Hydrogen evolution reaction highly electrocatalyzed by MWCNT/N-octylpyridinum hexafluorophosphate metal-free system

Leyla Gidi; Roxana Arce; José Ibarra; M. Isaacs; M. J. Aguirre; Galo Ramírez

doi:10.1016/j.electacta.2021.137859

Hydrogen evolution reaction highly electrocatalyzed by MWCNT/N-octylpyridinum hexafluorophosphate metal-free system

Leyla Gidi, Roxana Arce, José Ibarra, M. Isaacs, M. J. Aguirre, Galo Ramírez

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

A mixed electrocatalyst that consists of multi walled carbon nanotubes (MWCNTs) and the ionic liquid (IL) N-octylpyridinum hexafluorophosphate (OPyPF₆) as binder (MWCNT/IL system) was used in the study of hydrogen evolution reaction. This electrocatalyst was compared to graphite/mineral oil (Gr), graphite/OPyPF₆ (Gr/IL), MWCNT/mineral oil (MWCNT) systems. All systems were characterized by cyclic voltammetry determining that MWCNT/IL system is highly electrocatalytic (E onset = -0.3 V vs Ag/AgCl) in relation to the other systems studied containing MWCNT or IL separately. The presence of each of the components that form the electrodic surface is corroborated by XRD, Raman, and FESEM-EDX, and it is demonstrated by chronoamperometric analysis that MWCNT/IL system is highly stable. The efficiency of the electrode, determined by its electrocatalytic activity, is confirmed by the quantification by gas chromatography of the hydrogen produced. Moreover, an elevated TON value (16274) and faradaic efficiency close to 60% are calculated, in comparison to other electrocatalysts found in literature. All these attractive properties are complemented by the fact that the MWCNT/IL system is simple, novel and easy to prepare.

Original language	English
Article number	137859
Journal	Electrochimica Acta
Volume	372
DOIs	https://doi.org/10.1016/j.electacta.2021.137859
Publication status	Published - 10 Mar 2021

Keywords

Carbon nanotubes
Electrocatalysis
Hydrogen evolution reaction
Ionic liquids

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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10.1016/j.electacta.2021.137859

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@article{519354107d084ef4a4bc96ddecfa81d3,

title = "Hydrogen evolution reaction highly electrocatalyzed by MWCNT/N-octylpyridinum hexafluorophosphate metal-free system",

abstract = "A mixed electrocatalyst that consists of multi walled carbon nanotubes (MWCNTs) and the ionic liquid (IL) N-octylpyridinum hexafluorophosphate (OPyPF6) as binder (MWCNT/IL system) was used in the study of hydrogen evolution reaction. This electrocatalyst was compared to graphite/mineral oil (Gr), graphite/OPyPF6 (Gr/IL), MWCNT/mineral oil (MWCNT) systems. All systems were characterized by cyclic voltammetry determining that MWCNT/IL system is highly electrocatalytic (E onset = -0.3 V vs Ag/AgCl) in relation to the other systems studied containing MWCNT or IL separately. The presence of each of the components that form the electrodic surface is corroborated by XRD, Raman, and FESEM-EDX, and it is demonstrated by chronoamperometric analysis that MWCNT/IL system is highly stable. The efficiency of the electrode, determined by its electrocatalytic activity, is confirmed by the quantification by gas chromatography of the hydrogen produced. Moreover, an elevated TON value (16274) and faradaic efficiency close to 60% are calculated, in comparison to other electrocatalysts found in literature. All these attractive properties are complemented by the fact that the MWCNT/IL system is simple, novel and easy to prepare.",

keywords = "Carbon nanotubes, Electrocatalysis, Hydrogen evolution reaction, Ionic liquids",

author = "Leyla Gidi and Roxana Arce and Jos{\'e} Ibarra and M. Isaacs and Aguirre, {M. J.} and Galo Ram{\'i}rez",

note = "Funding Information: This work was supported by FONDECYT Projects 1170340 ; 1181226 and 1160324 , UNAB Project No. DI-06-19/R , Doctoral Scholarship CONICYT Project No.: 2117054 , eqm project 150020 and Dicyt-USACH support. Publisher Copyright: {\textcopyright} 2021 Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

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month = mar,

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doi = "10.1016/j.electacta.2021.137859",

language = "English",

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journal = "Electrochimica Acta",

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T1 - Hydrogen evolution reaction highly electrocatalyzed by MWCNT/N-octylpyridinum hexafluorophosphate metal-free system

AU - Gidi, Leyla

AU - Arce, Roxana

AU - Ibarra, José

AU - Isaacs, M.

AU - Aguirre, M. J.

AU - Ramírez, Galo

N1 - Funding Information: This work was supported by FONDECYT Projects 1170340 ; 1181226 and 1160324 , UNAB Project No. DI-06-19/R , Doctoral Scholarship CONICYT Project No.: 2117054 , eqm project 150020 and Dicyt-USACH support. Publisher Copyright: © 2021 Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3/10

Y1 - 2021/3/10

N2 - A mixed electrocatalyst that consists of multi walled carbon nanotubes (MWCNTs) and the ionic liquid (IL) N-octylpyridinum hexafluorophosphate (OPyPF6) as binder (MWCNT/IL system) was used in the study of hydrogen evolution reaction. This electrocatalyst was compared to graphite/mineral oil (Gr), graphite/OPyPF6 (Gr/IL), MWCNT/mineral oil (MWCNT) systems. All systems were characterized by cyclic voltammetry determining that MWCNT/IL system is highly electrocatalytic (E onset = -0.3 V vs Ag/AgCl) in relation to the other systems studied containing MWCNT or IL separately. The presence of each of the components that form the electrodic surface is corroborated by XRD, Raman, and FESEM-EDX, and it is demonstrated by chronoamperometric analysis that MWCNT/IL system is highly stable. The efficiency of the electrode, determined by its electrocatalytic activity, is confirmed by the quantification by gas chromatography of the hydrogen produced. Moreover, an elevated TON value (16274) and faradaic efficiency close to 60% are calculated, in comparison to other electrocatalysts found in literature. All these attractive properties are complemented by the fact that the MWCNT/IL system is simple, novel and easy to prepare.

AB - A mixed electrocatalyst that consists of multi walled carbon nanotubes (MWCNTs) and the ionic liquid (IL) N-octylpyridinum hexafluorophosphate (OPyPF6) as binder (MWCNT/IL system) was used in the study of hydrogen evolution reaction. This electrocatalyst was compared to graphite/mineral oil (Gr), graphite/OPyPF6 (Gr/IL), MWCNT/mineral oil (MWCNT) systems. All systems were characterized by cyclic voltammetry determining that MWCNT/IL system is highly electrocatalytic (E onset = -0.3 V vs Ag/AgCl) in relation to the other systems studied containing MWCNT or IL separately. The presence of each of the components that form the electrodic surface is corroborated by XRD, Raman, and FESEM-EDX, and it is demonstrated by chronoamperometric analysis that MWCNT/IL system is highly stable. The efficiency of the electrode, determined by its electrocatalytic activity, is confirmed by the quantification by gas chromatography of the hydrogen produced. Moreover, an elevated TON value (16274) and faradaic efficiency close to 60% are calculated, in comparison to other electrocatalysts found in literature. All these attractive properties are complemented by the fact that the MWCNT/IL system is simple, novel and easy to prepare.

KW - Carbon nanotubes

KW - Electrocatalysis

KW - Hydrogen evolution reaction

KW - Ionic liquids

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U2 - 10.1016/j.electacta.2021.137859

DO - 10.1016/j.electacta.2021.137859

M3 - Article

AN - SCOPUS:85100388377

SN - 0013-4686

VL - 372

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 137859

ER -

Hydrogen evolution reaction highly electrocatalyzed by MWCNT/N-octylpyridinum hexafluorophosphate metal-free system

Abstract

Keywords

ASJC Scopus subject areas

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