Enhanced charge storage by optimization of pore structure in nanocomposite between ordered mesoporous carbon and nanosized WO3−

Zhou, Yuanyuan; Ko, Seunghyun; Lee, Chul Wee; Pyo, Sung Gyu; Kim, Soo-Kil; Yoon, Seung Soo

doi:10.1016/j.jpowsour.2013.04.054

Cited by 41 publications

(11 citation statements)

References 20 publications

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“…4f show remarkable capacitance retain up to 3500 charge-discharge cycles. More precisely, a slight increase in the capacitance was observed that could be ascribed to an increased accessibility/diffusion of ions deep into the nanochannel structure after several cycles, as a consequence of a longer soaking time (similar results can be found in the literature [59,61,65]). The capacitance was observed to increase up to 114% of the initial capacitance in the first 3000 cycles.…”

Section: à3supporting

confidence: 83%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

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Keywords: electrochemical anodization WO 3 nanostructure phosphoric acid supercapacitor energy storage A B S T R A C T Herein we illustrate the functionality as pseudocapacitive material of tungsten trioxide (WO 3 ) nanochannel layers fabricated by electrochemical anodization of W metal in pure hot ortho-phosphoric acid (o-H 3 PO 4 ). These layers are characterized by a defined nanochannel morphology and show remarkable pseudocapacitive behaviour in the negative potential (À0.8-0.5 V) in neutral aqueous electrolyte (1 M Na 2 SO 4 ). The maximum volumetric capacitance of 397 F cm À3 is obtained at 2 A cm À3. The WO 3 nanochannel layers display full capacitance retention (up to 114%) after 3500 charge-discharge cycles performed at 10 A cm À3 . The relatively high capacitance and retention ability are attributed to the high surface area provided by the regular and defined nanochannel morphology. Kinetic analysis of the electrochemical results for the best performing WO 3 structures, i.e., grown by 2 h-long anodization, reveals the occurrence of pseudocapacitance and diffusional controlled processes. Electrochemical impedance spectroscopy measurements show for the same structures a relatively low electrical resistance, which is the plausible cause for the superior electrochemical behaviour compared to the other structures.

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Section: à3supporting

confidence: 83%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

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“…6d shows the capacitance retention for 10,000 charge/discharge cycles at a current density of 3 A/g. For CoWO 4 -amorphous, a gradual capacitance retention increase was observed, probably due to more exposal of CoWO 4 nanoparticles to the electrolyte, which is a common phenomenon in the WOx-based materials for supercapacitors, owing to the gradual evolution of pseudocapacitive sites with the increase of cycles [37]. For CoWO 4 -crystalline, the capacitance retention initially decreases, which may be owing to the structural damage, and then it increases heavily because CoWO 4 nanoparticles are more exposes to the electrolyte and the CoWO 4 crystals suffers amorphization with the increase of cycles (Fig.…”

Section: Electrochemical Behaviorsmentioning

confidence: 99%

CoWO4 nanoparticles prepared by two methods displaying different structures and supercapacitive performances

Xing¹,

Gui²,

Zhang³

et al. 2015

Electrochimica Acta

124

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“…Lei and co‐workers combined carbon‐nanofiber networks and WO 3 nanorod bundles to build high‐performance aqueous asymmetric supercapacitors with a specific capacitance of 254 F g –1 at a current density of 0.5 A –1 . Yoon and co‐workers further reported ordered mesoporous carbon/WO x< 3 nanocomposites exhibiting a high volumetric capacity (125 F cm –3 ) . Lu and co‐workers showed that WO 3 dispersed in a carbon aerogel is an outstanding supercapacitor electrode material, with one order of magnitude improvement in specific capacitance from 54 F g –1 for the WO 3 nanoparticles to 700 F g –1 for the composite .…”

Section: Tungsten Oxides For Electrochemical and Photoelectric Applicmentioning

confidence: 99%

Tungsten Oxides for Photocatalysis, Electrochemistry, and Phototherapy

et al. 2015

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The conversion, storage, and utilization of renewable energy have all become more important than ever before as a response to ever-growing energy and environment concerns. The performance of energy-related technologies strongly relies on the structure and property of the material used. The earth-abundant family of tungsten oxides (WOx ≤3 ) receives considerable attention in photocatalysis, electrochemistry, and phototherapy due to their highly tunable structures and unique physicochemical properties. Great breakthroughs have been made in enhancing the optical absorption, charge separation, redox capability, and electrical conductivity of WOx ≤3 through control of the composition, crystal structure, morphology, and construction of composite structures with other materials, which significantly promotes the efficiency of processes and devices based on this material. Herein, the properties and synthesis of WOx ≤3 family are reviewed, and then their energy-related applications are highlighted, including solar-light-driven water splitting, CO2 reduction, and pollutant removal, electrochromism, supercapacitors, lithium batteries, solar and fuel cells, non-volatile memory devices, gas sensors, and cancer therapy, from the aspect of function-oriented structure design and control.

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Enhanced charge storage by optimization of pore structure in nanocomposite between ordered mesoporous carbon and nanosized WO3−

Cited by 41 publications

References 20 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

CoWO4 nanoparticles prepared by two methods displaying different structures and supercapacitive performances

Tungsten Oxides for Photocatalysis, Electrochemistry, and Phototherapy

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