Affiliation:
1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering Tongji University Shanghai 200092 China
2. Institute for Application of Advanced Materials Jeonju University Chonbuk 55069 Republic of Korea
3. Department of Nano and Advanced Materials Jeonju University Chonju, Chonbuk 55069 Republic of Korea
Abstract
AbstractZinc‐ion hybrid capacitors (ZICs) are of interest for their optimal balance between power and energy density. Among the cathode materials, silicon is particularly attractive due to its abundance and potential compatibility with the microelectronics industry. However, silicon‐based materials exhibit specific capacitances far below 100 mF cm−2 because of their inherently low electronic and ionic transport, making them less competitive than other nanomaterials such as carbon and MXenes. In this study, state‐of‐the‐art silicon‐based ZICs using Mg‐doped porous silicon (PSi) derived from silica aerogels are constructed. The improved electronic conductivity achieved by Mg doping, combined with enhanced ion diffusion promoted by the porous structure, results in excellent electrochemical properties of the ZIC. Consequently, the prepared ZIC exhibits a specific capacitance of 106.1 mF cm−2 at 0.2 mA cm−2 with remarkable cyclic stability (92% retention after 20 000 cycles). Additionally, the pouch ZICs using gel electrolytes demonstrate good rate capability and a long lifespan, indicating significant potential for practical applications. These results underscore the potential of heteroatom‐doped PSi as a cathode for ZICs.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials