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A Simple Glucose‐Blowing Approach to Graphene‐Like Foam/NiO Composites for Asymmetric Supercapacitors
Author(s) -
He Chengen,
Jiang Yulin,
Zhang Xiaofang,
Cui Xun,
Yang Yingkui
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900923
Subject(s) - supercapacitor , materials science , non blocking i/o , carbonization , capacitance , graphene , composite number , electrode , chemical engineering , oxide , electrochemistry , carbon fibers , composite material , nanotechnology , metallurgy , catalysis , scanning electron microscope , organic chemistry , chemistry , engineering
The glucose‐blowing approach is facile and efficient in producing graphene‐like materials with large specific surface area, good conductivity, and yet low cost. Herein, a graphene‐like foam/NiO (GLF/NiO) composite is synthesized by a one‐step glucose‐blowing method at a relatively low carbonization temperature of 650 °C with the assistance of Ni(NO 3 ) 2 . Especially, Ni(NO 3 ) 2 is used as a blowing agent of glucose and also a precursor of NiO. The resulting GLF/NiO composite exhibits an interconnected foam‐like structure with a large specific surface area (323 m 2 g −1 ). The as‐fabricated supercapacitor electrode delivers a specific capacitance as high as 539 F g −1 at 1 A g −1 , which is much higher than that of neat GLF (147 F g −1 ) using NH 4 Cl as the blow agent in the absence of Ni(NO 3 ) 2 . The asymmetric supercapacitor is further assembled using GLF/NiO as the positive electrode and GLF as the negative electrode, respectively. The cell shows a high specific capacitance up to 152 F g −1 and an energy density of 47.6 W h kg −1 at the power density of 750 W kg −1 . Herein, an appealing approach to the facile fabrication of carbon‐based oxide nanocomposites for high‐performance electrochemical energy storage is proposed.