WO<sub>3</sub> nanoflowers with excellent pseudo-capacitive performance and the capacitance contribution analysis

Qiu, Meijia; Sun, Peng; Shen, Liuxue; Wang, Kun; Song, Shuqin; Yu, Xiang; Tan, Shaozao; Zhao, Chuanxi; Mai, Wenjie

doi:10.1039/c6ta00237d

Cited by 154 publications

(81 citation statements)

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“…Qiu et al. illustrated the synthesis of nanoflower‐like WO 3 on Ti foil through an electrodeposition method and obtained an excellent electrochemical performance (Figure a) . The Ti foil acted as an efficient substrate and scaffold for the deposition of WO 3 nanoflowers.…”

Section: Current Advances In Wo3‐based Scsmentioning

confidence: 99%

“…Furthermore, Qiu et al. fabricated an ASC by employing WO 3 nanoflowers as the negative electrode and TiO 2 @C@Ppy as the positive electrode . The as‐obtained ASC device exhibited a high energy density of 0.53 mWh cm −3 and power density of 229.3 mW cm −3 .…”

Section: Current Advances In Wo3‐based Scsmentioning

confidence: 99%

“…Qiu et al illustrated the synthesis of nanoflower-like WO 3 on Ti foil through an electrodepositionm ethod and obtained ane xcellent electrochemical performance ( Figure 6a). [80] The Ti foil acted as an efficient substrate and scaffold for the deposition of WO 3 nanoflowers.T he WO 3 nanoflowers were prepared at variousd eposition times (1-8 min) at af ixed potential of À2.5 V. The as-prepared WO 3 nanoflowers demonstrateda na real specific capacitance of 658 mF cm À2 and a gravimetric specific capacitance of 196 Fg À1 at as can rate of 10 mV s À1 (Figure 6e)S hinde et al demonstrated the synthesis of WO 3 thin films through the successive ionic layer adsorption and reaction (SILAR)m ethod. [81] In the SILAR method, film development takes place through an ion-by-ion growth process.…”

Section: Current Advances In Wo 3 -Based Scsmentioning

confidence: 99%

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Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Shinde

2019

ChemSusChem

127

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Current progress in the advancement of energy‐storage devices is the most important factor that will allow the scientific community to develop resources to meet the global energy demands of the 21st century. Nanostructured materials can be used as effective electrodes for energy‐storage devices because they offer various promising features, including high surface‐to‐volume ratios, exceptional charge‐transport features, and good physicochemical properties. Until now, the successful research frontrunners have focused on the preparation of positive electrode materials for energy‐storage applications; nevertheless, the electrochemical performance of negative electrodes is less frequently reported. This review mainly focuses on the current progress in the development of tungsten oxide‐based electrodes for energy‐storage applications, primarily supercapacitors (SCs) and batteries. Tungsten is found in various stoichiometric and nonstoichiometric oxides. Among the different tungsten oxide materials, tungsten trioxide (WO3) has been intensively investigated as an electrode material for different applications because of its excellent charge‐transport features, unique physicochemical properties, and good resistance to corrosion. Various WO3 composites, such as WO3/carbon, WO3/polymers, WO3/metal oxides, and tungsten‐based binary metal oxides, have been used for application in SCs and batteries. However, pristine WO3 suffers from a relatively low specific surface area and low energy density. Therefore, it is crucial to thoroughly summarize recent progress in utilizing WO3‐based materials from various perspectives to enhance their performance. Herein, the potential‐ and pH‐dependent behavior of tungsten in aqueous media is discussed. Recent progress in the advancement of nanostructured WO3 and tungsten oxide‐based composites, along with related charge‐storage mechanisms and their electrochemical performances in SCs and batteries, is systematically summarized. Finally, remarks are made on future research challenges and the prospect of using tungsten oxide‐based materials to further upgrade energy‐storage devices.

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Section: Current Advances In Wo3‐based Scsmentioning

confidence: 99%

Section: Current Advances In Wo3‐based Scsmentioning

confidence: 99%

Section: Current Advances In Wo 3 -Based Scsmentioning

confidence: 99%

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Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Shinde

2019

ChemSusChem

127

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“…In mono‐electrochrome (i.e., with a single active EC layer) ECD configurations, an ion‐conducting SPE is sandwiched between two transparent conducting oxide coated glass, one of which is laminated with the functional coating. The working mechanism of the ECDs resembles a thin film electrochemical cell, prompting contemporary EC researchers to explore the possibility of integrating ECDs with other electrochemical energy storage devices such as batteries, supercapacitors, and pseudocapacitors . Yang et al published an excellent review that outlines potential impact areas of these efforts.…”

Section: Introductionmentioning

confidence: 99%

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ganesh

Deb

2017

Adv Materials Inter

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challenging mainly because of their lower ionic conductivity and high relaxation period. In mono-electrochrome (i.e., with a single active EC layer) ECD configurations, an ion-conducting SPE is sandwiched between two transparent conducting oxide coated glass, one of which is laminated with the functional coating. The working mechanism of the ECDs resembles a thin film electrochemical cell, prompting contemporary EC researchers to explore the possibility of integrating ECDs with other electrochemical energy storage devices such as batteries, [2,3] supercapacitors, [4][5][6] and pseudocapacitors. [7,8] Yang et al. [9] published an excellent review that outlines potential impact areas of these efforts. Tian et al. [10] reported the manufacturing of a W 18 O 49 /polyaniline (PANI) based energy level indicating smart supercapacitor electrode that displayed continuous color variations as a response to changing levels of stored energy. Very recently, an ultrafast-charging, high-capacity Al-tungsten oxide based electrochromic battery has been demonstrated by Zhao et al. [11] that showed a sevenfold enhancement in the discharge capacity compared to the other reported works.One substantial challenge in integrating these technologies resides in their mismatched operational requirements. Abruña et al. [12] critically described these differences by noting that the electrolytes are typically the weak-links as many electrochemical systems often push the thermodynamic stability limit for the electrolytes. Additionally, while the ECDs and batteries are designed specifically for a longer storage life, the capacitive charge storage devices require very high cycling efficiency. In a review article, Yang et al. [9] described the challenges in fabricating electrochromic energy system for simultaneous realization of electrochromism and energy storage. They pointed out that high quality ECDs are required to produce a faster and higher response in the optical density against a low charge density. However, batteries or supercapacitors must show a high charge density that significantly compromises the performance of an integrated device. In one section of their review article, Varzi et al. [13] highlighted the challenges associated with charge and mass transport in the Li + containing solid polymer electrolytes for batteries. The discussion is relevant for constructing ECDs as well for Li + ion based systems that offer more stability than an acidic system. A comprehensive list of dissimilarities in operational requirements between the ECD There are ongoing efforts to integrate electrochromic device (ECD) technology with other electrochemical systems. ECDs made with safer "solid" polymer electrolytes (SPEs) are prone to performance degradations due to their high relaxation period that is detrimental to highly dynamic switching operations. Here, the fabrication of partially crystalline WO 3 based all-solid-state mono-electrochrome switches is reported that shows outstanding optical and electrical stability under prolonged charge-discharge cy...

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“…Electrochromic (EC) materials have wide range applications as light modulators, [1][2][3] display devices, [4,5] smart windows, [6,7] etc. [11,[14][15][16] V 2 O 5 with concomitant higher capacitance retention and EC property for future commercial applications. Herein, we fabricated bifunctional electrodes with MnO 2 encrustation onto V 2 O 5 nanowire mat thin films that can serve as stable EESDs. [8][9][10][11][12][13] Therefore, many recent research efforts in this topic are directed toward combining these functionalities that led to the development of electrochromic energy storage devices (EESDs).…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Thin Manganese Dioxide‐Encrusted Vanadium Pentoxide Nanowire Mats for Electrochromic Energy Storage Applications

Surendren

Aparna

Deb

2019

Adv Materials Inter

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is relatively inexpensive and eco-friendly material that exhibits outstanding theoretical capacitance values with a distinct electro-polychromism. [17] However, studies exploiting their concurrent electropolychromism and energy-storing performance in devices are still aberrant. The main hindrance in V 2 O 5 electrode usage for potential commercial applications is their electrochemical instability, write-erase stability, and trapping-related degradations. [18] Constructing the thin film-based EESD electrodes needs a critical selection of components. In principle, the components should offer synergistic enhancements in the charge capacitance and also produce obvious color change during the charge insertion/extraction. Such bifunctionality could be used for either online charge level monitoring or in the energy storing smart window applications. Moreover, the electrochemical stability of transparent conductors must not be compromised by the adopted process as explained by the work of Cai et al. [19] Typically, researchers employ techniques like nanostructuring [20] or binary [21] /ternary [22] hybridizations of materials as effective ways to improve the capacitance of TMOs. The synergistic effect of a thin layer of TMOs on V 2 O 5 nanostructure in enhancing the capacitance and cyclic stability is described in some recent publications. [23,24] These reports highlighted the modifications in the electronic structure and chemical environment of V 2 O 5 that led to the electrode performance enhancements.Research on V 2 O 5 -based EESDs is still in its infancy with only a few reports appeared in the literature. An EC supercapacitor with V 2 O 5 in gyroid nanostructure is reported by Wei et al. [25] They observed a reduction in the initial specific capacitance to half of the value within the first few cycles before stabilization to a constant value of 155 F g −1 . This behavior was attributed to the structural instability of the gyroid nanostructure, which points to the fact that the capacitance retention is a serious issue even in a controlled nanostructuring of V 2 O 5 . In another paper, carbon nanosphere-decorated V 2 O 5 hybrid nanobelts were synthesized, and the effect of annealing on the capacitance and EC property was studied. [8] In the study, the film with higher capacitance is having a relatively slow response time. More attempts are required for the matured development/understanding of better V 2 O 5 based electrode materials V 2 O 5 electrochromic (EC) coatings are attractive for various photonic applications owing to their multiple oxidation states discernable by distinct colors. The material also shows massive potential for electrochemical energy storage because of their layered structure and high theoretical capacitance. Here, the solution processing of the electrodes composed of an ultra-thin layer of MnO 2 -encrusted V 2 O 5 (V 2 O 5 /MnO 2 ) nanowire mats on fluorinated tin oxide substrates is reported that offer much enhanced electrochemical stability along with a superior energy storage performance com...

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WO₃ nanoflowers with excellent pseudo-capacitive performance and the capacitance contribution analysis

Abstract: WO3 nanoflower based negative electrodes demonstrate excellent balance between areal and gravimetric specific capacitances.

Cited by 154 publications

References 42 publications

Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ultra‐Thin Manganese Dioxide‐Encrusted Vanadium Pentoxide Nanowire Mats for Electrochromic Energy Storage Applications

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WO3 nanoflowers with excellent pseudo-capacitive performance and the capacitance contribution analysis

Abstract: WO3 nanoflower based negative electrodes demonstrate excellent balance between areal and gravimetric specific capacitances.

Cited by 154 publications

References 42 publications

Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ultra‐Thin Manganese Dioxide‐Encrusted Vanadium Pentoxide Nanowire Mats for Electrochromic Energy Storage Applications

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WO₃ nanoflowers with excellent pseudo-capacitive performance and the capacitance contribution analysis