Chemical activation is a common process for preparing porous carbon electrode materials of supercapacitors. Nevertheless, chemical activation approach has the disadvantages of being chemically caustic, environmentally unfriendly, and expensive. This study constitutes a multi-scale self-template approach for the preparation of lignin-derived hierarchical porous carbons (LHPCs) with high specific surface areas and excellent electrochemical performances. KCl, carbonates, and sulfates, generated in the carbonization process, play the role of multi-scale template agents for the pore-forming process. LHPCs exhibited superb electrochemical performances as electrodes of supercapacitors with alkaline and neutral sulfate electrolytes. In addition, the Zn//LHPCs hybrid supercapacitors (ZIHSCs) achieved an ultra-high energy density of 135 Wh kg−1, which is 20 times higher than symmetric supercapacitors with KOH electrolytes (6.6 Wh kg−1) and 9 times higher than symmetric supercapacitors with Na2SO4 electrolyte (14.8 Wh kg−1). This work proposes a general multi-scale self-template strategy for the synthesis of hierarchical porous carbons from sodium lignosulfonate for supercapacitor applications.
|Original language||English (US)|
|Journal||Journal of Energy Storage|
|State||Published - Jun 16 2022|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-29
Acknowledgements: The authors acknowledge the financial support from the National Natural Science Foundation of China (22108044), the Research and Development Program in Key Fields of Guangdong Province (2020B1111380002), the Basic Research and Applicable Basic Research in Guangzhou City and the financial support from the Guangdong Provincial Key Laboratory of Plant Resources Biorefinery (2021GDKLPRB07).
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering