Graphene Hydrogel Film Adsorbed with Redox-Active Molecule Toward Energy Storage Device with Improved Energy Density and Unfading Superior Rate Capability

Abstract

Energy storage device (ESD) with enhanced energy density is desired in this electronics era, but it is often achieved at the compensation of the reduction of rate capability. To address this challenge, a hierarchical graphene hydrogel film (GHF) adsorbed with redox-active diaminoanthraquinone (DAA) molecule (DAA-GHF) was designed. The resulting DAA-GHF shows a large specific surface area and hierarchical porous structure, which can offer extra multiple charge storage and simultaneously guarantee rapid electron and ion transportation. Using the synergistic effect of DAA and GHF, DAA-GHF shows a significantly enhanced capacitance of 394.3 F g −1 at 1 A g −1 in supercapacitors and 172.3 mAh g −1 at 0.2 A g −1 in Zn ion batteries (ZIBs). Moreover, the rate capability for DAA-GHF-based supercapacitor and ZIB maintains outstanding, remaining 69.3% for supercapacitor and 52.5% for ZIB when the current density increased to 100 and 30 A g −1 , respectively. Accordingly, ZIB achieves an ultrahigh power density of 28.1 kW kg −1 and presents excellent capacity retention of 92.5% after 5000 cycles. Besides, the flexible solid-state ZIB shows stable capacity under various bending states or after 500 times bending. This strategy provides a new path for fabricating highperformance films for future flexible electronic products.

Direct Ink Printing for Flexible Zinc‐Ion‐Hybrid Micro‐Supercapacitors Based on Hierarchical Porous Carbon as Cathode

“…With the increase of the scan rate, the contribution of the capacitive‐controlled gradually increased, in which the calculated contribution was 29 % at the scan rate of 2 mV s −1 and 52 % at the scan rate of 10 mV s −1 . [52.54] The incremental capacitive contribution indicated the rapid electrochemical kinetics which was beneficial to the rate capability of the as‐fabricated device [38] …”

Redox-active sodium 3,4-dihydroxy anthraquinone-2-sulfonate anchored on reduced graphene oxide for high-performance Zn-ion hybrid capacitors

“…The expansion structure is mainly due to the microscopic forces between the graphene sheets. 20,27 To further explore the morphology of the samples, TEM images of the samples are provided. As shown in Fig.…”

“…19 For example, in ZIHCs, the carbonyl of ARS can adsorb and desorb Zn 2+ during the process of charge and discharge reversibly, which can provide additional pseudo-capacitance for ESDs. 5,20 Additionally, the molecular structure and functional groups can be adjusted to optimize the electrochemical performance. Various quinones and their derivatives have been reported, including anthraquinone, 17,20 phenanthrenequinones, 21 hydroquinone, 22 benzoquinone, 23 etc.…”

“…5,20 Additionally, the molecular structure and functional groups can be adjusted to optimize the electrochemical performance. Various quinones and their derivatives have been reported, including anthraquinone, 17,20 phenanthrenequinones, 21 hydroquinone, 22 benzoquinone, 23 etc. Although some progress has been made, there are still some limitations in the practical application of quinone molecules in ESDs.…”

Redox molecule Alizarin red S anchored on biomass-derived porous carbon for enhanced supercapacitive performance

“…One of the common ways to incorporate redox-active molecules into porous systems is through electrostatic attraction, hydrogen bonding, p-p stacking between redox-active molecules and porous systems. [20][21][22][23] Zhou 24 et al confined methylene blue (MB) in the interlayer of reduced graphene oxide by magnetic stirring and hydrothermal reaction, the strong interaction between MB molecules and rGO enables the composites to exhibit excellent rate capability and cycling stability. Wang 14 et al used sodium lignosulfonate as a precursor and K 2 FeO 4 as an activator to produce biomass hierarchical porous carbon, and a high-performance electrode material was prepared by homogenizing porous carbon with ARS.…”