High performance solid state supercapacitor based on a 2-mercaptopyridine redox-mediated gel polymer

Sun, Kanjun; Dong, Miaomiao; Feng, Enke; Peng, Hui; Ma, Guofu; Zhao, Guang‐Chao; Lei, Ziqiang

doi:10.1039/c4ra15484c

Cited by 38 publications

(20 citation statements)

References 41 publications

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“…The electrolyte with 6 wt% Al 2 O 3 showed the highest ionic conductivity due to the uniform dispersion of nanoparticles in the gel and enhanced the amorphic nature of the polymer. Sun et al [16] added a novel redox additive PySH (2-mercapto pyridine) into the gel polymer electrolyte based on PVA/H 3 PO 4 /H 2 O, which dramatically increased ion diffusion and improved tensile and bending properties. Gao and coworkers [17] proved an enhancement in ionic conductivity of SiWA/H 3 PO 4 /PVA gel electrolyte in the presence of nano-SiO 2 and nano-TiO 2 fillers.…”

Section: Introductionmentioning

confidence: 99%

Performance-tuning of PVA-based gel electrolytes by acid/PVA ratio and PVA molecular weight

et al. 2021

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The significant breakthroughs of flexible gel electrolytes have attracted extensive attention in modern wearable electronic gadgets. The lack of all-around high-performing gels limits the advantages of such devices for practical applications. To this end, developing a multi-functional gel architecture with superior ionic conductivity while enjoying good mechanical flexibility is a bottleneck to overcome. Herein, an architecturally engineered gel, based on PVA and H3PO4 with different molecular weights of PVA for various PVA/H3PO4 ratios, was developed. The results show the dependence of ionic conductivity on molecular weight and also charge carrier concentration. Consequently, fine-tuning of PVA-based gels through a simple yet systematic and well-regulated strategy to achieve highly ion-conducting gels, with the highest ionic conductivity of 14.75 ± 1.39 mS cm-1 have been made to fulfill the requirement of flexible devices. More importantly, gel electrolytes possess good mechanical robustness while exhibiting high-elasticity (%766.66 ± 59.73), making it an appropriate candidate for flexible devices.

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Section: Introductionmentioning

confidence: 99%

Performance-tuning of PVA-based gel electrolytes by acid/PVA ratio and PVA molecular weight

et al. 2021

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“…The bulk conductivity (σ) of the prepared doped hydrogels is 76, 48, 36 and 34 mS/cm for PEA, PGGA, κC and CMC, respectively. It is worth noting that the conductivity of these biohydrogels is comparable to those reported for PVA-containing hydrogels; for instance, PVA doped with H 3 PO 4 or H 2 SO 4 (11.6 or 7.1 mS/cm, respectively), [ 41 , 42 ] PVA doped with H 3 PO 4 and 2-mercaptopyridine (22.6 mS/cm), [ 41 ] PVA doped with H 2 SO 4 and indigo carmine or alizarin red S (20.3 or 33.1 mS/cm, respectively), [ 43 ] chemically crosslinked PVA-poly(ethylene glycol) (67.1 mS/cm) [ 44 ] and KCl doped boron cross-linked PVA (38 mS/cm). [ 45 ] Moreover, the ionic conductivity of a 0.1 M NaCl aqueous solution is ~20 mS/cm, a concentration of 1 M NaCl being required to obtain a value comparable to that of doped PEA hydrogel [ 46 ].…”

Section: Resultsmentioning

confidence: 68%

Electrical and Capacitive Response of Hydrogel Solid-Like Electrolytes for Supercapacitors

et al. 2021

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Flexible hydrogels are attracting significant interest as solid-like electrolytes for energy storage devices, especially for supercapacitors, because of their lightweight and anti-deformation features. Here, we present a comparative study of four ionic conductive hydrogels derived from biopolymers and doped with 0.1 M NaCl. More specifically, such hydrogels are constituted by κ-carrageenan (κC), carboxymethyl cellulose (CMC), poly-γ-glutamic acid (PGGA) or a phenylalanine-containing polyesteramide (PEA). After examining the morphology and the swelling ratio of the four hydrogels, which varies between 483% and 2356%, their electrical and capacitive behaviors were examined using electrochemical impedance spectroscopy. Measurements were conducted on devices where a hydrogel film was sandwiched between two identical poly(3,4-ethylenedioxythiophene) electrodes. The bulk conductivity of the prepared doped hydrogels is 76, 48, 36 and 34 mS/cm for PEA, PGGA, κC and CMC, respectively. Overall, the polyesteramide hydrogel exhibits the most adequate properties (i.e., low electrical resistance and high capacitance) to be used as semi-solid electrolyte for supercapacitors, which has been attributed to its distinctive structure based on the homogeneous and abundant distribution of both micro- and nanopores. Indeed, the morphology of the polyestermide hydrogel reduces the hydrogel resistance, enhances the transport of ions, and results in a better interfacial contact between the electrodes and solid electrolyte. The correlation between the supercapacitor performance and the hydrogel porous morphology is presented as an important design feature for the next generation of light and flexible energy storage devices for wearable electronics.

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“…Therefore, the redox-mediated electrolyte has a good application prospect in improving the electrochemical performance of SCs (Sun et al, 2016). Sun et al (2015a) prepared a redox-mediated gel polymerpolyvinyl alcohol-orthophosphate 2-mercaptopyridine (PVA-H 3 PO 4 -PySH) by introducing PySH into PVA-H 3 PO 4 . The ionic conductivity of the PVA-H 3 PO 4 -PySH system was increased by 92% to 22.57 mS cm −1 .…”

Section: Redox Mediated Gel Electrolytesmentioning

confidence: 99%

A Review of Redox Electrolytes for Supercapacitors

et al. 2020

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Supercapacitors (SCs) have attracted widespread attention due to their short charging/discharging time, long cycle life, and good temperature characteristics. Electrolytes have been considered as a key factor affecting the performance of SCs. They largely determine the energy density based on their decomposition voltage and the power density from their ionic conductivity. In recent years, redox electrolytes obtained a growing interest due to an additional redox activity from electrolytes, which offers an increased charge storage capacity in SCs. This article summarizes the latest progress in the research of redox electrolytes, and focuses on their properties, mechanisms, and applications based on different solvent types available. It also proposes potential solutions for how to effectively increase the energy density of the SCs while maintaining their high power and long life.

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High performance solid state supercapacitor based on a 2-mercaptopyridine redox-mediated gel polymer

Abstract: A novel gel polymer PVA-H3PO4-PySH is prepared through introducing redox-mediated PySH into PVA-H3PO4 host, and a solid state supercapacitor is fabricated using the gel polymer as electrolyte and separator, activated carbons as electrodes.

Cited by 38 publications

References 41 publications

Performance-tuning of PVA-based gel electrolytes by acid/PVA ratio and PVA molecular weight

Performance-tuning of PVA-based gel electrolytes by acid/PVA ratio and PVA molecular weight

Electrical and Capacitive Response of Hydrogel Solid-Like Electrolytes for Supercapacitors

A Review of Redox Electrolytes for Supercapacitors

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