Low-Cost “Water-in-Deep Eutectic Solvent” Electrolyte for High-Performance Zinc Ion Hybrid Supercapacitors

Wang, Lele; Deng, Yongqi; Yan, Lifeng

doi:10.1021/acsaem.3c01737

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…[1] Supercapacitors represent one of the most reliable and costeffective solutions. [2] To enable their large-scale deployment, it is imperative to employ cost-effective, durable safe materials and electrolytes, [3] especially aqueous ones (for the latter) since they are intrinsically safe and compatible. With regards to stable materials in neutral aqueous electrolytes, activated carbon (AC) and manganese dioxide (MnO 2 ) in symmetrical, [4] asymmetrical, [5] or hybrid [6] systems have been successfully implemented.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Manganese Acetate Hydrate Solutions and Their Potential Use for Energy Storage Applications

Tachouaft,

Kahri,

Wang

et al. 2024

Batteries & Supercaps

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This study provides a comprehensive understanding of the thermal, volumetric, and transport properties of manganese acetate hydrate solutions and highlights their potential for use in energy storage applications. Noteworthy thermal behaviours, phase transitions, and strong interactions between manganese cations, acetate anions, and water molecules are observed. Transport properties reveal salt concentration's impact (0.4‐3.9 mol L‐1) on viscosity and conductivity, with higher concentrations (>2.5 mol L‐1) indicating increased interaction. The non‐Arrhenius behavior in conductivity is elucidated using the Vogel‐Fulcher‐Tammann model, accentuating the unique properties of these solutions compared to other aqueous electrolytes due to the role of acetate ligands. The formulated two‐electrode symmetric supercapacitors exhibit pseudocapacitive behavior, reversible redox reactions (Mn2+/Mn3+), and salt concentration‐dependent specific capacitance. Manganese acetate as an electrolyte leads to reversible MnO2 deposition, with concentration affecting redox reactions and capacitance. Molecular simulations support the observed electrochemical performance, emphasizing the Mn2+‐acetate complexation. Long‐term cycling experiments demonstrate stability over 2000 cycles, with a slight capacitance improvement (130 F g‐1) and gradual coulombic efficiency decrease (99%). These results underscore the potential of manganese acetate hydrate solutions as a stable and effective green electrolyte for energy storage applications.

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Section: Introductionmentioning

confidence: 99%

Characterization of Manganese Acetate Hydrate Solutions and Their Potential Use for Energy Storage Applications

Tachouaft,

Kahri,

Wang

et al. 2024

Batteries & Supercaps

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“…ETG electrolytes share the fundamental features of DESs including low cost, eco-friendly, superb thermal/chemical stability, nonflammability and ultrahigh safety. − Unfortunately, problems related to the preparation of ETG electrolytes still exist. First, the use of high water content DESs might cause Zn anode corrosion and side reactions . Second, ETG electrolytes are prepared using several polymers, such as poly(ethylene oxide) (PEO), poly(vinyl alcohol) (PVA), and polyacrylamide (PAM), exhibiting poor mechanical strength and low ionic conductivity. , Third, soaking the gel in a DES electrolyte to prepare ETG electrolyte is not only time-consuming, but also cannot guarantee the adequate ionic conductivity .…”

Section: Introductionmentioning

confidence: 99%

Cellulose Reinforced Eutectogel Electrolyte for Flexible Zinc-Ion Hybrid Supercapacitors

Zeng,

Yang,

Yang

et al. 2024

ACS Appl. Energy Mater.

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The eutectogel electrolyte has shown significant potential for zinc-ion hybrid supercapacitors (ZHSCs) due to its cost-effectiveness, temperature resistance, and high safety. However, the poor mechanical strength and complex preparation process of the eutectogel electrolyte have become the main barriers to the practical application of ZHSCs. Herein, we developed a cellulose reinforced polyacrylamide (PAM)-based eutectogel (CPG) electrolyte for ZHSCs via an in situ one-step radical polymerization process. The dispersed cellulosic fiber plays a crucial role in stabilizing the network structure and widening the pore size of eutectogel, which improves mechanical properties and ion transport rate. Furthermore, the ternary deep eutectic solvent including choline chloride, urea, ethylene glycol, and ZnCl 2 endows eutectogel with intrinsic thermal stability, antidrying (with weight remaining almost unchanged after 20 days), and antifreezing properties. Thus, the as-prepared eutectogel electrolyte exhibits decent mechanical properties (tensile strength of 35.3 kPa and compressive strength of 117.0 kPa), high zinc ion transference number (0.68), superb flexibility, and good adhesion. With these superiorities, the symmetric cell employing the CPG electrolyte achieves stable cycling over 1390 h, and the assembled flexible ZHSC demonstrates favorable mechanical deformation adaptability under various severe conditions and operational feasibility in a wide temperature range from −15 to 60 °C. This work offers a promising strategy for designing multifunctional eutectogel electrolytes for applications in flexible ZHSCs.

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Solvation Dynamics and Microheterogeneity in Deep Eutectic Solvents

Chatterjee,

Chowdhury,

Bagchi

2024

J. Phys. Chem. B

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Deep eutectic solvents have attracted considerable attention due to their unique properties and their potential to replace conventional solvents in diverse applications, such as catalysis, energy storage, and green chemistry. However, despite their broad use, the microscopic mechanisms governing solvation dynamics and the role of hydrogen bonding in deep eutectic solvents remain insufficiently understood. In this article, we present our contributions toward unravelling the micro heterogeneity within deep eutectic solvents by combining vibrational Stark spectroscopy and two-dimensional infrared spectroscopy with molecular dynamics simulations. Our findings demonstrate how the composition, constituents, and addition of water significantly influence the heterogeneous hydrogen bonding network and solvent dynamics within these systems. These insights provide valuable guidance for the design of next-generation solvents tailored to specific applications. By integrating experimental and computational approaches, this work sheds light on the intricate relationship between solvation dynamics and nanostructure in deep eutectic solvents, ultimately paving the way for innovative advances in solvent design.

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Low-Cost “Water-in-Deep Eutectic Solvent” Electrolyte for High-Performance Zinc Ion Hybrid Supercapacitors

Cited by 4 publications

References 46 publications

Characterization of Manganese Acetate Hydrate Solutions and Their Potential Use for Energy Storage Applications

Characterization of Manganese Acetate Hydrate Solutions and Their Potential Use for Energy Storage Applications

Cellulose Reinforced Eutectogel Electrolyte for Flexible Zinc-Ion Hybrid Supercapacitors

Solvation Dynamics and Microheterogeneity in Deep Eutectic Solvents

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