| In this paper, nickel hydroxide was prepared by adding structure-directing agents and cobalt/iron oxide was synthesized by bringing in carbon sphere with hydrothermal method. SEM and BET were used to observe the surface morphologies and analyze the pore size distribution; Besides, electrochemical methods were used to characterize the electrochemical performance of as-prepared electrode materials. Conclusions are as follows:(1) Ni(OH)2-PAM and Ni(OH)2-CTMAB were synthesized by hydrothermal process, accompanied with poly(acrylamide)(PAM) or cetyltrimethylammonium bromide(CTMAB) as structure-directing agent. SEM and BET were used to show that Ni(OH)2-PAM and Ni(OH)2-CTMAB both has a more perpect pore size distribution than Ni(OH)2, which was added none structure-directing agent; EIS test showed that the interface resistance of electrode and the electrolyte was reduced while CTMAB and PAM was added; The GCD was test in 1.0 M Na(OH)2 +0.5 M Na2SO4 solution, it was concluded that the specific capacitance of Ni(OH)2-PAM and Ni(OH)2-CTMAB is 1200 F g-1 and 757 F g-1 respectively at the discharge current density of 1 A g-1, much higher than that of Ni(OH)2(only 113 F g-1). Finally, the concentration of PAM, 3 g L-1, and the reaction temperature, 180 ℃, were confirmed to be the optimum reaction conditions to synthesize Ni(OH)2-PAM.(2) carbon sphere was used to manufacture cobalt/iron oxide. C-Co Fe2O4, 2C-Co Fe2O4 and 3C-Co Fe2O4 were obtained by 0 ℃, 200 ℃ and 300 ℃ calcination. FT-IR demonstrated that aromatization reaction of glucose had happened under the condition of hydrothermal. Surface morphologies were characterized by SEM, it was found that with the temperature increasing, the small sphere was broken to form porous structure. The phenomenon explained the capacitance improvement. CV curves were test in 1 M H2SO4 solution, and it showed that at 1 mv s-1, 3C-Co Fe2O4 has a specific capacitance of 154.2 F g-1. |
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