Preparation and Electrochemical Performance of Thick-layer 3D Porous Graphitized Activated Wood Carbon Electrode

By a simple vacuum-assisted catalytic method, the 3 D porous thick wood-carbon electrode with large aspect ratio is simultaneously graphitized and activated for the first time. Meanwhile, it is also the first time that pipe wall of the thick wood-derived carbon has been successfully punched. The pore structure, specific surface area and graphitization degree of wood-carbon electrode are significantly improved, therefore, the material become a thick electric double layer capacitor material with excellent electrochemical performance. According to SEM, TEM, and Raman tests, the catalyst solution uniformly adhere to the inner wall of the pores of the substrate, effectively decreasing the influence of the internal pipeline pressure in the wood pipeline on the pretreatment of the substrate and activation graphitization. Combined with electrochemical tests, it is known that the electrochemical performance and graphitization degree of AGWC is better than that of CAWC(CO₂ activated electrode) and WC(initial carbon electrode). The ID/IG ratios of samples are 0.9(AGWC), 1.05(CAWC) and 1.17(WC). When current density increases from 0.5 A/g to 5 A/g, the rate performance of the AGWC is 1.5 times and 2 times higher than those of the CAWC and WC. The results show that the method can achieve the cooperative graphitization and activation of the thick layer 3 D porous structured electrode materials of large aspect ratio in one step. The technology has certain universality, and it also provides technical support for the preparation of thick-layer graphitized activated carbon electrode.