One‐Step Synthesis of Co3O4/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor. Issue 8 (28th February 2017)

• Record Type: Journal Article
• Authors: Yan, Huijun; Bai, Jianwei; Liao, Mingrui; He, Yang; Liu, Qi; Liu, Jingyuan; Zhang, Hongsen; Li, Zhanshuang; Wang, Jun
• Is Part Of: European journal of inorganic chemistry. Issue 8(2017)
• Page Start: 1143
• Page End: 1152
• Publication Date: 2017-02-28
• Subjects: Self‐assembly -- Gels -- Graphene -- Nanotechnology -- Asymmetric supercapacitors; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201601202
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : A facile one‐step hydrothermal strategy has been developed to prepare 3D porous Co3 O4 /graphene aerogel (Co3 O4 /GA). Due to the combination of a highly interconnected 3D network of GA and porous Co3 O4 nanospheres, the resulting Co3 O4 /GA electrode exhibits exceptional electrical conductivity and pseudocapacitance, making it an excellent material for energy‐storage devices. The Co3 O4 /GA composites possess a high specific surface area of 127 m 2 g –1 and a broad pore‐size distribution of 1–110 nm. The presence of porous Co3 O4 is found to be remarkably effective in enhancing the specific capacitance of the composite aerogel, up to 1512.7 F g –1 at 1 A g –1 . Furthermore, the combination of the two aerogel electrodes with a LiOH/PVA‐gel electrolyte endows our all‐solid‐state asymmetric supercapacitor (SASC) of Co3 O4 /GA//GA with a stable cycling performance in the high‐voltage region of 0–1.6 V (capacitance retention of 81.5 % after 5000 continuous charge/discharge cycles), and superior electrochemical performance, with an energy density of 68.1 W h kg –1 at a power density of 982.9 W kg –1, which is even higher than the maximum energy density of 58.7 W h kg –1 at a power density of 1209.4 W kg –1 of this ASC in a liquid‐state electrolyte. These results indicate that Co3 O4 /GA could be a potential candidate in the field of supercapacitors. Abstract : A facile one‐step hydrothermal strategy has been used to prepare a 3D porous Co3 O4 /graphene aerogel (Co3 O4 /GA), which consists of a highly interconnected 3D network of GA and porous Co3 O4 nanospheres. Both the all‐solid‐state and liquid‐state supercapacitors of Co3 O4 /GA//GA show high power density and cycling stability.