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- Title
Two-Step Preparation of Hierarchical Porous Carbon Materials Derived from Tannin for Use as an Electrode Material for Supercapacitors.
- Authors
Jianping Deng; Qianqian Zhang; Yuling Lan; Lingcong Luo; Zimin Dai; Zhonghang Lin; Zhixin Lu; Jiancheng Yuan; Yiqi Fu; Lu Luo; Weigang Zhao
- Abstract
The development and utilization of biomass and agroforestry processing byproducts for high-value applications have been an important topic in the field of renewable materials research. Based on this, a two-step microwave hydrothermal pre-carbonization and KOH activation method was proposed to synthesize tannin-based activated carbons with a high specific surface area, hierarchical pore structure, and good electrochemical performance. The microstructure, texture properties, and physicochemical characteristics were investigated. The results show that the prepared tannin-based activated carbons presented a hierarchical pore structure (micro- and mesopores) with a specific surface area as high as 997.46 m³ g-1. The electrochemical analysis shows that the tannin-based activated carbons have good wettability and charge transfer rates. Under the three-electrode system with 6 M KOH as the electrolyte, the active material TAC600-4 had a maximum specific capacitance of 171 F g-1 at 0.5 A g-1. As the current density increases to 10 A g-1, the specific capacitance can still be maintained at 149 F g-1, indicating a good rate capability. Therefore, the specific surface area and pore size of tannin-based activated carbons can be effectively adjusted by the alkali/carbon ratio, making it a promising supercapacitor electrode material and providing a new method for the high-value development of tannins in the field of electrochemical energy storage.
- Subjects
SUPERCAPACITORS; BIOMASS; MICROSTRUCTURE; ENERGY storage; ACTIVATED carbon
- Publication
Journal of Renewable Materials, 2023, Vol 11, Issue 6, p2631
- ISSN
2164-6325
- Publication type
Article
- DOI
10.32604/jrm.2023.027163