Zinc ion trapping in a cellulose hydrogel as a solid electrolyte for a safe and flexible supercapacitor

Yang, Lvye; Song, Longfei; Feng, Yi; Mu, Chundi; Zhang, Pengcheng; Zhang, Xiongfei; Yao, Jianfeng

doi:10.1039/d0ta04360e

Cited by 100 publications

(77 citation statements)

References 43 publications

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“…electrolytes and the hybrid supercapacitor assembly is shown in Figure 18b [180]. Furthermore, allin-one supercapacitor fabrication is a new approach, where the electrodes and electrolytes are in very close contact.…”

Section: Polymer Hydrogel Electrolytes For Supercapacitorsmentioning

confidence: 99%

“…[178]. (b) Synthesis of physically crosslinked cellulose hydrogel electrolytes and zinc ion hybrid supercapacitor assembly [180].…”

Section: Polymer Hydrogel Electrolytes For Supercapacitorsmentioning

confidence: 99%

“…Hydrogel's ionic conductivity can be magnified with the introduction of ionizable functional Yang et al reported zinc ion hybrid supercapacitors using biodegradable cellulose-based hydrogel electrolytes containing highly concentrated zinc chloride. The supercapacitors achieved a specific capacitance of 193 mA h g −1 , an energy density of 192 W h kg −1 at a power density of 16,976 W kg −1 , and the supercapacitor could be stable and worked at −20 • C. Synthesis of the hydrogel electrolytes and the hybrid supercapacitor assembly is shown in Figure 18b [180]. Furthermore, all-in-one supercapacitor fabrication is a new approach, where the electrodes and electrolytes are in very close contact.…”

Section: Flexible Polymer Hydrogel Electrolytesmentioning

confidence: 99%

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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: Polymer Hydrogel Electrolytes For Supercapacitorsmentioning

confidence: 99%

“…[178]. (b) Synthesis of physically crosslinked cellulose hydrogel electrolytes and zinc ion hybrid supercapacitor assembly [180].…”

Section: Polymer Hydrogel Electrolytes For Supercapacitorsmentioning

confidence: 99%

Section: Flexible Polymer Hydrogel Electrolytesmentioning

confidence: 99%

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

et al. 2020

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“…As the cathode active materials for ZHCs, carbonous electrodes usually store the charge accompanied with rapid redox reactions on the surface, especially those carbon electrodes containing doped heteroatoms or oxygen functional groups [19,33,59,60] . In addition, some pseudocapacitive metal oxides or carbides could be also served as cathode active materials to further enhance the capacitive charge storage performance.…”

Section: Cathode Materialsmentioning

confidence: 99%

Recent Advances in Aqueous Zinc‐ion Hybrid Capacitors: A Minireview

2020

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The tremendous demand for wearable electronic systems drives increasing efforts devoted to research on portable electrochemical energy storage devices. Thanks to the environmental benignity, highly intrinsic safety and low cost, zinc‐ion based charge storage systems have attracted extensive attention recently. Zinc‐ion hybrid capacitors (ZHCs) stand for the electrochemical energy storage system with a capacitive electrode as cathode and a zinc metal as the anode. In this minireview, we summarize the history of aqueous ZHCs and present a comprehensive overview of the recent progress in the structure design, charge storage mechanisms and electrochemical properties of the cathode, anode, as well as the electrolytes and their effects on the electrochemical performance of final ZHCs. In the end, the current challenges and our perspectives on the future trends of this field are also briefly anticipated. The pertinent insights into the challenges on the electrodes and electrolyte systems could also shed some lights on other aqueous electrolyte based electrochemical charge storage systems.

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“…For instance, Kasprzak and coworkers used an ionic liquid/DMSO solvent system to dissolve cellulose to fabricate both hydrogel electrolytes and composite electrodes for an electrochemical double-layer capacitors (EDLC) [ 16 ]. More recently, Yan and coworkers presented flexible capacitors by coagulating a cellulose solution in ZnCl 2 water-in-salt media [ 17 ]. Through these strategies, the main structural support relies on hydrophobic interaction and/or entanglement forces that confer limited mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Self-Standing Cellulose-Based Hydrogel Electrolytes for Electrochemical Devices

et al. 2020

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The trend of research towards more sustainable materials is pushing the application of biopolymers in a variety of unexplored fields. In this regard, hydrogels are attracting significant attention as electrolytes for flexible electrochemical devices thanks to their combination of ionic conductivity and mechanical properties. In this context, we present the use of cellulose-based hydrogels as aqueous electrolytes for electrochemical devices. These materials were obtained by crosslinking of hydroxyethyl cellulose (HEC) with divinyl sulfone (DVS) in the presence of carboxymethyl cellulose (CMC), creating a semi-IPN structure. The reaction was confirmed by NMR and FTIR. The small-amplitude oscillatory shear (SAOS) technique revealed that the rheological properties could be conveniently varied by simply changing the gel composition. Additionally, the hydrogels presented high ionic conductivity in the range of mS cm−1. The ease of synthesis and processing of the hydrogels allowed the assembly of an all-in-one electrochromic device (ECD) with high transmittance variation, improved switching time and good color efficiency. On the other hand, the swelling ability of the hydrogels permits the tuning of the electrolyte to improve the performance of a printed Zinc/MnO2 primary battery. The results prove the potential of cellulose-based hydrogels as electrolytes for more sustainable electrochemical devices.

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Zinc ion trapping in a cellulose hydrogel as a solid electrolyte for a safe and flexible supercapacitor

Abstract: High concentrated ZnCl2 is trapped in a biodegradable cellulose hydrogel as electrolyte for a flexible zinc-ion hybrid supercapacitor (ZHS). Such ZHS has a wide electrochemical potential window and extremely high energy/power density.

Cited by 100 publications

References 43 publications

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

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

Recent Advances in Aqueous Zinc‐ion Hybrid Capacitors: A Minireview

Room-Temperature Self-Standing Cellulose-Based Hydrogel Electrolytes for Electrochemical Devices

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