Extremely stretchable, sticky and conductive double-network ionic hydrogel for ultra-stretchable and compressible supercapacitors

Zhang, Haoxiang; Niu, Wenbin; Zhang, Shufen

doi:10.1016/j.cej.2020.124105

Cited by 103 publications

(44 citation statements)

References 57 publications

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“…There are many hosts for polymer which have been explored to build up polymer hydrogel electrolytes. For example, chitosan, sodium alginate, agar, cellulose, starch, poly (ethylene oxide) (PEO), poly (acrylic acid) (PAA), poly (acrylamide), poly (ether ether ketone) (PEEK), and poly (vinyl alcohol) (PVA) [ 140 , 178 , 179 , 180 , 181 , 182 , 183 , 184 , 185 , 186 ].…”

Section: Electrochemical Applications Of Polymer Hydrogelsmentioning

confidence: 99%

Fundamental Concepts of Hydrogels: Synthesis, Properties, and Their Applications

et al. 2020

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In the present review, we focused on the fundamental concepts of hydrogels—classification, the polymers involved, synthesis methods, types of hydrogels, properties, and applications of the hydrogel. Hydrogels can be synthesized from natural polymers, synthetic polymers, polymerizable synthetic monomers, and a combination of natural and synthetic polymers. Synthesis of hydrogels involves physical, chemical, and hybrid bonding. The bonding is formed via different routes, such as solution casting, solution mixing, bulk polymerization, free radical mechanism, radiation method, and interpenetrating network formation. The synthesized hydrogels have significant properties, such as mechanical strength, biocompatibility, biodegradability, swellability, and stimuli sensitivity. These properties are substantial for electrochemical and biomedical applications. Furthermore, this review emphasizes flexible and self-healable hydrogels as electrolytes for energy storage and energy conversion applications. Insufficient adhesiveness (less interfacial interaction) between electrodes and electrolytes and mechanical strength pose serious challenges, such as delamination of the supercapacitors, batteries, and solar cells. Owing to smart and aqueous hydrogels, robust mechanical strength, adhesiveness, stretchability, strain sensitivity, and self-healability are the critical factors that can identify the reliability and robustness of the energy storage and conversion devices. These devices are highly efficient and convenient for smart, light-weight, foldable electronics and modern pollution-free transportation in the current decade.

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Section: Electrochemical Applications Of Polymer Hydrogelsmentioning

confidence: 99%

Fundamental Concepts of Hydrogels: Synthesis, Properties, and Their Applications

et al. 2020

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“…Flexible and conductive materials exhibit huge potential in intelligent fields, such as soft robotics, − flexible devices, − and electronic skins. − Flexible materials with high conductivity can realize high performance and low energy consumption in wearable devices. In general, conductive fillers such as carbon-based materials, − conductive polymers, − and metallic salts − were chosen for flexible conductive devices. Compared with these materials, liquid metals have much higher conductivity, fluidity, softness, and self-healing properties, − which make them more suitable as the key component of flexible conductive devices.…”

Section: Introductionmentioning

confidence: 99%

Printable and Recyclable Conductive Ink Based on a Liquid Metal with Excellent Surface Wettability for Flexible Electronics

Guo

Ding

et al. 2021

ACS Appl. Mater. Interfaces

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Flexible electronics greatly facilitate human life due to their convenience and comfortable utilization. Liquid metals are an ideal candidate for flexible devices; however, the high surface tension and poor surface wettability restrict their application on diverse substrates. Herein, a printable and recyclable ink composed of poly(vinyl alcohol) and a liquid metal (PVA-LM) was developed to resolve these problems. The materials were designed considering the compatibility between PVA and the liquid metal, and the composite theory was applied to determine the component proportion. The developed composites improved the surface wettability of the liquid metal on diverse substrates, and three-dimensional (3D) printing technology was chosen to maximize the use of this material. Moreover, the PVA-LM ink showed excellent conductivity of about 1.3 × 105 S/m after being turned on, which favored the designing of alarm systems and object locators. The flexible sensors produced with this ink have broad application, high sensitivity, and superstable signal generation even after 200 cycles. When acting as strain sensors, the constructed composites had high sensitivity for monitoring the human movements. Furthermore, liquid metals in printed products can be recycled under alkaline conditions. This study opens a new direction for the next generation of environmentally friendly flexible devices.

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“…In recent years, with the continuous development of electronic technology and the improvement of people's living standards, a variety of health equipment such as human health monitoring, wearable sensors, break AIDS and other devices have been widely developed. [1][2][3][4] Among them, flexible sensors could convert external stimuli into electrical signals such as resistance and current, which have attracted widespread attention in wearable sensors. 5 However, electronic components in traditional electronic equipment were not reusable and biodegradable, which increased the burden on the environment.…”

Section: Introductionmentioning

confidence: 99%

A stretchable, compressible and anti‐freezing ionic gel based on a natural deep eutectic solvent applied as a strain sensor

Yan

Lian

2022

J of Applied Polymer Sci

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Glycerin (Gly), a common by-product in petrochemical industry, is used as hydrogen bond donor. Green organic choline chloride (ChCl) as hydrogen bond acceptor. Natural deep eutectic solvent (NDES) can be prepared with Gly and ChCl. Subsequently, a starch/NDES ionic gel is prepared by in situ free radical polymerization of acrylamide monomer in NDES with starch as the reinforcement. The effects of amylose content in starch and starch addition amount on mechanical properties of ionic gel are analyzed. The results show that starch could be partially dissolved and dispersed in NDES. Compared with the tensile strength of pure NDES gel (about 15 kPa), the tensile strength of starch/NDES ionic gel is increased by 6 times to 90 kPa. It shows good selfrecovery performance after 20 compression cycles. Starch/NDES ionic gel has good thermal stability and frost resistance. In addition, CS4 starch/NDES ionic gel has the highest conductivity. At the same time, starch/NDES ionic gel has been successfully applied to monitor grasping motion of hand, which has the potential of strain sensor. It provides a new green method for the design of electronic products such as electronic skin.

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Extremely stretchable, sticky and conductive double-network ionic hydrogel for ultra-stretchable and compressible supercapacitors

Cited by 103 publications

References 57 publications

Fundamental Concepts of Hydrogels: Synthesis, Properties, and Their Applications

Fundamental Concepts of Hydrogels: Synthesis, Properties, and Their Applications

Printable and Recyclable Conductive Ink Based on a Liquid Metal with Excellent Surface Wettability for Flexible Electronics

A stretchable, compressible and anti‐freezing ionic gel based on a natural deep eutectic solvent applied as a strain sensor

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