Title: | Lithium titanate/pyrenecarboxylic acid decorated carbon nanotubes hybrid - Alginate gel supercapacitor | Authors: | Ojha, Manoranjan Le Houx, James Mukkabla, Radha Kramer, Denis Wills, Richard George Andrew Deepa, Melepurath |
Language: | eng | Keywords: | Capacitance;Carbon nanotubes;Energy density;Lithium titanate;Supercapacitor | Issue Date: | 20-Jun-2019 | Publisher: | Elsevier | Document Type: | Article | Journal / Series / Working Paper (HSU): | Electrochimica Acta | Volume: | 309 | Issue: | 20 June 2019 | Page Start: | 253 | Page End: | 263 | Publisher Place: | New York, NY [u.a.] | Abstract: | A facile scalable strategy is reported for the synthesis of a hybrid of lithium titanate (Li 4 Ti 5 O 12 or LTO)and 1-pyrenecarboxylic acid decorated multiwalled carbon nanotubes (PCA@CNTs). LTO platelets comprising of quasi-spherical nanoparticles afford short diffusion paths for electrolyte ions. PCA@CNTs, enhance the electrical conductivity of the nearly insulating LTO by 3 orders of magnitude, thus maximizing the ion-uptake capability of the hybrid. Symmetric and asymmetric supercapacitors with the LTO/PCA@CNTs hybrid supported over Ni foam substrates are assembled with a novel Li + conducting alginate gel, in air without any inert conditions that are typically used for all LTO based devices. The gel shows an average ionic conductivity of ∼8.4 mS cm −1 at room temperature, and is found to be electrochemically stable over a wide operational voltage window of ∼2.5 V. Benefitting from the synergy of electrical double layer (EDL)storage afforded by PCA@CNTs, ion-storage by LTO through a redox reaction and EDL, and the ease ion-movement across the cell due to the open architecture of CNTs, the asymmetric LTO/PCA@CNTs hybrid cell outperforms the symmetric cells by a large margin. The best areal specific capacitance (SC), volumetric SC and energy density are ∼54 mF cm −2 , ∼4.3 F cm −3 (at 0.5 mA cm −2 )and ∼3.7 mWh cm −3 (at a power density of 49.6 mW cm −3 )significantly enhanced for the asymmetric LTO/PCA@CNTs hybrid cell, compared to the symmetric- PCA@CNTs and hybrid cells. The design is simple to implement and can serve as a prototype to develop a range of yet unexplored LTO/carbon nanomaterial based supercapacitors. |
Organization Units (connected with the publication): | Energy Technology Research Group, Faculty of Engineering and Physical Sciences, University of Southampton, United Kingdom | ISSN: | 0013-4686 | Verlags-DOI: | 10.1016/j.electacta.2019.03.211 |
Appears in Collections: | 6 - Publication references (without fulltext) of your publications before HSU |
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