Development of the Self-doping Porous Carbon and Its Application in Supercapacitor Electrode

Engineering raspberry-like CuCo2S4@ZnS hollow particles encapsulated with reduced graphene oxide for hybrid supercapacitors

“…(1) the wrapping of the rGO network bridges each RCCS-ZSH8 particles together to create a 3D conductive texture (Fig. 7(e)), accelerating the electron transport and thus promoting the fast electrode reactions; 36,37 (2) the rGO network effectively serves as the spacer, effectively inhibiting the aggregation of RCCS-ZSH8 particles, which is beneficial to the penetration of the KOH electrolyte within the electrode, thus increasing the ion diffusion speed within the electrode; 36,37 (3) the good conductivity of the rGO sheets created an expressway for the rapid transfer of electrons, beneficial in reducing the internal resistance and achieving a high supercapacitive performance; 70 (4) the porous/ hollow structure with a large surface area is beneficial for increasing the number of electroactive sites and shortening the ion/electron transport paths; 84 (5) the synergistic effect between rGO, CCS-HS and ZnS is advantageous for the enhancement of conductivity and electrochemical active sites, thus achieving high capacity and rate capability; 70,83,84 (6) the introduction of ZnS into CCS-HS could result in increased conductivity and creation of the new active sites, allowing for richer Faradaic redox reactions and resulting in a high capacity; 83,84 and (7) the S atom that is introduced into rCCS-ZSH8-rGO2 plays a vital role in the electrochemical reaction in boosting the conductivity and electrochemical stability of the material. 85 The CV and GCD tests of the AC were also carried out, as shown in Fig.…”

“…1,2 As of now, supercapacitors and batteries are extensively used to store energy. [3][4][5] In contrast to batteries, supercapacitors have great potential for various applications owing to their several advantages including longer operating time, fast charge/discharge potency, optimal power density, and environmental sustainability. [6][7][8][9][10][11][12][13][14] Despite these encouraging properties, low energy density (ED) delivered by supercapacitors is a bottleneck impeding their utilization in practical applications.…”