Free-radical-initiated strategy aiming for pitch-based dual-doped carbon nanosheets engaged into high-energy asymmetric supercapacitors

超级电容器 材料科学 碳化 化学工程 纳米技术 碳纤维 功率密度 氢氧化钾 复合材料 复合数 电容 功率(物理) 扫描电子显微镜 电极 工程类 量子力学 物理 化学 物理化学
作者
Guoli Zhang,Taotao Guan,Jinli Qiao,Jianlong Wang,Kaixi Li
出处
期刊:Energy Storage Materials [Elsevier BV]
卷期号:26: 119-128 被引量:104
标识
DOI:10.1016/j.ensm.2019.12.038
摘要

Abstract Doped quasi-two-dimensional carbons with layer-stacked porous architecture and chemically functionalized surface are strongly appealing for high-energy supercapacitors, but there are daunting challenges to synthesize them through a cost-efficient and eco-friendly path. Herein, N/S dual-doped stacked carbon nanosheets (D-SCN) is first synthesized from coal tar pitch, a cheap coking by-product, beginning with a controlled molecular radical-polymerization initiated by 2,3-dimethyl-2,3-diphenylbutane, followed by a one-step carbonization-activation process in presence of potassium benzoate and N,N′-diphenylthiourea. As-obtained D-SCN with reasonable densification shares a well-designed layer-stacked topology texture, hierarchical interconnected porous structure and N/S dual-doped surface, which work together to harvest high supercapacitive performance. The D-SCN delivers a maximal specific capacitance of 458 ​F ​g−1, which is considerably higher than most of previously reported for other carbon materials. As-assembled asymmetric all-solid-state supercapacitor with a wide voltage range of 0–1.8 ​V takes on a volumetric energy density of 27 ​W ​h ​L−1 at a power density of 296 ​W ​L−1 with fading capacitance of merely 5.9% after 20000 cycles. The route advocated here for preparing pitch-based nanocarbons opens up new horizons in exploring large-scale preparation of electrode materials suitable for narrow spaces.
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