Co3O4 and Co(OH)2 loaded graphene on Ni foam for high-performance supercapacitor electrode
Electrode materials with high conductivity and excellent redox characteristics are vital to supercapacitors in electrochemical energy storage. Herein, a graphene/Co3O4/Co(OH)2/Ni electrode synthesized hydrothermally has high specific capacitance and the morphology and structure of the graphene/Co3O4/Co(OH)2/Ni electrodes are characterized systematically. The three electrode charge–discharge test exhibits an excellent specific capacitance of 3216 F g−1 at 5 A g−1. The two electrode charge–discharge capacitance decreases from an initial value of 195 to 140 F g−1 after 5000 cycles showing capacitance retention of 71.1%. A test device is fabricated with (OH)2/Co3O4/graphene/Ni as the positive electrode and carbon/nickel foam as the negative electrode. After charging for 15 s, two such devices in series can efficiently power five 5-mm-diameter light-emitting diodes (LEDs) and the excellent electrochemical performance reveals large potential in next-generation high-performance supercapacitors.
KeywordsElectrochemical supercapacitor Nickel hydroxide Co3O4 Co(OH)2 Graphene
This work was jointly supported by the Higher School Science and Technology Achievements Industrialization Pre-Research and Development Foundation of Heilongjiang Province (grant no. 1254CGZH04), University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province (grant no. UNPYSCT-2016087), Scientific Research Foundation for the Returned Overseas Chinese Scholars in Heilongjiang Province, Graduate Innovation Project of Qiqihar University (grant no. YJSCX2018-ZD15), Project of Plant Food Processing Technology–Heilongjiang Province superiority and characteristic discipline (grant no. YSTSXK201873), Fundamental Research Funds in Heilongjiang Provincial Universities (nos. 135109244, 135309115, 135309211), Hong Kong Research Grants Council (RGC) General Research Funds (GRF) nos. City U 11301215 and 11205617, as well as City University of Hong Kong Strategic Research Grant (SRG) no. 7005105.
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