Towards kilohertz electrochemical capacitors for filtering and pulse energy harvesting

Fan, Zhaoyang; Islam, Nazifah; Bayne, Stephen

doi:10.1016/j.nanoen.2017.06.048

Cited by 95 publications

(97 citation statements)

References 159 publications

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“…With the increment of voltage, supercapacitor exhibits a much faster decay of capacitance because C vol of supercapacitor is inversely proportional to the square of voltage

(C_{v o l} \propto V^{- 2})

, whereas that of AEC is inversely proportional to the voltage

(C_{v o l} \propto V^{- 2})

. Most importantly, CWF supercapacitor demonstrates a volumetric capacitance over commercial AECs up to ∼1000 V (Figure d), significantly higher than those in previous literatures (maximum of ∼250 V).…”

Section: Resultsmentioning

confidence: 59%

“…The CV curves measured at scan rates of 40, 60 and 80 V s −1 are presented in Figure S4. The slight deviation at high scan rates (>80 V s −1 ) was mainly attributed to the inherently limited ionic conductivity of RTILs ,. As shown in Figure c, GCD curves present triangular curves at different current densities, in which no noticeable internal resistance (IR) drop could be observed even at a high current density of 15.0 mA cm −2 .…”

Section: Resultsmentioning

confidence: 89%

“…In addition to the frequency response, it's highly desirable to prepare supercapacitor with wide voltage window for AC line filtering ,. Under an operating voltage of 4.0 V (Figure d), the volumetric capacitance C vol of our CWF supercapacitor is 480 mF cc −1 , which is ∼250 folds higher than that of commercial AEC device (1.88 mF cc −1 ).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Hierarchical, Vertically‐Oriented Carbon Nanowall Foam Supercapacitor using Room Temperature Ionic Liquid Mixture for AC Line Filtering with Ultrahigh Energy Density

Yang

et al. 2019

ChemElectroChem

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Supercapacitors have been considered as a promising alternative of aluminum electrolytic capacitors (AECs) for AC line filtering applications. However, realizing supercapacitors with fast frequency response and superior energy density still remains an open issue. Herein, we demonstrate a hierarchical, vertically‐oriented carbon nanowall foam (CWF) supercapacitor using mixed room temperature ionic liquids (RTILs) for high‐performance AC line filtering. Hierarchical CWF exhibits macrospores as electrolyte reservoirs to shorten ion transport distance, vertically‐oriented, open channels to enable fast ion diffusion and consecutive scaffolds to promote electron transfer. CWF supercapacitor using RTIL mixture realizes a recorded‐high areal energy density of 1.23 μWh cm−2 at 120 Hz (almost ∼2.0 times/∼10.0 times larger than those of organic/aqueous electrolytes, respectively) and fast frequency response (RC time constant=∼1.3 ms). More importantly, CWF supercapacitor achieves a capacitance advantage over commercial AECs up to 1,000 V, substantially larger than those reported in state‐of‐the‐art literatures (maximum of ∼250 V).

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“…With the increment of voltage, supercapacitor exhibits a much faster decay of capacitance because C vol of supercapacitor is inversely proportional to the square of voltage

(C_{v o l} \propto V^{- 2})

, whereas that of AEC is inversely proportional to the voltage

(C_{v o l} \propto V^{- 2})

Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hierarchical, Vertically‐Oriented Carbon Nanowall Foam Supercapacitor using Room Temperature Ionic Liquid Mixture for AC Line Filtering with Ultrahigh Energy Density

Yang

et al. 2019

ChemElectroChem

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“…The high scan rate of 200 V s −1 indicates that the CNS‐LSG supercapacitor can be charged–discharged within 5 ms. Besides, the highest scan rate of 200 V s −1 for CNS‐LSG is three orders of magnitude higher than traditional AC supercapacitor, since AC supercapacitor can be only scanned to 0.1 V s −1 due to low conductivity of AC and the high diffusion resistance of the pores in AC . Also, the current response of CNS‐LSG has almost linear relationship with scan rate up to 100 V s −1 demonstrating its quasi‐ideal capacitive behavior (Figure S7, Supporting Information).…”

mentioning

confidence: 99%

“…The other direction is developing high‐power supercapacitor which bridges the gap between commercial activated carbon (AC) supercapacitor and aluminum electrolytic capacitor. In fact, high‐power supercapacitors serve an important role as they can be used in frequency regulation of intermittent renewable‐energy‐supported electrical grids and electronic circuits …”

mentioning

confidence: 99%

3D Laser Scribed Graphene Derived from Carbon Nanospheres: An Ultrahigh‐Power Electrode for Supercapacitors

et al. 2019

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Laser scribed graphene (LSG) electrodes hold great potential as supercapacitor electrodes. However, the rate performance of LSGs has been limited by the micropore‐dominated electrode structure. Here, a new method is proposed to prepare LSG electrodes with a 3D porous framework dominated by meso‐ and macro‐pores, a property that enables exceptional rate performance. The process uses amorphous carbon nanospheres (CNS) as precursors, which, after laser scribing, are transformed into highly turbostratic graphitic carbon electrodes (henceforth denoted as CNS‐LSG) with a 3D framework structure dominated by meso‐ and macro‐pores. When used as electrodes in conventional supercapacitor devices, the CNS‐LSG electrodes exhibit a high volumetric power density of 28 W cm−3, which is 28 times higher than that of current commercial activated carbon supercapacitors, and is the highest among all the reported laser scribed/induced graphene electrodes.

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Vertically Oriented MXene Bridging the Frequency Response and Capacity Density Gap for AC‐Filtering Pseudocapacitors

Wen

Chen

et al. 2022

Adv Funct Materials

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Electrochemical capacitors (ECs) with high-rate characteristics demonstrate great promise for replacing bulky aluminum electrolytic capacitors with alternate current (AC)-filtering functions. Currently, the performance of AC-line filtering ECs is limited by the vast gap between the ionic transport kinetics and capacity density of electrode materials. Herein, vertically oriented MXene and reduced graphene oxide composite (VMG) electrodes are prepared by electrochemical co-deposition to bridge the performance gap for AC-line filtering ECs. Benefiting from the unique pseudocapacitive characteristic and vertically interconnected microstructure, the VMG-based EC exhibits an outstanding areal capacitance of 1.14 mF cm −2 with a phase angle of −80° at 120 Hz. Moreover, by utilizing the advantages of MXene at negative potential, an asymmetric pseudocapacitor is constructed with an energy density up to 805 µF V 2 cm −2 at 120 Hz, which can be further incorporated in portable and wearable devices with excellent environmental ripple filtering capability in diverse scenarios.

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Towards kilohertz electrochemical capacitors for filtering and pulse energy harvesting

Cited by 95 publications

References 159 publications

Hierarchical, Vertically‐Oriented Carbon Nanowall Foam Supercapacitor using Room Temperature Ionic Liquid Mixture for AC Line Filtering with Ultrahigh Energy Density

Hierarchical, Vertically‐Oriented Carbon Nanowall Foam Supercapacitor using Room Temperature Ionic Liquid Mixture for AC Line Filtering with Ultrahigh Energy Density

3D Laser Scribed Graphene Derived from Carbon Nanospheres: An Ultrahigh‐Power Electrode for Supercapacitors

Vertically Oriented MXene Bridging the Frequency Response and Capacity Density Gap for AC‐Filtering Pseudocapacitors

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