(357e) Fabrication and Testing of Asymmetric Supercapacitors Fabricated with (Mn,Ti)-Oxides and Chtl Derived Hydrochar/Graphene

Asymmetric supercapacitors generally possess higher energy density as well as power density. Supercapacitors of this kind utilize dissimilar electrodes. As graphene is very expensive electrode material, we derived hydrochar electrode from the catalytic hydrothermal liquefaction (CHTL) processing of biomass waste residue such as corn stover. Hydrochar was used as a opposite electrode with recently reported (Mn, Ti)-mixed perovskite oxide electrode and specific capacitance was tested. To prepare hydrochar with superior charge storage capability, the CHTL derived char was thermally/chemically post-treated and used as electrode material for asymmetric supercapacitors. . As-fabricated asymmetric supercapacitors were charged with 2.0 V and 0.01 A for 10 minutes and their several charging-discharging cycles were analyzed by cyclic voltammetry to determine specific capacitance as well as the peaks corresponding to oxidation and reduction potentials. Voltammograms of the asymmetric supercapacitors obtained with hydrochar with (Mn,Ti)-oxide opposite electrodes were compared with graphene/(Mn,Ti)-oxide electrodes. Results obtained with specific capacitance will be presented.