Silver thin film electrodes for supercapacitor application

Oje, Alex I.; Ogwu, A. A.; Mirzaeian, Mojtaba; Oje, A.M.; Tsendzughul, Nathaniel

doi:10.1016/j.apsusc.2019.05.101

Cited by 30 publications

(13 citation statements)

References 70 publications

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“…The latter, given by Equation (2), can be improved either by introducing new electrode materials with higher charge storage capability through pseudocapacitive charge storage or by controlling and improving the porosity parameters (i.e., S and D) of the electroactive material [10]. Transition metal oxide-based active materials store energy pseudocapacitively and exhibit a higher specific capacitance and consequently a higher energy density when compared with traditional carbon-based electrode materials that store energy in the form of electric double-layer capacitance (EDLC) [10][11][12][13]. However, transition metal oxides suffer from higher equivalent series resistance (ESR) which results in their lower power density [6,14].…”

Section: Introductionmentioning

confidence: 99%

“…However, activated carbon is the most commonly adopted electrode material in commercial applications due to its outstanding properties such as large specific surface area, controlled porosity, high electric conductivity, cost-effectiveness, chemical inertness and ease of process-ability [21]. Carbon-based materials have inferior specific capacitance since the entire capacitance is contributed through physical charge storage with the formation of an electric double layer associated with the porous structure of the active material [13]. Higher specific capacitance can be achieved by introducing functional groups on the surface [22] or within the core of the active material [23] where total capacitance is the sum of EDLC (through the formation of the electric double layer at electrode/electrolyte interface physically) and Faradaic pseudo-capacitance (contributed by heteroatoms capable of storing electric charge through fast and fully reversible Faradaic reactions at the electrode/electrolyte interface accompanied by electronic charge transfer) of carbon [4,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Pseudocapacitive Effect of Carbons Doped with Different Functional Groups as Electrode Materials for Electrochemical Capacitors

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In this study, RF-based un-doped and nitrogen-doped aerogels were produced by polymerisation reaction between resorcinol and formaldehyde with sodium carbonate as catalyst and melamine as the nitrogen source. Carbon/activated carbon aerogels were obtained by carbonisation of the gels under inert atmosphere (Ar) followed by activation of the carbons under CO2 at 800 °C. The BET analysis of the samples showed a more than two-fold increase in the specific Surf. area and pore volume of carbon from 537 to 1333 m2g−1 and 0.242 to 0.671 cm3g−1 respectively after nitrogen doping and activation. SEM and XRD analysis of the samples revealed highly porous amorphous nanostructures with denser inter-particle cross-linked pathways for the activated nitrogen-doped carbon. The X-Ray Photoelectron Spectroscopy (XPS) results confirmed the presence of nitrogen and oxygen heteroatoms on the Surf. and within the carbon matrix where improvement in wettability with the drop in the contact angle from 123° to 80° was witnessed after oxygen and nitrogen doping. A steady drop in the equivalent series (RS) and charge transfer (RCT) resistances was observed by electrochemical measurements after the introduction of nitrogen and oxygen heteroatoms. The highest specific capacitance of 289 Fg−1 with the lowest values of 0.11 Ω and 0.02 Ω for RS and RCT was achieved for nitrogen and oxygen dual-doped activated carbon in line with its improved Surf. chemistry and wettability, and its enhanced conductivity due to denser inter-particle cross-linked pathways.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pseudocapacitive Effect of Carbons Doped with Different Functional Groups as Electrode Materials for Electrochemical Capacitors

et al. 2020

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“…14 For example, Oje et al reported direct deposition of a thin metallic silver (Ag) film as a conductive coating layer of textile fabrics using a radio frequency (RF) sputtering method. 15 Besides, enhanced specific capacitance properties were also observed due to the presence of silver. Each reporting method has its own merits and demerits.…”

Section: Introductionmentioning

confidence: 98%

“…The disadvantages of cotton textiles are mainly due to their more reduced conductivity of the materials. , So far, research efforts have been made to overcome the conductivity problem by making flexible textiles as conductive electrodes through various procedures such as brush coating, electroless plating, silver plating including dipping and drying process . For example, Oje et al reported direct deposition of a thin metallic silver (Ag) film as a conductive coating layer of textile fabrics using a radio frequency (RF) sputtering method . Besides, enhanced specific capacitance properties were also observed due to the presence of silver.…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Conductive Cotton-Based Textile Electrodes Using Silver- and Carbon-Coated Fabrics for Advanced Flexible Supercapacitors

et al. 2020

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Wearable electronics need the execution of electronic functions, especially on a flexible and wearable sheet substrate. In this regard, cotton textiles are widely considered as environmentally friendly and natural fiber materials, including for soft and breathable clothing. Previously, conductive cotton-based textiles were successfully fabricated through different methods, and the surface sheet resistance was found to be <15 Ω, which shows effective electrical conductivity. Nevertheless, they still need to improve mainly because of the poor electrical conductivity. In this work, conductive cotton textile electrodes with superior bending ability are judiciously fabricated by mixing conductive silver (Ag) powder into a textile ink with various carbon sources such as activated carbon (AC), graphene, and carbon nanotubes (CNTs), which can work as flexible supercapacitor electrodes. Among the three different carbon materials, the AC-based conductive cotton electrodes exhibit superior electrochemical performance in alkaline electrolyte (6 M potassium hydroxide (KOH)). The results of cyclic voltammetry (CV) reveal that areal specific capacitances as high as 3288 and 2695 mF/cm 2 were achieved at scan rates of 5 and 10 mV/s, respectively, for the appropriate proportion of 0.3 g of Ag with 0.15 g of AC (0.3 Ag−AC-0.15). It also exhibits excellent cyclic stability with a high capacitance retention of ∼130% for over 10 000 cycles. Moreover, a symmetric flexible supercapacitor device was also successfully fabricated in the lab scale using a poly(vinyl alcohol) (PVA)−KOH gel electrolyte system, demonstrating that noteworthy rate performance and flexibility can be achieved for the advanced flexible energy-storage devices.

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“…Paleo et al developed hybrid solid-state supercapacitors based on the AC and MnO2 coated cotton fabrics using two different solid electrolyte (Nafion and Aquivion) [20]. Oje et al used a radio frequency (RF) sputtering to fabricate silver (Ag) film on textile fabrics [21].…”

Section: Introductionmentioning

confidence: 99%

Screen printed textile electrodes using graphene and carbon nanotubes with silver for flexible supercapacitor applications

et al. 2020

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The eco-friendly conductive cotton textile is promising alternatives for the flexible substrates in wearable devices since the cotton is as an inexpensive natural fabric material and compatible in modern portable electronics with adequate electrical conductivity. In this work, flexible conductive cotton-based electrodes are prepared via a screen-printing method using the carbonaceous nanomaterials such as carbon nanotubes (CNTs) and graphene with an additional component of conductive silver (Ag) powder and textile ink. The prepared conductive cotton electrodes exhibit lower sheet resistance (<10 Ω) along with superior mass loading (20-30 mg.cm-2). On the basis of the performance of cotton electrodes prepared, an all-solid-state flexible supercapacitor device was successfully fabricated which exhibits a high specific areal capacitance of 677.12 mF.cm-2 at 0.0125 mA.cm-2 for a suitable electrode composition (60% of Ag and 40% CNTs) using a PVA-KOH gel electrolyte. The flexible device endures a stable electrochemical performance under severe mechanical deformation using different bending angles (0°, 30°, 45°, 60° and 90°) of the device and possesses excellent cyclic stability with the capacitance retention of ~80% even after 3000 CV cycles.

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Silver thin film electrodes for supercapacitor application

Cited by 30 publications

References 70 publications

Pseudocapacitive Effect of Carbons Doped with Different Functional Groups as Electrode Materials for Electrochemical Capacitors

Pseudocapacitive Effect of Carbons Doped with Different Functional Groups as Electrode Materials for Electrochemical Capacitors

Eco-Friendly Conductive Cotton-Based Textile Electrodes Using Silver- and Carbon-Coated Fabrics for Advanced Flexible Supercapacitors

Screen printed textile electrodes using graphene and carbon nanotubes with silver for flexible supercapacitor applications

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