Journal ArticleDOI
Vanadium Oxide Nanowire–Carbon Nanotube Binder‐Free Flexible Electrodes for Supercapacitors
Sanjaya D. Perera,Bijal B. Patel,Nour Nijem,Katy Roodenko,Oliver Seitz,John P. Ferraris,Yves J. Chabal,Kenneth J. Balkus +7 more
TLDR
In this paper, the authors developed a simple method for preparing freestanding carbon nanotube (CNT)-V2O5 nanowire (VNW) composite paper electrodes without using binders.Abstract:
Vanadium pentoxide (V2O5) layered nanostructures are known to have very stable crystal structures and high faradaic activity. The low electronic conductivity of V2O5 greatly limits the application of vanadium oxide as electrode materials and requires combining with conducting materials using binders. It is well known that the organic binders can degrade the overall performance of electrode materials and need carefully controlled compositions. In this study, we develop a simple method for preparing freestanding carbon nanotube (CNT)-V2O5 nanowire (VNW) composite paper electrodes without using binders. Coin cell type (CR2032) supercapacitors are assembled using the nanocomposite paper electrode as the anode and high surface area carbon fiber electrode (Spectracarb 2225) as the cathode. The supercapacitor with CNT-VNW composite paper electrode exhibits a power density of 5.26 kW Kg−1 and an energy density of 46.3 Wh Kg−1. (Li)VNWs and CNT composite paper electrodes can be fabricated in similar manner and show improved overall performance with a power density of 8.32 kW Kg−1 and an energy density of 65.9 Wh Kg−1. The power and energy density values suggest that such flexible hybrid nanocomposite paper electrodes may be useful for high performance electrochemical supercapacitors.read more
Citations
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Journal ArticleDOI
Large-Scale Self-Assembly of 3D Flower-like Hierarchical Ni/Co-LDHs Microspheres for High-Performance Flexible Asymmetric Supercapacitors.
TL;DR: A facile and inexpensive and self-assembled strategy to massively fabricate Ni/Co layered double hydroxides (LDHs) with special three-dimensional hierarchical microsphere structure with well-defined flower-like configuration is developed under mild reaction conditions.
Journal ArticleDOI
Ultrathin V2O5 nanosheet cathodes: realizing ultrafast reversible lithium storage
Xianhong Rui,Ziyang Lu,Hong Yu,Dan Yang,Huey Hoon Hng,Tuti Mariana Lim,Tuti Mariana Lim,Qingyu Yan +7 more
TL;DR: Few-layer V(2)O(5) nanosheets with a thickness of 2.1-3.8 nm have been successfully synthesized in this work via a simple and scalable liquid exfoliation technique, resulting in Li-ion cathodes with remarkable energy and power densities.
Journal ArticleDOI
Flexible planar/fiber-architectured supercapacitors for wearable energy storage
TL;DR: In this article, the authors focus on recent advances in flexible supercapacitors including planar-structured flexible SCs and the new-type fiber SCs as well as fiber integrated/hybrid energy systems containing fiber SC.
Journal ArticleDOI
Cucumber-Like V2O5/poly(3,4-ethylenedioxythiophene)&MnO2 Nanowires with Enhanced Electrochemical Cyclability
TL;DR: This heterostructured nanomaterial with PEDOT as the shell and MnO(2) nanoparticles as the protuberance exhibits enhanced electrochemical cycling performance and stability of nanowire electrodes especially at low rate for application in rechargeable lithium batteries.
Journal ArticleDOI
Valence-Optimized Vanadium Oxide Supercapacitor Electrodes Exhibit Ultrahigh Capacitance and Super-Long Cyclic Durability of 100 000 Cycles
Minghao Yu,Minghao Yu,Yan Zeng,Yi Han,Xinyu Cheng,Wenxia Zhao,Chaolun Liang,Yexiang Tong,Haolin Tang,Xihong Lu +9 more
TL;DR: In this paper, an innovative and effective method is reported to significantly boost the durability and capacitance of VOx through tuning the valence state of vanadium, which is optimized through a very facile electrochemical oxidation method.
References
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Journal ArticleDOI
Materials for electrochemical capacitors
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TL;DR: In-situ high-resolution transmission electron microscopy (HRTEM) studies of the structural transformations that occur during the synthesis of carbon-coated LiFePO4 and heat treatment to elevated temperatures were conducted in two different electron microscopes as discussed by the authors.
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Anchoring Hydrous RuO2 on Graphene Sheets for High-Performance Electrochemical Capacitors
TL;DR: In this paper, the authors demonstrate the importance and great potential of graphene-based composites in the development of high-performance energy-storage systems and demonstrate that the combined advantages of GSs and RuO 2 in such a unique structure are that the ROGSC-based supercapacitors exhibit high specifi c capacitance ( ∼ 570 F g − 1 for 38.3 wt% Ru loading), enhanced rate capability, excellent electrochemical stability ( ∼ 97.9% retention after 1000 cycles), and high energy density (20.1 Wh kg − 1 )
Journal ArticleDOI
R&D considerations for the performance and application of electrochemical capacitors
TL;DR: In this article, the development of lower cost carbons appropriate for use in electrochemical capacitors is underway by several speciality carbon suppliers. The goal is to reduce the cost of the carbon to $10-15/kg.