Current collectors for low resistance aqueous flexible printed supercapacitors

Arvani, Maedeh; Keskinen, Jari; Lupo, Donald; Honkanen, Mari

doi:10.1016/j.est.2020.101384

Cited by 45 publications

(22 citation statements)

References 17 publications

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“…The Nyquist curves of the ternary composites further confirms the capacitive characteristic. The intercept of the Z ’ real axis (beginning of the arc) at high frequency depicts the equivalent series resistance ( ESR ) which represents the combination of resistance at electrode/electrolyte and electrode/current collector interfaces [ 79 ]. As seen in the inset to Figure 8 e, PAC/MoO 2 /Mo 2 C-1 electrode depicts smaller ESR and R ct values of 0.59 and 1.01 Ω as compared to PAC/MoO 2 /Mo 2 C-0.5 (0.76 and 1.10 Ω) and PAC/MoO 2 /Mo 2 C-2 electrodes (1.31 and 1.84 Ω), respectively.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites

et al. 2021

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Biomass-waste activated carbon/molybdenum oxide/molybdenum carbide ternary composites are prepared using a facile in-situ pyrolysis process in argon ambient with varying mass ratios of ammonium molybdate tetrahydrate to porous peanut shell activated carbon (PAC). The formation of MoO2 and Mo2C nanostructures embedded in the porous carbon framework is confirmed by extensive structural characterization and elemental mapping analysis. The best composite when used as electrodes in a symmetric supercapacitor (PAC/MoO2/Mo2C-1//PAC/MoO2/Mo2C-1) exhibited a good cell capacitance of 115 F g−1 with an associated high specific energy of 51.8 W h kg−1, as well as a specific power of 0.9 kW kg−1 at a cell voltage of 1.8 V at 1 A g−1. Increasing the specific current to 20 A g−1 still showcased a device capable of delivering up to 30 W h kg−1 specific energy and 18 kW kg−1 of specific power. Additionally, with a great cycling stability, a 99.8% coulombic efficiency and capacitance retention of ~83% were recorded for over 25,000 galvanostatic charge-discharge cycles at 10 A g−1. The voltage holding test after a 160 h floating time resulted in increase of the specific capacitance from 74.7 to 90 F g−1 at 10 A g−1 for this storage device. The remarkable electrochemical performance is based on the synergistic effect of metal oxide/metal carbide (MoO2/Mo2C) with the interconnected porous carbon. The PAC/MoO2/Mo2C ternary composites highlight promising Mo-based electrode materials suitable for high-performance energy storage. Explicitly, this work also demonstrates a simple and sustainable approach to enhance the electrochemical performance of porous carbon materials.

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Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites

et al. 2021

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“…4,5 However, one of the key challenges limiting practical and commercial aqueous-based supercapacitors is a corrosion issue of metal current collectors in aqueousbased electrolytes. Recently, the surface modi cation of metals with carbon materials (i.e., graphite, 6,7 graphene, 8,9 and carbon nanotubes 10 ) has attracted great attention for many other applications. Such reports highlighted remark improvements of the modi ed electrodes including the suppression of corrosion, 8 the improvement of interfacial contact, 9 and the reduction of internal resistance.…”

Section: Main Textmentioning

confidence: 99%

First Scalable 18650 Aqueous-based Supercapacitors Using Hydrophobicity of Anti-corrosion Graphite Passivation Layer

Chomkhuntod

Iamprasertkun

2020

Preprint

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Scalable 18650 aqueous-based supercapacitors are ideal as future energy storage technology due to their great safety, low cost, and environmental friendliness as well as high power density. Until now, there are no commercial aqueous-based supercapacitors due to the corrosion of metal current collectors. In this work, we have introduced a new concept using hydrophobicity of anti-corrosion graphite passivation layer coated on Al foil with high surface roughness leading to the lotus effect.

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“…Recently, the surface modifications of metal current collectors with carbon-based materials (i.e., graphite 11 , 12 , graphene 13 , 14 , and carbon nanotubes 15 ) have attracted great attention to improve the physical properties and electrochemical performance of the modified electrodes for various energy storage systems. Those publications show remarkable improvements of the modified electrodes including suppression of corrosion 13 , improvement of interfacial contact 14 , and reduction of internal resistance 16 .…”

Section: Introductionmentioning

confidence: 99%

Scalable 18,650 aqueous-based supercapacitors using hydrophobicity concept of anti-corrosion graphite passivation layer

Chomkhuntod

Iamprasertkun

Chiochan

et al. 2021

Sci Rep

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Scalable aqueous-based supercapacitors are ideal as future energy storage technologies due to their great safety, low cost, and environmental friendliness. However, the corrosion of metal current collectors e.g., aluminium (Al) foil in aqueous solutions limits their practical applications. In this work, we demonstrate a low-cost, scalable, and simple method to prepare an anti-corrosion current collector using a concept of hydrophobicity by coating the hydrophobic graphite passivation layer on the Al foil via a roll-to-roll coating technology at the semi-automation scale of production pilot plant of 18,650 cylindrical supercapacitor cells. All qualities of materials, electrodes, and production process are therefore in the quality control as the same level of commercial supercapacitors. In addition, the effects of the graphite coating layer have been fundamentally evaluated. We have found that the graphite-coated layer can improve the interfacial contact without air void space between the activated carbon active material layer and the Al foil current collector. Importantly, it can suppress the corrosion and the formation of resistive oxide film resulting in better rate capability and excellent cycling stability without capacitance loss after long cycling. The scalable supercapacitor prototypes here in this work may pave the way to practical 18,650 supercapacitors for sustainable energy storage systems in the future.

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Current collectors for low resistance aqueous flexible printed supercapacitors

Cited by 45 publications

References 17 publications

Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites

Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites

First Scalable 18650 Aqueous-based Supercapacitors Using Hydrophobicity of Anti-corrosion Graphite Passivation Layer

Scalable 18,650 aqueous-based supercapacitors using hydrophobicity concept of anti-corrosion graphite passivation layer

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