Nest-like V3O7 self-assembled by porous nanowires as an anode supercapacitor material and its performance optimization through bonding with N-doped carbon
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Vanadium oxides (such as V2O5, V2O3 and VO2) hold great promise as electrode materials for energy storage due to their high electrochemical activity, low cost and environmental benignity.Keywords:
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光的吸收的理解是必要的为有效光电并且有 IIIV nanowire 数组的 photodetection 应用。这里，我们相关有当模特儿的实验并且试验性地为改变 nanowire 直径和长度在 InP nanowire 数组验证光的预言的吸收。我们发现那在 400 nm 的程度中的长 nanowires 能吸收的 2,000 nm 有在乐队上面的精力的 94% 事件光豁开并且作为后果，点亮在简单光线光学，描述哪个将在 nanowires 之间旅行能被 nanowires 高效地吸收。当光从进数组最高区域的空气被联合时，我们的大小证明为长 nanowires 的吸收由插入思考损失是有限的。这些思考损失能被最近把一条更小的直径介绍给 nanowire 部分到空气减少最高区域。为有如此的 nanowire 形态学调整的 nanowire 数组，我们发现吸收比与增加 nanowire 的其余部分的直径单调地增加。
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Carbon-based nanocomposites were synthesized for high-performance supercapacitors. The coalition between each of the constituent in the nanocomposites and the performance was investigated. Continuous efforts have been put to improve the supercapacitor assembly techniques from conventional supercapacitor to all-solid-state supercapacitor and to binder-free supercapacitor.
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This chapter contains sections titled: Introduction to Supercapacitors (Current Technology State and Literature Review) Main Types and Structures of Supercapacitors Physical/Electrochemical Processes in Supercapacitors Supercapacitor Components Assembly and Manufacturing of Supercapacitors Supercapacitors Stacking and Systems Supercapacitor Performance, Testing, and Diagnosis Supercapacitor Configurations Applications Challenges and Perspectives of Electrochemical Supercapacitors References
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Power density
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Abstract Three‐dimensional MnO 2 nanorods were synthesized on a carbon cloth (CC) via hydrothermal method to fabricate binder‐free electrode for flexible supercapacitor application. The fabricated MnO 2 /CC electrode exhibits specific capacitance of 487 F g −1 at current density of 2 A g −1 in conventional three electrode system using 1 M Na 2 SO 4 electrolyte. Furthermore, a flexible symmetric supercapacitor is assembled using 1 M Na 2 SO 4 electrolyte which shows maximum specific capacitance of 232 F g −1 at current density of 0.5 A g −1 . The supercapacitor exhibits specific energy up to 5.18 Wh kg −1 and specific power of 242 W kg −1 at 0.5 and 1.0 A g −1 , respectively. Furthermore, the supercapacitor exhibits specific capacitance retention of 91.7% over 1000 charging discharging cycles. The attractive performance suggests that MnO 2 /CC supercapacitor has potential application for energy storage.
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Abstract Charging times ranging from seconds to minutes with high power densities can be achieved by electrochemical capacitors in principle. Over the past few decades, the performance of supercapacitors has been greatly improved by the utilization of new materials, preparation of unique nanostructures, investigation of electrolytes, and so on. However, the discovery of the related basic theory is very limited. Herein, a new view of a supercapacitor called the “integrated supercapacitor” is proposed. The electrode of the integrated supercapacitor consists of certain positive and negative materials. With this design, a single integrated electrode can work in both the positive and negative potential windows simultaneously. Additionally, the integrated full supercapacitor device shows a much higher capacitance and wider potential window than traditional single symmetric and asymmetric supercapacitors, which results from its multiple mechanisms, including the traditional positive//positive symmetric, positive//negative asymmetric, and negative//negative symmetric full supercapacitor mechanisms.
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Supercapacitors have shown great potential as important complements to batteries. We first describe the principle of supercapacitors, including the categories and the main components of supercapacitors. In the second part, we compare the advantages of supercapacitors with other energy storage devices, and then the power densities of active materials are compared with each other. In the third part, we show how various technologies are used to fabricate electrodes and supercapacitors. In the last part, several applications are presented, showing the high value of supercapacitors, including hybrid vehicles, solar cells, and wearable and portable devices.
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