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Lithium titanate/pyrenecarboxylic acid decorated carbon nanotubes hybrid - Alginate gel supercapacitor

Lithium titanate/pyrenecarboxylic acid decorated carbon nanotubes hybrid - Alginate gel supercapacitor
Lithium titanate/pyrenecarboxylic acid decorated carbon nanotubes hybrid - Alginate gel supercapacitor

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.

Capacitance, Carbon nanotubes, Energy density, Lithium titanate, Supercapacitor
0013-4686
253-263
Ojha, Manoranjan
8a48b040-a8b1-4b44-9025-e29303b0a725
Le Houx, James
c3130024-47fa-44ee-b10e-a4d76877fb9a
Mukkabla, Radha
845bc693-c818-4a08-bd54-381484be4a0f
Kramer, Denis
1faae37a-fab7-4edd-99ee-ae4c30d3cde4
Wills, Richard George Andrew
60b7c98f-eced-4b11-aad9-fd2484e26c2c
Deepa, Melepurath
c6db6a97-565e-4f77-a10b-d2b6f271df0b
Ojha, Manoranjan
8a48b040-a8b1-4b44-9025-e29303b0a725
Le Houx, James
c3130024-47fa-44ee-b10e-a4d76877fb9a
Mukkabla, Radha
845bc693-c818-4a08-bd54-381484be4a0f
Kramer, Denis
1faae37a-fab7-4edd-99ee-ae4c30d3cde4
Wills, Richard George Andrew
60b7c98f-eced-4b11-aad9-fd2484e26c2c
Deepa, Melepurath
c6db6a97-565e-4f77-a10b-d2b6f271df0b

Ojha, Manoranjan, Le Houx, James, Mukkabla, Radha, Kramer, Denis, Wills, Richard George Andrew and Deepa, Melepurath (2019) Lithium titanate/pyrenecarboxylic acid decorated carbon nanotubes hybrid - Alginate gel supercapacitor. Electrochimica Acta, 309, 253-263. (doi:10.1016/j.electacta.2019.03.211).

Record type: Article

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.

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More information

Accepted/In Press date: 30 March 2019
e-pub ahead of print date: 1 April 2019
Published date: 20 June 2019
Keywords: Capacitance, Carbon nanotubes, Energy density, Lithium titanate, Supercapacitor

Identifiers

Local EPrints ID: 432813
URI: http://eprints.soton.ac.uk/id/eprint/432813
ISSN: 0013-4686
PURE UUID: bf4f2521-10ce-4533-b998-3aaab93577b8
ORCID for Richard George Andrew Wills: ORCID iD orcid.org/0000-0002-4805-7589

Catalogue record

Date deposited: 26 Jul 2019 16:30
Last modified: 26 Nov 2021 02:47

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Contributors

Author: Manoranjan Ojha
Author: James Le Houx
Author: Radha Mukkabla
Author: Denis Kramer
Author: Melepurath Deepa

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