3D Graphene Frameworks/Co₃O₄ Composites Electrode for High-Performance Supercapacitor and Enzymeless Glucose Detection

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• 作者：Lin Bao ; Tao Li ; Shu Chen ; Chang Peng ; Ling Li ; Qian Xu ; Yashao Chen ; Encai Ou and Weijian Xu
• 刊名：Small
• 出版年：2017
• 出版时间：February 3, 2017
• 年：2017
• 卷：13
• 期：5
• 全文大小：2963K
• ISSN：1613-6829

文摘

3D graphene frameworks/Co₃O₄ composites are produced by the thermal explosion method, in which the generation of Co₃O₄ nanoparticles, reduction of graphene oxide, and creation of 3D frameworks are simultaneously completed. The process prevents the agglomeration of Co₃O₄ particles effectively, resulting in monodispersed Co₃O₄ nanoparticles scattered on the 3D graphene frameworks evenly. The prepared 3D graphene frameworks/Co₃O₄ composites used as electrodes for supercapacitor display a definite improvement on electrochemical performance with high specific capacitance (≈1765 F g⁻¹ at a current density of 1 A g⁻¹), good rate performance (≈1266 F g⁻¹ at a current density of 20 A g⁻¹), and excellent stability (≈93% maintenance of specific capacitance at a constant current density of 10 A g⁻¹ after 5000 cycles). In addition, the composites are also employed as nonenzymatic sensors for the electrochemical detection of glucose, which exhibit high sensitivity (122.16 µA mM ⁻¹ cm⁻²) and noteworthy lower detection limit (157 × 10⁻⁹ M, S/N = 3). Therefore, the authors expect that the 3D graphene frameworks/Co₃O₄ composites described here would possess potential applications as the electrode materials in supercapacitors and nonenzymatic detection of glucose.