A High‐Energy Aqueous Sodium‐Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes

Krishnamoorthy, Karthikeyan; Pazhamalai, Parthiban; Sahoo, Surjit; Lim, Jong Hwan; Choi, Kyung Hyun; Kim, Sang‐Jae

doi:10.1002/celc.201700690

Cited by 53 publications

(22 citation statements)

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“…The comparison of the voltage range of capacitors in different electrolyte environments is shown in Figure 3h, in which we can observe that most of the voltage ceilings in acidic, [6,13,[25][26][27] alkaline [3,4,28,29] and even organic electrolytes [30][31][32] were in the range from 1.0 to 1.5 V, and the voltage windows of many other aqueous ion capacitors such as aqueous lithium ion and sodium ion capacitor in recent research, reached 2.0 V. [33][34][35][36] In this work, the upper limits of voltage ranges have been enhanced to 2.2 and 2.5 V in "WiS" and Et 4 NBF 4 /PC electrolyte, respectively. Besides, both Zn-BP-WiS and Zn-BP-PC exhibited excellent cycling stability (more than 5000 and 9500 cycles) and outstanding Faraday capacitances (304 and 363.9 F g −1 at 0.5 A g −1 ).…”

Section: Resultsmentioning

confidence: 99%

Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors

Huang

Chen

et al. 2020

Advanced Energy Materials

179

124

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It is generally believed that supercapacitors are mainly characterized by high power density and low energy density; therefore, significant efforts have been focused on improving the energy density of electrode materials. [2,3] The potential windows of aqueous supercapacitors, especially for those based on acidic and alkaline electrolytes, are limited by their electrolyte decomposition voltage (1.23 V). Several researchers showed potentials reaching only ≈1 V, which heavily impeded the practical application of supercapacitors. [4][5][6] Two methods that have proven effective in resolving the narrow voltage range that results from water decomposition entail replacing the water electrolyte with "water in salt" (WiS) electrolytes and organic electrolytes, respectively. [7,8] The WiS electrolytes were proposed by Wang and co-workers in 2015, and their use expanded the potential window to ≈3.0 V due to the formation of an electrode-electrolyte interphase. [9] The close interaction between water molecules and the electrolyte in ultrahigh concentration makes it difficult for water to decompose, thus effectively broadening the electrochemical operating voltage range. As for the organic electrolytes, the influence of water electrolysis is exclusive, and the electrolyte operating voltage range only depends on its electrochemical stability voltage. [10][11][12] Following these two approaches, the potential windows can be effectively expanded, which is the basic requirement for supercapacitors to deliver a high output voltage.Another neglected property of supercapacitors is their self-discharge rate, the low capacity retention in open circuit state makes the supercapacitors less effective in practical applications. A general method was required to enhance the anti-self-discharge properties. The intrinsic reason for the fastself-discharge speed is that when both anode and cathode materials store electricity through adsorption behaviors, they have a barely satisfactory ion limiting ability and the ions adsorbed on the electrode during the charging process will soon diffuse into the electrolyte due to the concentration gradient. Hybrid ion capacitors can be constructed to inhibit self-discharge by incorporating insertion-type and conversion-type batterytype electrodes that have stronger force for limiting ions than through simple adsorption behaviors. For this, one of the Output voltage and self-discharge rate are two important performance indices for supercapacitors, which have long been overlooked, though these play a very significant role in their practical application. Here, a zinc anode is used to construct a zinc ion hybrid capacitor. Expanded operating voltage of the hybrid capacitor is obtained with novel electrolytes. In addition, significantly improved anti-self-discharge ability is achieved. The phosphorene-based zinc ion capacitor exploiting a "water in salt" electrolyte with a working potential can reach 2.2 V, delivering 214.3 F g −1 after 5000 cycles. The operating voltage is further extended to 2.5 V through the...

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Section: Resultsmentioning

confidence: 99%

Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors

Huang

Chen

et al. 2020

Advanced Energy Materials

179

124

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“…Aqueous‐based SICs have the advantage of better stability, lower cost, and higher safety. [ 94,95 ] However, the working potential region is narrow, leading to a poor energy density in the devices. Fortunately, the working voltage ranges of the organic electrolytes are wider.…”

Section: Characteristic Of Sodium‐ion Capacitors Devicesmentioning

confidence: 99%

Comprehensive Understanding of Sodium‐Ion Capacitors: Definition, Mechanisms, Configurations, Materials, Key Technologies, and Future Developments

Cai

Zou

Deng

et al. 2021

Advanced Energy Materials

131

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In the past 10 years, preeminent achievements and outstanding progress have been achieved on sodium‐ion capacitors (SICs). Early work on SICs focussed more on the electrochemical performance. While it is easy to confirm which specific electrodes exhibit excellent properties, it is difficult to understand the mechanisms which are most promising for the next generation of SICs. From the early research in supercapacitors iterations to the present well‐developed Na‐ion batteries, the evolution of the controversial pseudocapacitive mechanism for SICs has been full of breakthroughs and back tracing steps. Moreover, as the research has progressed and the interests have changed, different emphases on the different subdisciplines (cell configurations, flexible devices, and presodiation technologies) have increased. In this review, first, the electric double layer mechanism, battery‐type mechanism, and the controversial pseudocapacitance mechanism are systematically analyzed and compared. Subsequently, mechanism‐oriented SICs cell configurations with different cathode and anode mechanisms are discussed. Moreover, the characteristics and features of electrode materials in different SICs cell configurations are summarized. Finally, key technologies and possible future developments are discussed. This review summarizes SICs from a broad and macro perspective from mechanisms to cell configurations, from cathodes to anodes, and from history to future, and offers a deep understanding of SICs devices.

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“…Apart from above mentioned materials, many other battery‐type cathode have also been investigated in the field of NICs. Table 1 lists researches related to NICs using battery‐type cathode.…”

Section: Materials For Sodium‐ion Capacitorsmentioning

confidence: 99%

Advanced Materials for Sodium‐Ion Capacitors with Superior Energy–Power Properties: Progress and Perspectives

Zhang

et al. 2019

Small

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10. 1002/smll.201902843. Developing electrochemical energy storage devices with high energy-power densities, long cycling life, as well as low cost is of great significance. Sodium-ion capacitors (NICs), with Na + as carriers, are composed of a high capacity battery-type electrode and a high rate capacitive electrode. However, unlike their lithium-ion analogues, the research on NICs is still in its infancy. Rational material designs still need to be developed to meet the increasing requirements for NICs with superior energy-power performance and low cost. In the past few years, various materials have been explored to develop NICs with the merits of superior electrochemical performance, low cost, good stability, and environmental friendliness. Here, the material design strategies for sodium-ion capacitors are summarized, with focus on cathode materials, anode materials, and electrolytes. The challenges and opportunities ahead for the future research on materials for NICs are also proposed. www.advancedsciencenews.com www.small-journal.com to LICs, NICs are still in their infancy stage with many difficulties for their practical application. [23] For example, many battery-type electrode materials for lithium ion storage cannot meet the requirements of NIC devices due to the large size of Na + ions. In addition, due to the redox potential of Na/Na + is 0.3 V higher than that of Li/Li + , the working voltage ranges of NICs are expected to be a little narrower than LICs, which may influence the energy densities of NICs. Moreover, the electrolyte should provide a rapid migration process of Na + ions. Therefore, the rational material design will play crucial roles in the electrochemical performance improvement of NICs.So far, there are few papers which summarize the recent progress in NIC research area. In particular, the materials used in NICs, including anode, cathode, and electrolyte, have not been systematically reviewed. In this article, we focus on the latest advances in the cathode materials, anode materials, and electrolytes for NICs. First, we review the energy storage mechanism and demonstrate the configurations of NICs; then, we summarize the recent progress on electrode materials, including anode materials, cathode materials, as well as different electrolytes for NICs; finally, the challenges and future prospects for NIC research are proposed.

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A High‐Energy Aqueous Sodium‐Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes

Cited by 53 publications

References 50 publications

Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors

Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors

Comprehensive Understanding of Sodium‐Ion Capacitors: Definition, Mechanisms, Configurations, Materials, Key Technologies, and Future Developments

Advanced Materials for Sodium‐Ion Capacitors with Superior Energy–Power Properties: Progress and Perspectives

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