Natural Biomass Hydrogel Based on Cotton Fibers/PVA for Acid Supercapacitors

Abstract

A gel polymer electrolyte (GPE) is prepared for enhancing electrochemical performances of supercapacitors (SCs), using a cotton and PVA composite membrane as the polymer matrix and 1 M H2SO4 solution as the electrolyte. The synthesized cotton/poly­(vinyl alcohol) (PVA)-based membrane with a weight ratio of 8:5 (C 5) shows a high tensile strength of 3.55 MPa and an electrolyte uptake of 901.45 wt %, and the SC based on the corresponding membrane (G 5) delivers the best specific capacitance: it attains 106 F g–1 at 1.0 A g–1 and maintains 106% of the initial capacitance after 10 000 cycles. In addition, three planar SCs in series assembled with G 5 exhibit superb electrochemical performances and flexibility as G 5 can be bent to 180° without damage, maintaining superior electrochemical performance. Therefore, G 5 is a possible candidate for flexible SCs with outstanding performance.

Flexible Supercapacitor with a Pure DNA Gel Electrolyte

“…Among various polymer electrolytes, PVA has been widely used as an essential candidate material for the preparation of gel electrolyte due to its high mechanical properties, water solubility, and easy film‐forming ability with simple preparation techniques. [ 45,52 ] Figure 5b–d display the CV, GCD, and EIS analyses of liquid LiCl, DNA gel, and PVA gel electrolyte‐based SCs, respectively. The higher capacitance and better EDLC behavior of DNA gel electrolyte were apparent as compared to those of liquid LiCl and PVA gel electrolytes.…”

“…Among various polymer electrolytes, PVA has been widely used as an essential candidate material for the preparation of gel electrolyte due to its high mechanical properties, water solubility, and easy film-forming ability with simple preparation techniques. [45,52] were apparent as compared to those of liquid LiCl and PVA gel electrolytes. Due to its compact arrangement of molecular chains, PVA offers a low concentration of charge carriers.…”

Perspective on Biomass-Based Cotton-Derived Nanocarbon for Multifunctional Energy Storage and Harvesting Applications

“…87 Cotton was also explored as a gel polymer electrolyte and as a separator to check the electrochemical performance of the supercapacitor device. 88 The cotton-derived electrode was also used as a battery and capacitor-type MXene anode and MnO 2 cathode, respectively, which gives high metallic conductivity and redox behavior of energy storage and has shown 93% retention up to 16 000 cycles. 89 The cotton-derived electrode nanomaterial has been summarized in Table 1, and specific capacitances have been compared.…”

Multifunctional Antifreezing Organogel Polyelectrolyte for a Flexible Supercapacitor

“…With the continuous progress and development of wearable electronic technology, flexible electronic products with the characteristics of portability, wearability, collapsibility, miniature, and lightweight have been paid more and more attention. − As we know, in lots of energy storing devices, flexible solid-state supercapacitors have become one of the most hopeful flexible energy storage devices due to their large specific capacitance, rapid charging and discharging properties, wonderful stability, and excellent mechanical properties. − The rational design of electrode or electrolyte materials − and the optimization of device configuration have become the direction of development to build high-performance flexible supercapacitors (FSCs). Conductive gels with intrinsic flexibility, significant mechanical recycling, and remarkable ionic conductivity can not only be used as ideal materials for FSC electrolytes − but also have considerable applications in tissue engineering, drug delivery, water treatment, bioengineering, and many other fields.…”