构多组分电极作为提高ASC电化学性能的实用选择的优势。
