High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

• Published in: ChemSusChem Vol. 12; no. 18; pp. 4249 - 4256
• Main Authors: Wang, Xuejie, Song, Xinyu, Li, Shengping, Yu, Zhiqing, Zhao, Lu, Xiao, Zhihua, Zhang, Mengxuan, Xu, Chenggen, Qi, Chuanlei, Ma, Xinlong, Gao, Jinsen
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 20-09-2019
• Subjects: Activated carbon; Basic magnesium carbonate; capacitance; Chemical vapor deposition; Crystallization; Electrical resistivity; Electrochemical analysis; Electrodes; Energy storage; Fluidized bed reactors; Fluidized beds; Graphene; Gravimetry; Lamella; Microspheres; Organic chemistry; Structural integrity; Supercapacitors; electrodes; capacitance; supercapacitors; chemical vapor deposition; graphene
• ISSN: 1864-5631; 1864-564X
• DOI: 10.1002/cssc.201901519

Nest‐like porous graphene microspheres (NPGMs) are grown by using a chemical vapor deposition (CVD) method in a fluidized bed reactor from methane and basic magnesium carbonate microspheres (synthesized by a stirring‐induced crystallization approach) as carbon source and template, respectively. The CVD‐derived NPGMs have a few‐layer structure and high electrical conductivity, as well as a three‐dimensional individual macroarchitecture accompanied with well‐developed pore channels and great structural integrity. As the electrode for a symmetric supercapacitor, the effect of different mass loadings for NPGMs‐based electrodes on the capacitive energy‐storage performance is investigated. Superior electrochemical properties with respect to gravimetric, areal, and total capacitances, rate capability, and durability are shown by the NPGMs‐based symmetric supercapacitors, even at mass loadings up to 10 mg cm−2. Moreover, the electrochemical behavior of the NPGMs‐based electrode is much superior to those of two‐dimensional lamella‐like graphene and commercial activated carbon.
Get loaded: Nest‐like porous graphene microspheres (NGPMs) are grown by a chemical vapor deposition method in a fluidized bed reactor from methane and basic magnesium carbonate microspheres as carbon source and template, respectively. As the electrode for a symmetric supercapacitor, NPGMs‐based electrodes show superior electrochemical properties with respect to capacitance, rate capability, and durability, even at mass loadings up to 10 mg cm−2.