Deep insight into ionic transport in polyampholyte gel electrolytes towards high performance solid supercapacitors

Liu, Dong; Xu, Zuyan; Ji, Xingxiang; Liu, Libin; Gai, Guangjie; Yang, Jian‐Bo; Wang, Jijun

doi:10.1039/c9ta01208g

Cited by 23 publications

(12 citation statements)

References 54 publications

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“…As shown in Figure S7 (Supporting Information), the polyAS-EG 45 electrolyte can be adhered to the surface of various materials, including metal, glass, plastic and PTFE. The adhesion strength of polyAS-EG 45 electrolyte to carbon cloth can reach ≈180 N m −1 (Figure 3d), which is much higher than that of the electrolyte reported in our previous work [49] and others' work [50] and can provide sufficient stickiness to bind two electrodes together. In addition, the polyAS-EG 45 electrolyte shows excellent water retention ability and still has 81% water retention after seven days of exposure to air (Figure S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 55%

Antifreezing Proton Zwitterionic Hydrogel Electrolyte via Ionic Hopping and Grotthuss Transport Mechanism toward Solid Supercapacitor Working at −50 °C

Sun

Qiao

et al. 2022

Advanced Science

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Hydrogel electrolyte is widely used in solid energy storage devices because of its high ionic conductivity, environmental friendliness, and non-leakage property. However, hydrogel electrolyte is not resistant to freezing. Here, a high proton conductive zwitterionic hydrogel electrolyte with super conductivity of 1.51 mS cm -1 at −50 °C is fabricated by random copolymerization of acrylamide and zwitterionic monomer in the presence of 1 m H 2 SO 4 and ethylene glycol (EG). The antifreezing performance and low temperature conductivity are ascribed to hydrogen bonds and ionic bonds between the components and water molecules in the system and can be tuned by changing the monomer ratio and EG contents. The proton hopping migration on the ionic group of the polymer chains and Grotthuss proton transport mechanism are responsible for the high proton conductivity while Grotthuss transport is dominated at the glassy state of the polymer chains. The electrolyte-assembled supercapacitor (SC) offers high specific capacitance of 93.5 F g -1 at 25 °C and 62.0 F g -1 at −50 °C with a capacitance retention of 91.1% and 81.5% after 10 000 cycles, respectively. The SC can even work at −70 °C. The electrolyte outperforms most reported antifreezing hydrogel electrolytes and has high potential in low-temperature devices.

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Section: Resultsmentioning

confidence: 55%

Antifreezing Proton Zwitterionic Hydrogel Electrolyte via Ionic Hopping and Grotthuss Transport Mechanism toward Solid Supercapacitor Working at −50 °C

Sun

Qiao

et al. 2022

Advanced Science

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“…In order to ensure sufficient sensitivity, a strain of 1 % is applied in the linear viscoelastic region for viscoelasticity measurement. For H 2 D 4 S 4 hydrogel, the G′ increases and is always larger than G′′, which shows that the hydrogel mainly deforms elastically, showing a solid behavior (Figure b) . This indicates that the electrostatic interaction combined with the hydrogen bonds between the ionic groups make the hydrogel have sufficient mechanical strength at low water content.…”

Section: Resultsmentioning

confidence: 91%

Fatigue‐Resistant, Notch‐Insensitive Zwitterionic Polymer Hydrogels with High Self‐Healing Ability

Yang

et al. 2020

ChemPlusChem

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Introducing self-healing properties into hydrogels can prolong their application lifetime. However, achieving mechanical strength without sacrificing self-healing properties is still a major challenge. We prepared a series of zwitterionic polymer hydrogels by random copolymerization of zwitterionic ionic monomer (SBMA), cationic monomer (DAC) and hydrophilic monomer (HEMA). The ionic bonds and hydrogen bonds formed in the hydrogels can efficiently dissipate energy and rebuild the network. The resulting hydrogels show high mechanical strength (289-396 KPa of fracture stress, 433-864 % of fracture stress) and have great fatigue resistance. The hydrogel with a 1 : 1 molar ratio of SBMA:DAC possesses the best self-healing properties (self-healing efficiency up to 96.5 % at room temperature for 10 h). The self-healing process is completely spontaneous and does not require external factors to assist. In addition, the hydrogel also possesses notch insensitivity with a fracture energy of 12000 J m À 2. After combining the conductivity of RGO aerogel, the hydrogel/RGO composites show good strain sensitivity with high reliability and self-healing ability, which has certain significance in broadening the application of these zwitterionic hydrogels.

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“…However, with the whole system reaching to thermodynamic equilibrium, when the LiCl concentration surpasses 2.5 m , the ionic conductivity falls with the increasing LiCl concentration, which may be caused by the formation of Li + (H 2 O) 2 clusters, occupying free lithium ions, hindering the ion transport, therefore decreasing the conductivity. [ 43 ]…”

Section: Resultsmentioning

confidence: 99%

Environmentally Compatible Wearable Electronics Based on Ionically Conductive Organohydrogels for Health Monitoring with Thermal Compatibility, Anti‐Dehydration, and Underwater Adhesion

Niu

Liu

et al. 2021

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Hydrogel‐based electronics have found widespread applications in soft sensing and health monitoring because of their remarkable biocompatibility and mechanical features similar to human skin. However, they are subjected to potential challenges like structural failure, functional degradation, and device delamination in practical applications, especially facing extreme environmental conditions (e.g., abnormal temperature and humidity). To address these, ionically conductive organohydrogel‐based soft electronics are developed, which can perform at subzero and elevated temperatures (thermal compatibility) as well as at dehydrated and hydrated environments (hydration compatibility) for extended applications. More specifically, gelatin/poly(acrylic acid–N‐hydrosuccinimide ester) (PAA–NHS ester)‐based ionic‐conductive organohydrogel is synthesized. By introducing a glycerol–water binary solvent system, the gel can maintain mechanical softness in a wide temperature range (from −80 to 60 °C). Besides, excellent conductivity is achieved under various conditions by soaking the gel into lithium chloride anhydrous (LiCl) solution. Strong adhesion with skin, even under water, can be realized by covalent bonds between NHS ester from gel and amino groups from human skin. The excellent performances of LiCl‐loaded PAA‐based organohydrogel (L‐PAA‐OH)‐based electronics are further demonstrated under freezing and high temperatures as well as underwater conditions, unveiling their promising prospects in wearable health monitoring in various conditions.

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Deep insight into ionic transport in polyampholyte gel electrolytes towards high performance solid supercapacitors

Abstract: A novel polyampholyte gel electrolyte with high ionic conductivity and high mechanical strength was developed and was suitable for supercapacitors.

Cited by 23 publications

References 54 publications

Antifreezing Proton Zwitterionic Hydrogel Electrolyte via Ionic Hopping and Grotthuss Transport Mechanism toward Solid Supercapacitor Working at −50 °C

Antifreezing Proton Zwitterionic Hydrogel Electrolyte via Ionic Hopping and Grotthuss Transport Mechanism toward Solid Supercapacitor Working at −50 °C

Fatigue‐Resistant, Notch‐Insensitive Zwitterionic Polymer Hydrogels with High Self‐Healing Ability

Environmentally Compatible Wearable Electronics Based on Ionically Conductive Organohydrogels for Health Monitoring with Thermal Compatibility, Anti‐Dehydration, and Underwater Adhesion

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