Abstract
Block carbon is convenient for energy applications, however constructing composites for electronic energy storage by loading metal oxides on the surface of wood derived carbon is fraught with complications. The mild TEMPO method was employed to treat wood to expand carboxyl groups, followed by introducing tannic acid (TA) to produce Ru-TA complex (underdeveloped provider of RuO2) on wood. These composites were impregnated with H2SO4 and carbonized, transitioning into block electrodes with a clear-stable carbon skeleton and comprising uniformly diffused RuO2. The block electrodes exhibit an impressive specific surface area, with TPWTSC-7 among them completing 812.1406 m2/g. Electrochemical characteristics were investigated using KOH and H2SO4 solutions in three-electrode. Evaluation indicates that RuO2 and electrolyte have a comprehensive effect on performance, with a representative TPWTSC-4 demonstrating the Ct of 189.09 F/g (0.1 A g-1) in KOH solution, while achieving 289.99 F/g (0.1 A g-1) in H2SO4 solution, which is 8.82 times that of TPWSC. The storage mechanism of TPWTSC-0.83, TPWTSC-4 and TPWTSC-7 in H2SO4 solution are affected by diffusion control and capacitance, and TPWTSC-4 emerges a pseudo-capacitive contribution of 63.82 % (5 mV/s). For two-electrode, the easily operable TPWTSC-4//TPWTSC-4 achieves a CT of 34.17 F/g (0.05 A g-1), which also exhibits impressive power density.
Published Version
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