Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes

A new pseudocapacitive combination, viz. CoO-MnO2-MnCo2O4 hybrid nanowires (HNWs), is synthesized using a facile single-step hydrothermal process, and its properties are benchmarked with conventional battery-type flower-shaped MnCo2O4 obtained by similar processing. The HNWs showed high electrical c...

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Main Authors: Harilal, M., Krishnan, S.G., Yar, A., Misnon, I.I., Reddy, M.V., Yusoff, M.M., Dennis, J.O., Jose, R.
Format: Article
Published: American Chemical Society 2017
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032893914&doi=10.1021%2facs.jpcc.7b06630&partnerID=40&md5=8673628f1dc7d96d92bee50f25aa0f59
http://eprints.utp.edu.my/19867/
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spelling my.utp.eprints.198672018-04-22T13:11:53Z Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes Harilal, M. Krishnan, S.G. Yar, A. Misnon, I.I. Reddy, M.V. Yusoff, M.M. Dennis, J.O. Jose, R. A new pseudocapacitive combination, viz. CoO-MnO2-MnCo2O4 hybrid nanowires (HNWs), is synthesized using a facile single-step hydrothermal process, and its properties are benchmarked with conventional battery-type flower-shaped MnCo2O4 obtained by similar processing. The HNWs showed high electrical conductivity and specific capacitance (Cs) (1650 F g-1 or 184 mA h g-1 at 1 A g-1) with high capacity retention, whereas MnCo2O4 nanoflower electrode showed only one-third conductivity and one-half of its capacitance (872 F g-1 or 96 mA h g-1 at 1 A g-1) when used as a supercapacitor electrode in 6 M KOH electrolyte. The structure-property relationship of the materials is deeply investigated and reported herein. Using the HNWs as a pseudocapacitive electrode and commercial activated carbon as a supercapacitive electrode we achieved battery-like specific energy (Es) and supercapacitor-like specific power (Ps) in aqueous alkaline asymmetric supercapacitors (ASCs). The HNWs ASCs have shown high Es (90 Wh kg- ) (volumetric energy density Ev 0.52 Wh cm- ) with Ps up to ~104 W kg-1 (volumetric power density Pv 5 W cm-3) in 6 M KOH electrolyte, allowing the device to store an order of magnitude more energy than conventional supercapacitors. © 2017 American Chemical Society. American Chemical Society 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032893914&doi=10.1021%2facs.jpcc.7b06630&partnerID=40&md5=8673628f1dc7d96d92bee50f25aa0f59 Harilal, M. and Krishnan, S.G. and Yar, A. and Misnon, I.I. and Reddy, M.V. and Yusoff, M.M. and Dennis, J.O. and Jose, R. (2017) Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes. Journal of Physical Chemistry C, 121 (39). pp. 21171-21183. http://eprints.utp.edu.my/19867/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description A new pseudocapacitive combination, viz. CoO-MnO2-MnCo2O4 hybrid nanowires (HNWs), is synthesized using a facile single-step hydrothermal process, and its properties are benchmarked with conventional battery-type flower-shaped MnCo2O4 obtained by similar processing. The HNWs showed high electrical conductivity and specific capacitance (Cs) (1650 F g-1 or 184 mA h g-1 at 1 A g-1) with high capacity retention, whereas MnCo2O4 nanoflower electrode showed only one-third conductivity and one-half of its capacitance (872 F g-1 or 96 mA h g-1 at 1 A g-1) when used as a supercapacitor electrode in 6 M KOH electrolyte. The structure-property relationship of the materials is deeply investigated and reported herein. Using the HNWs as a pseudocapacitive electrode and commercial activated carbon as a supercapacitive electrode we achieved battery-like specific energy (Es) and supercapacitor-like specific power (Ps) in aqueous alkaline asymmetric supercapacitors (ASCs). The HNWs ASCs have shown high Es (90 Wh kg- ) (volumetric energy density Ev 0.52 Wh cm- ) with Ps up to ~104 W kg-1 (volumetric power density Pv 5 W cm-3) in 6 M KOH electrolyte, allowing the device to store an order of magnitude more energy than conventional supercapacitors. © 2017 American Chemical Society.
format Article
author Harilal, M.
Krishnan, S.G.
Yar, A.
Misnon, I.I.
Reddy, M.V.
Yusoff, M.M.
Dennis, J.O.
Jose, R.
spellingShingle Harilal, M.
Krishnan, S.G.
Yar, A.
Misnon, I.I.
Reddy, M.V.
Yusoff, M.M.
Dennis, J.O.
Jose, R.
Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes
author_facet Harilal, M.
Krishnan, S.G.
Yar, A.
Misnon, I.I.
Reddy, M.V.
Yusoff, M.M.
Dennis, J.O.
Jose, R.
author_sort Harilal, M.
title Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes
title_short Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes
title_full Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes
title_fullStr Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes
title_full_unstemmed Pseudocapacitive charge storage in single-step-synthesized CoO-MnO2-MnCo2O4 hybrid nanowires in aqueous alkaline electrolytes
title_sort pseudocapacitive charge storage in single-step-synthesized coo-mno2-mnco2o4 hybrid nanowires in aqueous alkaline electrolytes
publisher American Chemical Society
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032893914&doi=10.1021%2facs.jpcc.7b06630&partnerID=40&md5=8673628f1dc7d96d92bee50f25aa0f59
http://eprints.utp.edu.my/19867/
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