Synthesis of sandwich-like graphene@mesoporous nitrogen-doped carbon nanosheets for application in high-performance supercapacitors. (14th October 2019)

• Record Type: Journal Article
• Authors: Chen, Yan; Liu, Yupu; Dong, Yongli; Xia, Yuan; Hung, Chin-Te; Liu, Liangliang; Bi, Wei; Li, Wei
• Is Part Of: Nanotechnology. Volume 31:Number 2(2020)
• Publication Date: 2019-10-14
• Subjects: mesoporous materials -- coating -- nanosheets -- graphene -- supercapacitor; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab4779
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Nanostructured mesoporous carbon materials have been an attractive material for electrochemical energy storage in the recent decades. However, the controllable synthesis of two-dimensional mesoporous carbon with tunable thickness and desired pore structure is highly challenging. Here, a series of graphene@mesoporous nitrogen-doped carbon (denoted as G@mesoNC) core–shell structured nanosheets with tunable thicknesses have been fabricated via a sample hydrothermal method by using cellulose as the green and cheap carbon precursor. The resultant G@mesoNC nanosheets exhibit a distinct sandwich-like structure with tunable thicknesses (from 10 to 30 nm), a large surface area (562 m 2 g −1 ), a narrow pore size distribution (2.3 nm) and a high nitrogen content (7.95%). Significantly, when being used as the electrode for supercapaciors, the resultant G@mesoNC nanosheets showcase a high specific capacitance of 264 F g −1 . Most importantly, there is no substantial capacitance decay after 2500 cycles, indicating the perfect cyclic stability of G@mesoNC nanosheets. Our method paves a new way for synthesizing carbon electrodes for energy storage.