Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?

Polyoxometalates (POMs) have been shown to work as faradaic additives to activated carbon (AC) in acidic aqueous electrolytes. Yet, their use in organic media allows not only for added capacity but also higher voltage. Here we show that the tetraethylammonium derivative of phosphotungstate [PWO] (PW...

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Autores: Zhu, Jun-Jie|||0000-0002-8024-099X, Benages-Vilau, Raúl|||0000-0003-0875-124X, Gómez-Romero, Pedro|||0000-0002-6208-5340
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:236001
Acceso en línea:https://ddd.uab.cat/record/236001
https://dx.doi.org/urn:doi:10.1016/j.electacta.2020.137007
Access Level:acceso abierto
Palabra clave:Supercapacitor
Polyoxometalate
Organic electrolyte
Hybrid electrode
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spelling Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?Zhu, Jun-Jie|||0000-0002-8024-099XBenages-Vilau, Raúl|||0000-0003-0875-124XGómez-Romero, Pedro|||0000-0002-6208-5340SupercapacitorPolyoxometalateOrganic electrolyteHybrid electrodePolyoxometalates (POMs) have been shown to work as faradaic additives to activated carbon (AC) in acidic aqueous electrolytes. Yet, their use in organic media allows not only for added capacity but also higher voltage. Here we show that the tetraethylammonium derivative of phosphotungstate [PWO] (PW12) can be homogeneously distributed throughout the pores of activated carbon (AC) in organic solvents such as N,N'-dimethylformamide (DMF) and demonstrate the use of this hybrid electrode material in an organic electrolyte (1 M TEABF4 in acetonitrile) supercapacitor. Our results show the efficient electroactivity of the PW12 cluster even in the absence of protons, providing a higher voltage than aqueous electrolytes and fast and reversible redox activity. The hybrid material shows a combination of double-layer (AC) and redox (PW12) capacities leading to an increase (36%) in volumetric capacitance with respect to pristine AC in the same organic electrolyte (1 M TEABF4 in acetonitrile). Remarkably, we were able to quantify this increase as coming predominantly from non-diffusion-limited processes thanks to the utterly dispersed nature of POMs. Moreover, the hybrid material delivers a good rate capability and excellent cycle stability (93% retention of the initial capacitance after 10,000 cycles). This study has a profound significance on improving capacitance of carbon-based materials in organic electrolytes. 22020-01-0120202020-01-01Articlehttp://purl.org/coar/resource_type/c_6501SMURhttp://purl.org/coar/version/c_71e4c1898caa6e32info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/236001https://dx.doi.org/urn:doi:10.1016/j.electacta.2020.137007reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengAgencia Estatal de Investigación https://doi.org/10.13039/501100011033 RTI2018-099826-B-I00Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2017-0706Agència de Gestió d'Ajuts Universitaris i de Recerca https://doi.org/10.13039/501100003030 2017/SGR-00870open accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2360012026-06-06T12:50:31Z
dc.title.none.fl_str_mv Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
title Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
spellingShingle Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
Zhu, Jun-Jie|||0000-0002-8024-099X
Supercapacitor
Polyoxometalate
Organic electrolyte
Hybrid electrode
title_short Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
title_full Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
title_fullStr Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
title_full_unstemmed Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
title_sort Can polyoxometalates enhance the capacitance and energy density of activated carbon in organic electrolyte supercapacitors?
dc.creator.none.fl_str_mv Zhu, Jun-Jie|||0000-0002-8024-099X
Benages-Vilau, Raúl|||0000-0003-0875-124X
Gómez-Romero, Pedro|||0000-0002-6208-5340
author Zhu, Jun-Jie|||0000-0002-8024-099X
author_facet Zhu, Jun-Jie|||0000-0002-8024-099X
Benages-Vilau, Raúl|||0000-0003-0875-124X
Gómez-Romero, Pedro|||0000-0002-6208-5340
author_role author
author2 Benages-Vilau, Raúl|||0000-0003-0875-124X
Gómez-Romero, Pedro|||0000-0002-6208-5340
author2_role author
author
dc.subject.none.fl_str_mv Supercapacitor
Polyoxometalate
Organic electrolyte
Hybrid electrode
topic Supercapacitor
Polyoxometalate
Organic electrolyte
Hybrid electrode
description Polyoxometalates (POMs) have been shown to work as faradaic additives to activated carbon (AC) in acidic aqueous electrolytes. Yet, their use in organic media allows not only for added capacity but also higher voltage. Here we show that the tetraethylammonium derivative of phosphotungstate [PWO] (PW12) can be homogeneously distributed throughout the pores of activated carbon (AC) in organic solvents such as N,N'-dimethylformamide (DMF) and demonstrate the use of this hybrid electrode material in an organic electrolyte (1 M TEABF4 in acetonitrile) supercapacitor. Our results show the efficient electroactivity of the PW12 cluster even in the absence of protons, providing a higher voltage than aqueous electrolytes and fast and reversible redox activity. The hybrid material shows a combination of double-layer (AC) and redox (PW12) capacities leading to an increase (36%) in volumetric capacitance with respect to pristine AC in the same organic electrolyte (1 M TEABF4 in acetonitrile). Remarkably, we were able to quantify this increase as coming predominantly from non-diffusion-limited processes thanks to the utterly dispersed nature of POMs. Moreover, the hybrid material delivers a good rate capability and excellent cycle stability (93% retention of the initial capacitance after 10,000 cycles). This study has a profound significance on improving capacitance of carbon-based materials in organic electrolytes.
publishDate 2020
dc.date.none.fl_str_mv 2
2020-01-01
2020
2020-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
SMUR
http://purl.org/coar/version/c_71e4c1898caa6e32
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/236001
https://dx.doi.org/urn:doi:10.1016/j.electacta.2020.137007
url https://ddd.uab.cat/record/236001
https://dx.doi.org/urn:doi:10.1016/j.electacta.2020.137007
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación https://doi.org/10.13039/501100011033 RTI2018-099826-B-I00
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2017-0706
Agència de Gestió d'Ajuts Universitaris i de Recerca https://doi.org/10.13039/501100003030 2017/SGR-00870
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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