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
One-step synthesis of architectural Ni3S2 nanosheet-on-nanorods array for use as high-performance electrodes for supercapacitors
Xunhui Xiong,Xunhui Xiong,Bote Zhao,Dong Ding,Dongchang Chen,Chenghao Yang,Yong Lei,Meilin Liu +7 more
TL;DR: Liu et al. as discussed by the authors used a simple one-step hydrothermal method to fabricate an architecture based on nickel sulfide (Ni3S2) nanosheets and nanorods.
Journal ArticleDOI
Vanadium dioxide-anchored porous carbon nanofibers as a Na+ intercalation pseudocapacitance material for development of flexible and super light electrochemical energy storage systems
Hadi Hosseini,Saeed Shahrokhian +1 more
TL;DR: In this paper, a flexible binder free supercapacitor electrode composed of hierarchical VO2 nanosheet arrays grown on porous carbon nanofibers (VO2@PCNFs) is designed using a simple hydrothermal method followed by annealing treatment.
Journal ArticleDOI
Facile synthesis of amorphous aluminum vanadate hierarchical microspheres for supercapacitors
TL;DR: In this paper, the authors reported the synthesis of amorphous aluminum vanadate hierarchical microspheres via a simple hydrothermal approach with polyvinylpyrrolidone as a surface directing agent.
Journal ArticleDOI
Controlled synthesis of V2O5/MWCNT core/shell hybrid aerogels through a mixed growth and self-assembly methodology for supercapacitors with high capacitance and ultralong cycle life
TL;DR: In this article, Vanadium pentoxide (V2O5)/multiwalled carbon nanotube (MWCNT) core/shell hybrid aerogels with different MWCNT contents are controlled synthesized through a facile mixed growth and self-assembly methodology.
Journal ArticleDOI
Nickel-mediated polyol synthesis of hierarchical V2O5 hollow microspheres with enhanced lithium storage properties
Yanzhen Zheng,Yanzhen Zheng,Haiyang Ding,Evan Uchaker,Xia Tao,Jian-Feng Chen,Qifeng Zhang,Guozhong Cao +7 more
TL;DR: In this article, a facile template-free synthesis of hierarchical V2O5 hollow microspheres has been developed, based on a nickel-mediated polyol process and subsequent calcinations.
References
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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.
Journal ArticleDOI
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.