1.8 V Aqueous Symmetric Carbon-Based Supercapacitors with Agarose-Bound Activated Carbons in an Acidic Electrolyte

Lai, Chih‐Chung; Hsu, Feng-Hao; Hsu, Su-Yang; Deng, Ming-Jay; Lu, Kueih‐Tzu; Chen, Jin‐Ming

doi:10.3390/nano11071731

Cited by 20 publications

(11 citation statements)

References 35 publications

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“…Cellulose and its derivatives such as carboxymethylcellulose (CMC) have been extensively applied as a green, abundant and cheap binder in supercapacitors and lithium-ion batteries [ 15 , 16 ]. Other examples range from chitosan [ 17 ] and sodium alginate [ 18 ], over starch [ 19 ] and guar gum [ 20 ] to tragacanth gum [ 21 ], agarose [ 22 ] and casein [ 23 ]. Carbonaceous fillers such as activated carbon, graphene or its down-grade form as reduced graphene oxide have been used for the fabrication of electrodes for supercapacitors in sandwich and planar structures [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

et al. 2021

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Environmentally friendly energy storage devices have been fabricated by using functional materials obtained from completely renewable resources. Gelatin, chitosan, casein, guar gum and carboxymethyl cellulose have been investigated as sustainable and low-cost binders within the electrode active material of water-processable symmetric carbon-based supercapacitors. Such binders are selected from natural-derived materials and industrial by-products to obtain economic and environmental benefits. The electrochemical properties of the devices based on the different binders are compared by using cyclic voltammetry, galvanostatic charge/discharge curves and impedance spectroscopy. The fabricated supercapacitors exhibit series resistance lower than a few ohms and values of the specific capacitance ranged between 30 F/g and 80 F/g. The most performant device can deliver ca. 3.6 Wh/kg of energy at a high power density of 3925 W/kg. Gelatin, casein and carboxymethyl cellulose-based devices have shown device stability up to 1000 cycles. Detailed analysis on the charge storage mechanisms (e.g., involving faradaic and non-faradaic processes) at the electrode/electrolyte interface reveals a pseudocapacitance behavior within the supercapacitors. A clear correlation between the electrochemical performances (e.g., cycle stability, capacitance retention, series resistance value, coulombic efficiency) ageing phenomena and charge storage mechanisms within the porous carbon-based electrode have been discussed.

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Section: Introductionmentioning

confidence: 99%

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

et al. 2021

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“…The PPy-MnO 2 -CC flexible SSC device has high capacitance retention after obtaining the high current density (20 A/g) to be ascribed to two key factors: (1) the PPy in the composite electrode could enhances the urea-LiClO 4 -PVA polymer gel achievability that is valuable to the rapid redox reaction; (2) the novel conducting networks decrease the ion/electron diffusion pathways across the active material, improving the electrode conduction for greater reaction kinetics. A maximum energy density of 165.3 Wh/kg was carried at a power density of 1.0 kW/kg according to Equations (2) and (3), which is better than that of the majority of previously reported SSCs, including PPy-coated carbon nanotube/cotton hybrid fabric SSCs (12.6 Wh/kg, 95% after 5000 cycles) [ 32 ], agarose-bound activated carbons SSCs (13.5 Wh/kg, 94.2% after 10,000 cycles) [ 26 ], self-assembled graphene foam (13.5 Wh/kg, 81% after 3000 cycles) [ 33 ], V 2 O 5 -PPy composite/CC//V 2 O 5 -PPy composite/CC SSC (82.0 Wh/kg, 75% after 5000 cycles) [ 34 ], V 2 O 5 -PANI composite//V 2 O 5 -PANI composite SSCs (69.2 Wh/kg, 92% after 5000 cycles) [ 35 ], activated CF//activated CF SSCs (4.0 Wh/kg, 80% after 10,000 cycles) [ 36 ], PPy/black phosphorus SSCs (30.8 Wh/kg, 95% after 10,000 cycles) [ 37 ], and MnO 2 @PANI/GF// MnO 2 @PANI/GF SSCs (37.0 Wh/kg, 89% after 5000 cycles) [ 38 ]. Meanwhile, we also achieved a maximum power density of 21.0 kW/kg at a reasonable energy density of 86.4 W h/kg.…”

Section: Resultsmentioning

confidence: 92%

“…All cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) curves, and cycling stability measurements were obtained using a potentiostat/galvanostat instrument (PGSTAT 128N, Autolab, Utrecht, The Netherlands). The specific capacitances ( C sp , F/g) of the solid-state SSCs obtained from the CV curves were determined according to the following [ 11 , 26 ]: C sp = specific voltammetric charge /∆V where ∆V denotes the operating potential range. Here, the specific voltammetric charge (per gram of the active materials contained in two electrodes) was integrated from positive to negative scans of the CV.…”

Section: Methodsmentioning

confidence: 99%

“…Here, the specific voltammetric charge (per gram of the active materials contained in two electrodes) was integrated from positive to negative scans of the CV. Both the energy density (E, W h/kg) and the power density (P, W h/kg) were measured according to the following [ 11 , 26 ]: E = 1/2 C sp ∆V 2 P = E/∆t where ∆V, ∆t are the operating potential of the SSC and the discharge time.…”

Section: Methodsmentioning

confidence: 99%

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Enhanced Pseudocapacitive Performance of Symmetric Polypyrrole-MnO2 Electrode and Polymer Gel Electrolyte

et al. 2021

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Herein, the nanostructured polypyrrole-coated MnO2 nanofibers growth on carbon cloth (PPy-MnO2-CC) to serve as the electrodes used in conjunction with a quasi-ionic liquid-based polymer gel electrolyte (urea-LiClO4-PVA) for solid-state symmetric supercapacitors (SSCs). The resultant PPy-MnO2-CC solid-state SSCs exhibited a high specific capacitance of 270 F/g at 1.0 A/g in a stable and wide potential window of 2.1 V with a high energy/power density (165.3 Wh/kg at 1.0 kW/kg and 21.0 kW/kg at 86.4 Wh/kg) along with great cycling stability (capacitance retention of 92.1% retention after 3000 cycles) and rate capability (141 F/g at 20 A/g), exceeding most of the previously reported SSCs. The outstanding performance of the studied 2.1 V PPy-MnO2-CC flexible SSCs could be attributed to the nanostructured PPy-coated MnO2 composite electrode and the urea-LiClO4-PVA polymer gel electrolyte design. In addition, the PPy-MnO2-CC solid-state SSCs could effectively retain their electrochemical performance at various bending angles, demonstrating their huge potential as power sources for flexible and lightweight electronic devices. This work offers an easy way to design and achieve light weight and high-performance SSCs with enhanced energy/power density.

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“…The specific energy density (Wh kg –1 ) and power density (W kg –1 ) of the fabricated symmetric supercapacitor cell were calculated using the formulas, E = 1 2 × C cell × false( normalΔ V false) 2 P = E normalΔ t where, C Cell is the cell capacitance (in F g –1 ), which is equal to the one-quarter of the specific capacitance value ( C sp ), Δ V is the operating potential window of the fabricated cell (V), and Δ t is the discharge time (h).…”

Section: Methodsmentioning

confidence: 99%

Low-Grade Coal Feedstock for the Synthesis of High-Valued Graphene Derivatives for Energy Storage Application

2023

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Coal has been widely used as a fuel, albeit associated with environmental issues. Therefore, the research on nonfuel applications such as coal to chemicals and materials has been increased to reduce its environmental impacts without forfeiting its economic benefit. In this work, chemically impure and undervalued low-grade coal from the Northeast region (NER) of India is utilized as a carbonaceous precursor for the synthesis of valuable graphene derivatives. The synthetic process consists of a simple chemical approach combined with the ultracentrifugation technique. Electron microscopy of the synthesized graphene derivative reveals the presence of few-layered graphene with an interlayer distance (dvalue) of 0.348 nm. The Raman, UV−vis, and FTIR functional group analyses of the products further confirm the graphene formation from such coal. The synthesized graphene derivative was also tested as an electrode material in a supercapacitor cell, where it shows excellent electrochemical behavior with a maximum specific capacitance value of 95.65 F g −1 at 0.5 A g −1 current density with a good capacitance retention of 70% at 10 A g −1 . The resultant maximum energy density and power density are 5 Wh kg −1 and 6.00 kW kg −1 , respectively. This study demonstrates that the low-grade and pollutive coal feedstock can have environmentally green and sustainable utilization as a suitable precursor for valuable graphene derivatives with excellent potential in energy storage and other value-added applications.

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1.8 V Aqueous Symmetric Carbon-Based Supercapacitors with Agarose-Bound Activated Carbons in an Acidic Electrolyte

Cited by 20 publications

References 35 publications

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

Enhanced Pseudocapacitive Performance of Symmetric Polypyrrole-MnO2 Electrode and Polymer Gel Electrolyte

Low-Grade Coal Feedstock for the Synthesis of High-Valued Graphene Derivatives for Energy Storage Application

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