High Volumetric Capacitance, Ultralong Life Supercapacitors Enabled by Waxberry‐Derived Hierarchical Porous Carbon Materials

Abstract

Supercapacitors with fast charge/discharge rate and long cycling stability (>50 000 cycles) are attractive for energy storage and mobile power supply. In this paper, a facile strategy is developed to fabricate an Fe2O3/FeS‐decorated N, S‐codoped hierarchical porous carbon hybrid. Its microstructure and compositions can be readily controlled through adjusting the hydrothermal reaction between waxberry and iron sulfate. The constructed supercapacitors with the as‐prepared carbon materials from this reaction are able to exhibit outstanding capacitive performance with a superfast charge/discharge rate (<1 s), ultralong cycle life (>50 000 cycles, 80 A g−1), ultrahigh volumetric capacitance (1320.4 F cm−3, 0.1 A g−1), and high energy density (100.9 W h kg−1, 221.9 W h L−1). The outstanding performance makes it one of the best biomass‐derived supercapacitors. The superior capacitive behavior is likely to arise from the N and S codoping on the surface/edge/skeleton of the carbon microspheres and nanosheet composites coupled with the fast redox reaction of Fe2O3/FeS. Overall, this research presents a new avenue for developing the next generation of sustainable high‐performance energy storage device.

Three‐Dimensional N‐doped Porous Carbon Derived from Monosodium Glutamate for Capacitive Deionization and the Oxygen Reduction Reaction

“…The Ragone plots in accordance of the power density and energy density can also evaluate the performance of the 3D‐NPC and NC for capacitive device. The 3D‐NPC electrode kept higher energy density than that of NC and it delivered 10.78 Wh kg −1 even the power density increased to 0.5 A g −1 (see the Supporting Information, Figure S6) . Highlighted cycle stability is another evaluation criterion during the practical application for supercapacitor.…”

Recent Progress in Biomass‐Derived Electrode Materials for High Volumetric Performance Supercapacitors

“…However, there are only few studies [94,104,105] focused on the incorporation of pseudocapacitive transition metal materials. However, there are only few studies [94,104,105] focused on the incorporation of pseudocapacitive transition metal materials.…”

“…[94] The morphology and pore structure could be directly controlled by adjusting the hydrothermal temperature and the addition of iron sulfate in Figure 13. Pristine and heteroatom doped biomass carbon materials are indeed limited by their packing density when they possess a high specific surface area.…”

Electrochemical Double‐Layer Capacitor Energized by Adding an Ambipolar Organic Redox Radical into the Electrolyte

“…[1] However, their energy density is still much lower than rechargeable batteries. [3][4][5][6][7][8][9][10][11][12] One typical approach is to increase the efficient surface area of carbon materials for ions adsorption, [13][14][15][16][17][18] but which generally results in the reduction of tap density of electrodes.A nother is to modify the carbon materials with pseudo-capacitive materials (such as metal oxides and conductive polymers) to combine the adsorption capacitance and pseudo-capacitance, [19][20][21][22] but with the sacrifice of conductivity and stability of electrodes. [3][4][5][6][7][8][9][10][11][12] One typical approach is to increase the efficient surface area of carbon materials for ions adsorption, [13][14][15][16][17][18] but which generally results in the reduction of tap density of electrodes.A nother is to modify the carbon materials with pseudo-capacitive materials (such as metal oxides and conductive polymers) to combine the adsorption capacitance and pseudo-capacitance, [19][20][21][22] but with the sacrifice of conductivity and stability of electrodes.…”

“…[2] Accordingly, many efforts have been devoted to improve the energy density of EDLCs via advanced design of electrode materials. [3][4][5][6][7][8][9][10][11][12] One typical approach is to increase the efficient surface area of carbon materials for ions adsorption, [13][14][15][16][17][18] but which generally results in the reduction of tap density of electrodes.A nother is to modify the carbon materials with pseudo-capacitive materials (such as metal oxides and conductive polymers) to combine the adsorption capacitance and pseudo-capacitance, [19][20][21][22] but with the sacrifice of conductivity and stability of electrodes.…”