Achieving High Voltage and Excellent Rate Capability Supercapacitor Electrodes Derived From Bio‐renewable and Sustainable Resource

Abstract

The design and development of bio‐renewable and sustainable carbon‐carbon based supercapacitor electrodes provide high volumetric energy density and high durability even at higher potential window are one of the major technological challenges. The present study demonstrates the conversion of wheat flour as bio‐renewable and sustainable resource into hierarchical high surface area bi‐model porous carbon nanosheets (1620 m2 g−1) as high performance supercapacitor electrode. Bi‐model porous carbon can provide the high electrochemical performance because it has optimum textural characteristic. The benefit from simultaneous achievement of extended voltage window of 3.2 V and high volumetric capacitance of 86 F cm−3 with high electrode density of 0.76 g cm−3, the supercapacitor cell can provide higher volumetric energy density of 30.46 Wh L−1. Particularly, supercapacitor cell shows exceptional rate capability at commercial level active mass loading (10 mg cm−2) and high durability at 3.2 V upon 15,000 charge‐discharge cycles with 95 % of capacitance retention. The integrated power electronic booster and the concept of recovery of the stored energy from the supercapacitor are explained by a simulation as well as experimental study for the first time. This work inspires new insights to develop a sustainable high volumetric supercapacitor for portable and wearable device applications.

Novel Insight into the Concept of Favorable Combination of Electrodes in High Voltage Supercapacitors: Toward Ultrahigh Volumetric Energy Density and Outstanding Rate Capability

“…It is challenging to achieve 3.4 V in organic electrolytes. Recently the operating voltage of the commercial Maxwell SC was enlarged to 3.0 from 2.85 V. The main advantage of increasing the operating potential is to enhance the SC cell energy density, for example, 3400 F cell with 2.85 V has an energy density of around 7.4 Wh kg –1 and now the same configured cell with the increased voltage of 3.0 V is having the energy density of 8.57 Wh kg –1 with same cell configuration, [ 22 ] respectively. However, in the present study, the smart combination of the two dissimilar composite carbon electrodes ACF and AWF can increase the cell voltage and high volumetric capacitance which can reduce the overall size of the SC device.…”

A Low‐Temperature Dehydration Carbon‐Fixation Strategy for Lignocellulose‐Based Hierarchical Porous Carbon for Supercapacitors

“…The volumetric specific capacitance of RHPC‐N10 electrode (134.4 F cm −3 ) is 36.6 % higher than that of RHPC electrode (98.4 F cm −3 ), as shown in Figure 6f. Compared with other carbon materials with excellent capacitance performance such as activated carbon, [66] poly(benzoxazine‐co‐resol)‐based hierarchically porous carbon, [67] silk‐based carbon nanosheet, [68] and graphene/carbon nanotube composite, [69] RHPC‐N electrode also has a relatively higher gravimetric and volumetric capacitances. Because of higher specific capacitance and tap density of RHPC‐N10, the energy density of RHPC‐N10 supercapacitor is also significantly higher than that of RHPC supercapacitor, especially the volumetric energy densities.…”

Three‐Dimensional Porous Carbon Materials from Coix lacryma‐jobi L. Shells for High‐Performance Supercapacitor

“…[1] Among existing energy storage technologies, supercapacitor has various advantages, such as simple manufacturing process, high power density, fast charge, long lifetime and reliable security, so supercapacitor has potential application value in the portable energy storages. [2] Supercapacitor can be classified as electrical double-layer capacitor (EDLC) and faraday pseudo-capacitor. EDLC stores electricity by accumulating static charge on the surface of active material.…”