A binder-free multi-walled carbon nanotube electrode containing oxygen functionalities for electrochemical capacitors

McArthur, Mark A.; Hordy, Nathan; Coulombe, Sylvain; Omanovic, Sasha

doi:10.1016/j.electacta.2014.09.019

Cited by 14 publications

(25 citation statements)

References 51 publications

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“…MWCNTs were grown using a modified t‐CVD method initially put forward by Baddour et al and optimized by Hordy et al The details of the modified t‐CVD procedure can be found elsewhere . Briefly, grade 316 SS mesh squares (400 series, 25 µm grid bar, 1.8 cm × 1.8 cm; McMaster‐Carr, USA), serving as combined support/catalyst/current collector for MWCNTs, were ultrasonically cleaned in acetone for 20 min and placed in a quartz furnace tube (55 mm i.d.).…”

Section: Methodsmentioning

confidence: 99%

“…The MWCNT electrodes were plasma functionalized (f‐MWCNTs) following the procedure described in McArthur et al using a low‐pressure capacitively‐coupled radio‐frequency (RF) glow discharge. After evacuation of the plasma chamber to its base pressure (ca.…”

Section: Methodsmentioning

confidence: 99%

“…The 1.8 cm × 1.8 cm square MMO/f‐MWCNT electrodes were punched into discs (1.6 cm dia.) and placed in a vertical PTFE electrode holder (flat specimen holder, Princeton Applied Research, USA) described in McArthur et al Of the available 1.979 cm 2 area, only 0.795 cm 2 was exposed to the electrolyte. In order to maintain an oxygen‐free electrolyte, argon (99.998 % pure) was bubbled through the cell prior to electrochemical measurements initially for 30 min and then continuously during the measurements.…”

Section: Methodsmentioning

confidence: 99%

“…Pseudocapacitance arises whenever a reversible redox reaction occurs on the surface or in the bulk of the electrode and charge transfer occurs (e.g. oxygen functionalities, transition metal oxides, high surface area conducting polymers). Several attempts have been made to combine the inherently fast kinetics of (i) with the large specific capacitance of (ii) …”

Section: Introductionmentioning

confidence: 99%

“…In the present work, we report an initial study at the bench‐scale on the suitability of a binder‐free hybrid three‐dimensional (3D) electrode combining the benefits of high‐area plasma functionalized multi‐walled carbon nanotubes (f‐MWCNTs) with anhydrous MMO coatings of Ir‐ and Ru‐oxides in an alkaline environment for SCs. The functionalization method presented herein yields the possibility to increase the capacitance of MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

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A binder‐free Ir_0.4Ru_0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors

et al. 2017

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An initial study on a simple and inexpensive method to form an Ir 0.4 Ru 0.6 -oxide (MMO) coating onto high-area plasma functionalized multi-walled carbon nanotubes (f-MWCNTs) at the bench-scale for possible supercapacitor (SC) applications is presented. f-MWCNT electrodes are prepared in a two-step process combining the growth of MWCNTs directly onto a 316 stainless steel mesh by thermal-chemical vapour deposition (t-CVD), followed by the addition of oxygen-containing functionalities to their surface by plasma functionalization. The plasma functionalization step is done to: (i) improve electrode wettability and (ii) improve capacitive properties through the addition of pseudocapacitive oxygen functionalities. A simple dip-dry method is then employed to coat the f-MWCNTs with the desired MMO coating (Ir 0.4 Ru 0.6 -oxide) prepared initially in a liquid precursor mixture. f-MWCNT electrodes are suspended and dipped into the precursor then heated in air to evaporate the solvent while building the oxide layer. The resulting MMO/f-MWCNT electrode exhibits excellent stability in 4 mol/L KOH electrolyte, yielding larger specific capacitance values than those obtained on bare f-MWCNT electrodes; at a charging/discharging current density of 0.5 mA cm À2, the MMO/f-MWCNT and f-MWCNT electrodes achieve specific capacitances of 664 AE 7 and 190 AE 30 F g À1 in a 3-electrode cell, respectively. The MMO/f-MWCNT electrodes show good rate capability performance up to 10 mA Á cm À2 and excellent stability.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A binder‐free Ir_0.4Ru_0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors

et al. 2017

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Highly Efficient Materials Assembly Via Electrophoretic Deposition for Electrochemical Energy Conversion and Storage Devices

Wen

Zhang

et al. 2016

Advanced Energy Materials

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and fi lms can be assembled on substrates with this versatile method. Film thickness, particle size and inter structure of EPD fi lms are controllable by adjusting the suspension/process parameters. [ 2,3 ] Energy conversion and storage devices have been developed rapidly in the past few decades, and proposed as the foundation of modern society. Novel carbon materials such as graphene and carbon nanotubes (CNTs) are investigated widely for high-effi ciency rechargeable battery and supercapacitor (SC) applications. [ 4,5 ] Traditional methods such as blade coating and slot die are employed to prepare electrodes to realize such applications. [ 6,7 ] In these methods, active materials are dissolved into a solvent to form a viscous solution, and a fi lm is obtained after coating and solvent evaporation. Nevertheless, neither thickness control nor a high fi lm assembly effi ciency can be realized via these methods. In addition, traditional methods exhibit limitation on the fabrication of nanostructured energy materials due to the aggregation of nanoparticles. On the other hand, methods for micro-batteries such as vapor deposition methods, [ 8 ] radio-frequency sputtering, [ 9 ] and pulsed laser deposition [ 10,11 ] are expensive and diffi cult to scale up. Indeed, a versatile EPD technique with cost-effectiveness, short formation time, and high scalability is promising for efficient fabrication of energy conversion and storage materials and devices. A typical EPD process is performed in two steps, including the dispersion of powder particles in a solvent to form a stable suspension and the deposition of particles on a substrate in the presence of an electric fi eld. [ 12,13 ] Preparation of a stable suspension is essential to the deposition process. The stability of suspension, adjustable with surfactants, is correlated with electrostatic repulsive and van der Waals attractive interactions. The stability of suspension/colloid is characterized by zeta potential, the value of which represents the magnitude of repulsive interaction while the sign represents the migration direction of particles. Zeta potential is mainly determined by temperature, pH, and type of surfactant. On the other hand, the migration velocity of particles in deposition depends on the applied voltage/current, particle size, zeta potential, suspension concentration, and solvent viscosity. [ 14 ] The utilization of EPD in the energy storage/conversion devices fi eld enables the direct deposition of active particles on the current collector.Featuring pronounced controllability, versatility, and scalability, electrophoretic deposition (EPD) has been proposed as an effi cient method for fi lm assembly and electrode/solid electrolyte fabrication in various energy storage/conversion devices including rechargeable batteries, supercapacitors, and fuel cells. High-quality electrodes and solid electrolytes have been prepared through EPD and exhibit advantageous performances in comparison with those realized with traditional methods. Recent advances in the appli...

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Direct electrochemical regeneration of enzymatic cofactor 1,4‐NADH on a cathode composed of multi‐walled carbon nanotubes decorated with nickel nanoparticles

et al. 2017

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Multi‐walled carbon nanotubes (MWCNTs) were grown on a stainless steel mesh and decorated with nickel nanoparticles (Ni NPs). The developed Ni NP‐MWCNT material was then used as a cathode in an electrochemical batch reactor to electrocatalytically convert NAD+ to enzymatically‐active 1,4‐NADH. The regeneration of 1,4‐NADH was studied at various electrode potentials. At electrode potential of −1.6 V, a very high recovery (relative amount of 1,4‐NADH in the product mixture) was obtained, 98 ± 1 %. In comparison, to achieve the same recovery on a non‐decorated MWCNT cathode, a much higher cathodic potential was needed (−2.3 V), establishing the importance of Ni NPs on the electrocatalytic activity in reducing NAD+ to 1,4‐NADH. It was postulated that hydrogen adsorbs on Ni NPs immobilized on MWCNTs to form Ni‐Hads, and this activated hydrogen rapidly reacts with neighbouring NAD‐radicals, preventing the dimerization of the latter species, ultimately yielding 1,4‐NADH.

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A binder-free multi-walled carbon nanotube electrode containing oxygen functionalities for electrochemical capacitors

Cited by 14 publications

References 51 publications

A binder‐free Ir_0.4Ru_0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors

A binder‐free Ir_0.4Ru_0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors

Highly Efficient Materials Assembly Via Electrophoretic Deposition for Electrochemical Energy Conversion and Storage Devices

Direct electrochemical regeneration of enzymatic cofactor 1,4‐NADH on a cathode composed of multi‐walled carbon nanotubes decorated with nickel nanoparticles

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A binder-free multi-walled carbon nanotube electrode containing oxygen functionalities for electrochemical capacitors

Cited by 14 publications

References 51 publications

A binder‐free Ir0.4Ru0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors

A binder‐free Ir0.4Ru0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors

Highly Efficient Materials Assembly Via Electrophoretic Deposition for Electrochemical Energy Conversion and Storage Devices

Direct electrochemical regeneration of enzymatic cofactor 1,4‐NADH on a cathode composed of multi‐walled carbon nanotubes decorated with nickel nanoparticles

Contact Info

Product

Resources

About

A binder‐free Ir_0.4Ru_0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors

A binder‐free Ir_0.4Ru_0.6‐oxide/functionalized multi‐walled carbon nanotube electrode for possible applications in supercapacitors