An ultrahigh performance supercapacitors based on simultaneous redox in both electrode and electrolyte

Zhang, You; Zu, Lei; Lian, Huiqin; Hu, Zhongkai; Jiang, Yanhua; Liu, Yang; Wang, Xiaodong; Cui, Xiuguo

doi:10.1016/j.jallcom.2016.09.302

Cited by 20 publications

(12 citation statements)

References 44 publications

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“…Calculation of the capacitance and resistance of the system at 0.01, 0.02, 0.05, 0.1, 0.2, and 0.5 m of KI solution shows that the specific capacitance and resistance of the supercapacitor exhibited optimal results at 0.05 m (3331 F g −1 ) as shown in Figure 10b,c). [35] Menzel et al studied the effect of I − concentration on the electrochemical performance of carbon-based symmetrical supercapacitors. Both the GCD and CV plots of the supercapacitors with alkali-activated carbon electrodes in different concentrations of NaI electrolyte are shown in Figure 11a,b.…”

Section: Concentration Effect Of Iodide Based Aarlementioning

confidence: 99%

Inorganic Aqueous Anionic Redox Liquid Electrolyte for Supercapacitors

Pang

Wang

2021

Adv Materials Technologies

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Energy storage system based on supercapacitors is known for its high power density but suffers low energy density. To address this issue, aqueous anionic redox liquid electrolyte (AARLE) has been explored to enhance the energy density of supercapacitors by taking advantage of AARLE's favorable features including fast transport of ions in the liquid medium and electrochemical charge transfer of the redox couple in the liquid electrolyte, which is expected to produce supercapacitors with desirable high density of energy and power. The past few years have witnessed the progress of AARLE in energy storage applications such as supercapacitors. Given the significant potential of AARLE in supercapacitors, in this article, the application of AARLE in different types of supercapacitors, including electrical double‐layer capacitors, pseudocapacitors, and asymmetric supercapacitors is reviewed. The performance of the supercapacitors that utilize AARLE with representative redox couple species such as Br−/Br3−, I−/I3−, I2/IO3−, S2−/Sx2−, Fe(CN)64−/Fe(CN)63− is summarized and systematically analyzed in terms of specific capacitance, energy density, power density, and cycling stability. The underlying mechanism of these representative anionic redox species is shown in supercapacitors. The advantages and disadvantages of each of these anionic redox species are discussed regarding delivering stable supercapacitors with high energy density and power density for practical applications. Finally, the challenge and opportunity of AARLE for supercapacitors are presented. It is hoped that this timely review on this critical topic can offer a new perspective for developing high‐performance supercapacitors by taking advantage of the anionic redox charge storage in the liquid electrolytes in the future.

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Section: Concentration Effect Of Iodide Based Aarlementioning

confidence: 99%

Inorganic Aqueous Anionic Redox Liquid Electrolyte for Supercapacitors

Pang

Wang

2021

Adv Materials Technologies

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“…[12][13][14][15] Most of the previousw ork has focused on the introduction of KI speciesi nt he electrolyte. [16][17][18][19] However,i nt he present study,w eh ave investigated the effect of KI addition on the surface of printed graphene electrodes.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Printed Paper‐Based Hybrid Micro‐Supercapacitor by using Graphene and Redox‐Active Electrolyte

et al. 2018

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Inspired by future needs of flexible, simple, and low-cost energy storage devices, smart graphene-based micro-supercapacitors on conventional Xerox paper substrates were developed. The use of redox-active species (iodine redox couple) was explored to further improve the paper device's performance. The device based on printed graphene paper itself already had a remarkable maximum volumetric capacitance of 29.6 mF cm (volume of whole device) at 6.5 mA cm . The performance of the hybrid electrode with redox-active potassium iodide at the graphene surface was tested. Remarkably, the hybrid device showed improved volumetric capacitance of 130 mF cm . The maximum energy density for a graphene+KI device in H SO electrolyte was estimated to be 0.026 mWh cm . Thus, this work offers a new simple, and lightweight micro-supercapacitor based on low-cost printed graphene paper, which will have great applications in portable electronics.

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“…This is because the total capacitance of an electrochemical supercapacitor is largely depended on the electrode with low capacitance [ 7 ]. On the other hand, since the capacitance of supercapacitor is resulted from both of the low electric double layers capacitance and high pseudo capacitance of redox active electrolyte, the electrochemical combination of carbon electrode and active electrolyte is unsatisfactory match [ 8 ]. In order to improve the high performance of supercapacitor, it is worth to explore well match between electrode and electrolyte as well as synergetic effect each other, for instance, electrochemical combinations of redox electrode and redox electrolyte.…”

Section: Introductionmentioning

confidence: 99%

“…Among these various systems, the polyaniline-based composite electrode-KI electrolyte electrochemical system has presented a maximum capacitance of 3331 F/g at 1 A/g of current density, and the retention rate of capacitance is 78% after 1000 cycles. However, the capacitance value is only 726 F/g in the two-electrode system [ 8 ]. Obviously, the retention of capacitance is far from satisfactory when we compare the cyclic stability of the pseudo capacitor with that of the electric double layers capacitors.…”

Section: Introductionmentioning

confidence: 99%

High Performance of Supercapacitor from PEDOT:PSS Electrode and Redox Iodide Ion Electrolyte

Gao

Cai

et al. 2018

Nanomaterials

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Insufficient energy density and poor cyclic stability is still challenge for conductive polymer-based supercapacitor. Herein, high performance electrochemical system has been assembled by combining poly (3,4-ethylenedioxythiophene) (PEDOT):poly (styrene sulfonate) (PSS) redox electrode and potassium iodide redox electrolyte, which provide the maximum specific capacity of 51.3 mAh/g and the retention of specific capacity of 87.6% after 3000 cycles due to the synergic effect through a simultaneous redox reaction both in electrode and electrolyte, as well as the catalytic activity for reduction of triiodide of the PEDOT:PSS.

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An ultrahigh performance supercapacitors based on simultaneous redox in both electrode and electrolyte

Cited by 20 publications

References 44 publications

Inorganic Aqueous Anionic Redox Liquid Electrolyte for Supercapacitors

Inorganic Aqueous Anionic Redox Liquid Electrolyte for Supercapacitors

Design and Fabrication of Printed Paper‐Based Hybrid Micro‐Supercapacitor by using Graphene and Redox‐Active Electrolyte

High Performance of Supercapacitor from PEDOT:PSS Electrode and Redox Iodide Ion Electrolyte

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