期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 628, 期 -, 页码 90-99出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.07.070
关键词
Nitrogen-doped; Porous carbon; Supercapacitor; Lignin; Self-assembly
资金
- National Key Research and Development Program of China [2018YFB1501503]
- National Natural Science Foundation of China (NSFC) [22038004, 22122804]
- Natural Science Foundation of Guangdong Province [2020B1111380002]
The study proposes a confined self-assembly template and in-situ mild activation strategy for preparing nitrogen-doped hierarchical porous carbons. The optimized samples exhibit an accordion-like framework and high nitrogen doping levels, showing good electrochemical performance in supercapacitor applications.
Nitrogen-doped porous carbons have emerged as promising electrode materials for supercapacitors. However, the precise control of carbon geometry and the effective doping method remain challenging. Herein, a confined self-assembly template and in-situ mild activation strategy is proposed to prepare cubic lignin composite precursor, followed by co-pyrolysis with melamine at a high temperature for nitrogen-doped hierarchical porous carbons (N-HPLCs). The zinc oxalate template has the coupling effect of confinement and mild activation during carbonization, which not only prevents the restacking of the carbon matrix but also generates zinc cyanamide intermediate to avoid excessive loss of nitrogen species. The optimized N-HPLCs exhibit an accordion-like framework with interconnected porous sheets, ultrahigh edge-nitrogen doping level (up to 12.20 at.%), and a total nitrogen doping level of 14.09 at.%. Consequently, it shows a high gravimetric capacitance of 354 F/g at 0.2 A/g, an extraordinary surface-area-normalized capacitance of 82.1 +/- 0.2 mu F/cm(2), and good rate capability in supercapacitor applications. Moreover, the fabricated coin-type symmetric supercapacitor displays a high energy density of 12.9 Wh/kg at 161.9 W/kg and superior cycling stability with a 99.5% capacitance retention after 16,000 cycles at 2.0 A/g. This work offers a novel method for preparing nitrogen-enriched lignin-derived carbon for high-performance supercapacitors. (C) 2022 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据