Preparation of supercapacitors based on nanocomposites films of MnO2/CB/C from sodium alginate and MnO2 nanoparticles by direct electrophoretic deposition and carbonization

摘要: Supercapacitors based on MnO2/CB/C nanocomposites films are prepared by direct electrophoretic deposition (EPD) process nickel plates in an aqueous solution containing of MnO2 nanoparticles, carbon black (CB) and sodium alginate (SA), followed carbonization SA to layer. The from different electrolytic solutions with mass ratios CB 8: 1: 1 6: 2: 2. Same traditional Doctoral Blade (DB) for morphologies performances comparisons, which mixtures polyvinylidene fluoride (PVDF) used. From scanning electron microscopy (SEM) high resolution transmission (HRTEM) images, the shows a uniform aggregation nanoparticles covered layers. In case MnO2/CB/PVDF DB process, separately clustered, clusters adhered together PVDF. More film better contact layer can be obtained EPD/Carbonization process. electrochemical compared areal specific capacitances (C-a), charge transfer resistance retention capacitance after 1500 cycles charge/discharge test stability respectively. show smaller resistances at each ratio. coating surface effectively delay loss, leads 98% cycles, much than those (50%). is easy way make pseudo capacitive materials alginates, improve supercapacitors. (C) 2015 Elsevier Ltd. All rights reserved.