A Simple Glucose‐Blowing Approach to Graphene‐Like Foam/NiO Composites for Asymmetric Supercapacitors. Issue 1 (26th September 2019)

• Record Type: Journal Article
• Authors: He, Chengen; Jiang, Yulin; Zhang, Xiaofang; Cui, Xun; Yang, Yingkui
• Is Part Of: Energy technology. Volume 8:Issue 1(2020:Jan.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-26
• Subjects: asymmetric supercapacitors -- glucose-blowing -- graphene-like foams -- nickel oxides; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201900923
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : 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(NO3 )2 . Especially, Ni(NO3 )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 NH4 Cl as the blow agent in the absence of Ni(NO3 )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. Abstract : A one‐step Ni(NO3 )2 ‐assisted glucose‐blowing approach is developed to prepare graphene‐like foam/NiO composites (GLF/NiO) with a relatively low temperature (650 °C). The GLF/NiO shows an interconnected vesicular structure, which can promote electronic conduction, ion penetration, and utilization efficiency of the active material, therefore achieving high electrochemical performance as a positive electrode of asymmetric supercapacitors.