Controlled swelling of graphene films towards hierarchical structures for supercapacitor electrodes

Zhu, Yucan; Ye, Xingke; Jiang, Hedong; Xia, Jianxing; Yue, Ziyu; Wang, Liheng; Wan, Zhongquan; Jia, Chunyang; Yao, Xiaojun

doi:10.1016/j.jpowsour.2020.227851

Cited by 79 publications

(30 citation statements)

References 71 publications

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“…The ZIC can still deliver a gravimetric specific capacitance of 112.2 F g −1 even at a high current density of 60 A g −1 , demonstrating its superior rate capability. Notably, an ultrahigh power density of 48.8 kW kg −1 with a correspondingly high energy density of 40.4 Wh kg −1 can be achieved at a current density of 60 A g −1 , which is the highest value among the ZICs [ 11,13,15,19,20,22,37–43 ] and ZIBs [ 12,44–48 ] reported recently. Considering ZIC with PC800 cathode can deliver twice the energy density and six times the power density of the ZIC with commercial YP‐50F cathode (50.2 Wh kg −1 and 7.4 kW kg −1 ), [ 49 ] we believe our ZIC with PC800 cathode is a promising device for practical energy storage applications.…”

Section: Resultsmentioning

confidence: 99%

“…Comparison study for the electrochemical performances of PC700, PC800, and PC900 cathodes. a) CV curves recorded at a scan rate of 1 mV s −1 , b) GCD curves of PC800, c) the dependent galvanostatic specific capacities and d) capacitances of PC samples at current densities from 0.1 A g −1 to 20 A g −1 , e) the variation trends for gravimetric specific capacitances, atomic oxygen contents, and areal specific capacitances (normalized by the SSAs) with thermal treatment temperatures of PC samples, f) Ragone curve of PC800 compared with the maximum power density values of zinc ion energy storage devices (ZICs (♦): Zn//1 m Zn(CF 3 SO 3 ) 2 //bioderived porous carbon, [ 11 ] Zn//3M Zn(CFf 3 SO 3 ) 2 //graphene derived porous carbon, [ 13 ] Zn//1 m ZnSO 4 //layered B/N codoped porous carbon, [ 15 ] Zn//2 m ZnSO 4 //activated carbon (AC), [ 19 ] Zn//1 m ZnSO 4 //porous carbon, [ 20 ] Zn//1 m ZnSO 4 //hierarchical porous carbon (HPC), [ 22 ] Zn//2 m ZnSO 4 //AC, [ 37 ] Zn//2 m ZnSO 4 //HPC, [ 38 ] Zn//1 m ZnSO 4 //hollow carbon spheres, [ 39 ] Zn//2 m ZnSO 4 //AC, [ 40 ] Zn//2 m ZnSO 4 //AC, [ 41 ] Zn//2 m ZnSO 4 //graphene oxide film, [ 42 ] Zn//1 m ZnSO 4 //porous carbon nanoflake, [ 43 ] ZIBs (△): Zn//ZnCl 2 //PANI/carbon fiber, [ 12 ] Zn//2 m ZnSO 4 //PTO, [ 44 ] Zn//20 × 10 −3 m ZnSO 4 //CuHCF, [ 45 ] Zn//2 m ZnSO 4 //MnO 2 , [ 46 ] Zn//20 × 10 −3 m ZnSO 4 //CuZnHCF, [ 47 ] Zn//2 m ZnSO 4 //MXene‐rGO 2 , [ 48 ] and M denotes mol L −1 ) reported in recent years.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Zinc Ion Capacitors Enhanced by Redox Reactions of Porous Carbon Cathodes

Yin

Zhang

Wang

et al. 2020

Advanced Energy Materials

216

130

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storage systems are preferred due to their high safety and low capital cost. [2] However, commercial aqueous lead-and nickel-based rechargeable batteries possess low energy densities (≈45 Wh kg −1 for Pb-acid batteries; [3] ≈50 Wh kg −1 for Ni-Cd batteries [4]) and limited life spans, which increases the energy storage cost per unit energy output, [5,6] thus limits their practical applications. Zinc metal is considered as an ideal anode for aqueous energy storage devices because of its high theoretical capacity (gravimetric, 820 mAh g −1 ; volumetric, 5851 mAh cm −3), low potential (−0.76 V vs standard hydrogen electrode (SHE)), and high hydrogen evolution overpotential. [7] Zinc-based rechargeable batteries and capacitors are expected to be low-cost, long-life energy storage devices since they utilize inexpensive zinc metal anode and aqueous electrolytes. [8,9] However, most transition-metal oxide cathodes display limited cycle life due to dissolution and parasitic reactions, which deteriorate the cycling performance of zinc ion batteries. [10] Electrochemical zinc ion capacitors (ZICs) are hybrid supercapacitors consisting of zinc anodes and porous carbon cathodes. [11,12] On the one hand, theoretically, a porous carbon cathode has unlimited cycle life due to the adsorption/desorption charge storage mechanism without phase transition. [13] On the other hand, the zinc anode shows Faradaic reactions with infinite theoretical capacitance compared with a porous carbon cathode, which exerts the maximum electric double-layer capacitance (EDLC) of porous carbon cathode. [14] Nevertheless, in an aqueous ZIC system, commercial porous carbon has low capacity, energy density and power density (typical values are ≈55 mAh g −1 , 43.1 Wh kg −1 , and 12.0 kW kg −1 for YP-50F, Kuraray Chemical, Japan) [15] due to its EDLC dominated charge storage mechanism. [16,17] Therefore, novel porous carbon cathodes are designed to boost the electrochemical performances of full-cell ZIC. [18] Kang and coworkers reported a ZIC with activated carbon cathode and Zn anode in an aqueous ZnSO 4 electrolyte. [19] The assembled ZIC delivered a capacity of 272.3 F g −1 and a high power density of 14.9 kW kg −1 with a corresponding energy density of 30 Wh kg −1 in the operational voltage window of 0.2-1.8 V. Liu and coworkers employed a porous carbon cathode to assemble ZIC. The as-fabricated ZIC delivered a capacitance of 298.6 F g −1 , a maximum energy density of 82.36 Wh kg −1 , and a maximum power density of up to 3.76 kW kg −1 in the operating voltage Aqueous electrochemical zinc ion capacitors (ZICs) are promising next-generation energy storage devices because of their high safety, inexpensive raw materials, and long cycle life. Herein, an aqueous ZIC with superior performance is fabricated by employing an oxygen-rich porous carbon cathode. Excellent capacitance and energy density are obtained thanks to the electric double-layer capacitance of porous carbon, and additional pseudocapacitances originating from the variation in oxidation states ...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electrochemical Zinc Ion Capacitors Enhanced by Redox Reactions of Porous Carbon Cathodes

Yin

Zhang

Wang

et al. 2020

Advanced Energy Materials

216

130

View full text Add to dashboard Cite

show abstract

“…Similarly, Zhu et al. [ 61 ] synthesized the free‐standing GH films by a new approach of the graphene oxide films swelling. Because of the highly orientational hierarchical 3D graphene porous structure, the as‐fabricated symmetrical SCs based on GH films delivered an exceptional gravimetric specific capacitance (237.6 F g −1 at 1 A g −1 ) and areal specific capacitance (608 mF cm −2 at 1 mA cm −2 ) as well as an admirable rate property.…”

Section: Electrode Materials For Zicsmentioning

confidence: 99%

Recent Developments and Future Prospects for Zinc‐Ion Hybrid Capacitors: a Review

Tang

Yao

Zhu

2021

Advanced Energy Materials

252

112

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The design and development of advanced energy storage systems with both high energy/power densities and long cycling life have long been a research hotspot. Zinc‐ion hybrid capacitors (ZICs) are regarded as emerging and highly promising candidates, which originates from the combined advantages of zinc‐ion batteries (ZIBs) with large energy density and supercapacitors (SCs) with exceptional power density and cycle stability. This critical review comprehensively and systematically summarizes the fundamentals and recent advances of ZICs, including their compositions, two types of energy storage mechanisms, advantages and disadvantages of ZICs as well as their electrode materials, electrolytes and new types of devices. Moreover, the present challenges and future research directions of ZICs are proposed, which need further research. This review is expected to provide good guidance for the design and exploitation of high‐performance ZICs to realize their potential practical applications.

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“…However, the irreversible π‐π restacking of graphene sheets hinders their potential application in SCs. There are several ways of avoiding this restacking, for example, Zhu et al [96] . synthesized graphene hydrogel by controlling the swelling of graphene oxide films.…”

Section: Materials Developmentmentioning

confidence: 99%

Materials Development in Hybrid Zinc‐Ion Capacitors

et al. 2021

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High‐performance energy storage devices have an exceptional role in modern applications such as green transportation, consumer electronics and electrical systems. Recently, the hybrid supercapacitor has gained great interest among researchers that adopt a combination of capacitive and battery‐type electrodes to increase the energy density without sacrificing the power performance. Different types of hybrid energy storage devices have been reported recently including lithium‐ion capacitor (LIC), sodium‐ion capacitor (NIC) and potassium‐ion capacitor (KIC). However, these devices are based on alkali metals such as Li, Na and K which are extremely reactive and consistently used with flammable organic electrolytes that intensify serious safety issues. Hybrid devices based on multivalent ions including Mg2+, Ca2+, Al3+ and Zn2+ have achieved considerable attraction due to their rapid charge transfer kinetics and high capacity as well as energy density. Herein, we reviewed the recent developments in the anode and cathode materials of Zinc ion hybrid capacitors (ZICs). The design, construction and working of supercapacitor (SC), Zinc ion battery (ZIB) and ZIC have been discussed along with their charge storage mechanism. Finally, based on the published work, our views on future developmental opportunities have been discussed.

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Controlled swelling of graphene films towards hierarchical structures for supercapacitor electrodes

Cited by 79 publications

References 71 publications

Electrochemical Zinc Ion Capacitors Enhanced by Redox Reactions of Porous Carbon Cathodes

Electrochemical Zinc Ion Capacitors Enhanced by Redox Reactions of Porous Carbon Cathodes

Recent Developments and Future Prospects for Zinc‐Ion Hybrid Capacitors: a Review

Materials Development in Hybrid Zinc‐Ion Capacitors

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