YbCl3 electrode in alkaline aqueous electrolyte with high pseudocapacitance

Chen, Kunfeng; Xue, Dongfeng

doi:10.1016/j.jcis.2014.03.022

Cited by 42 publications

(20 citation statements)

References 21 publications

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“…Active colloidal electrode displays high capacitance. As shown in Table 1, the specific capacitance of the colloid electrode is higher than their theoretical one-electron value [85][86][87][88][89][90][91][92][93]. Because of the confined effect between colloids, carbon and binder, highly active redox cations and a large number of active centers formed in colloidal systems, thus leading to high capacitance.…”

Section: Figure 10mentioning

confidence: 94%

Nanofabrication strategies for advanced electrode materials

Chen

Xue

2017

Nanofabrication

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Advanced energy storage devices, i.e., Li-ion battery, supercapacitor, need high electroactive metal oxide materials with stable structure during charging/ discharging cycling [1][2][3]. However, metal oxide electrode materials often suffer from low conductivity, and slow ion diffusion rate during electrochemical redox reaction. In recent years, lots of efforts are done to design nanostructured materials to enhance their function. When downsizing to nanosize, the electroactive areas of materials are increased and ion/electron diffusion length is shortened, and therefore specific capacitance of active materials is significantly enhanced [4][5][6]. For example, 3D holey-graphene/niobia composite architectures have been designed to show ultrahigh-rate energy storage performance [7]. The highly interconnected graphene network in the 3D architecture shows excellent electron transport properties, while its hierarchical porous structure enables rapid ion transport. Although the nanostructured materials have shown extraordinary promise for electrochemical energy storage, most of the existing synthesis techniques require multistep and laborious procedures [8,9]. The dual pressure of energy needs and environmental requirements in society demand the rapid screening of exceptional performance materials to shorten R&D of advanced energy storage devices. As shown in Figure 1a, R&D of electrode materials mainly includes structure & component design, materials synthesis and performance evaluation. During these processes, materials synthesis often need longer time and complex equipments, which increase the finding time of new electrode materials. The development of easy and fast nanofabrication strategy can accelerate finding rate of new electrode materials in laboratory (Figure 1b). Furthermore, with creative design idea, the material synthesis process can be replaced or fused into one structure-performance process (Figure 1c), which not only accelerate the finding rate of new electrode materials, but also decrease the cost of searching new electrode materials. Abstract: The development of advanced electrode materials for high-performance energy storage devices becomes more and more important for growing demand of portable electronics and electrical vehicles. To speed up this process, rapid screening of exceptional materials among various morphologies, structures and sizes of materials is urgently needed. Benefitting from the advance of nanotechnology, tremendous efforts have been devoted to the development of various nanofabrication strategies for advanced electrode materials. This review focuses on the analysis of novel nanofabrication strategies and progress in the field of fast screening advanced electrode materials. The basic design principles for chemical reaction, crystallization, electrochemical reaction to control the composition and nanostructure of final electrodes are reviewed. Novel fast nanofabrication strategies, such as burning, electrochemical exfoliation, and their basic principles are also summarized. More im...

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Section: Figure 10mentioning

confidence: 94%

Nanofabrication strategies for advanced electrode materials

Chen

Xue

2017

Nanofabrication

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“…Instead, the colloid possesses a lot of active redox cations in quasi‐solid form, which can be easily accessed by electrolyte ions. 6 As shown in Table , various redox cations with different oxidation states have been confirmed to show ultrahigh capacitances, i. e. V 3+ , Mn 2+ , Fe 3+ , Co 2+ , Ni 2+ ,, Cu 2+ , Sn 4+ , Ce 3+ , Yb 3+ and Er 3+ ions. Compared with their theoretical value, redox cations in colloidal ionic electrodes often display multiple‐electron redox reaction.…”

Section: Redox Cations In Colloidal Electrodementioning

confidence: 94%

Colloidal Supercapattery: Redox Ions in Electrode and Electrolyte

Chen

Xue

2017

The Chemical Record

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Redox chemistry is the cornerstone of various electrochemical energy conversion and storage systems, associated with ion diffusion process. To actualize both high energy and power density in energy storage devices, both multiple electron transfer reaction and fast ion diffusion occurred in one electrode material are prerequisite. The existence forms of redox ions can lead to different electrochemical thermodynamic and kinetic properties. Here, we introduce novel colloid system, which includes multiple varying ion forms, multi-interaction and abundant redox active sites. Unlike redox cations in solution and crystal materials, colloid system has specific reactivity-structure relationship. In the colloidal ionic electrode, the occurrence of multiple-electron redox reactions and fast ion diffusion leaded to ultrahigh specific capacitance and fast charge rate. The colloidal ionic supercapattery coupled with redox electrolyte provides a new potential technique for the comprehensive use of redox ions including cations and anions in electrode and electrolyte and a guiding design for the development of next-generation high performance energy storage devices.

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“…2) [31,32]. The principle of colloidal ionic supercapacitor systems has been proven in multiple-valence metal cations of Cu 2+ [33], Fe 3+ [34,35], Co 2+ [28], Ni 2+ [36], Sn 4+ [37], Yb 3+ [38] and Er 3+ [39] ionic systems. In addition, binary A x B 1Àx ionic pseudocapacitor systems involving Mn, Fe, Co, and Ni have also been developed [40].…”

Section: Advantages Of Colloidal Supercapacitor Electrode Materialsmentioning

confidence: 99%