Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion

Abstract During microbial electrosynthesis (MES) driven CO2 reduction, cathode plays a vital role by donating electrons to microbe. Here, we exploited the advantage of reduced graphene oxide (RGO) paper as novel cathode material to enhance electron transfer between the cathode and microbe, which in...

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Autores principales:	Nabin Aryal, Arnab Halder, Minwei Zhang, Patrick R. Whelan, Pier-Luc Tremblay, Qijin Chi, Tian Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/33cf66306ece48aca7f00e9e91e306ab
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spelling	oai:doaj.org-article:33cf66306ece48aca7f00e9e91e306ab2021-12-02T11:52:20ZFreestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion10.1038/s41598-017-09841-72045-2322https://doaj.org/article/33cf66306ece48aca7f00e9e91e306ab2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-09841-7https://doaj.org/toc/2045-2322Abstract During microbial electrosynthesis (MES) driven CO2 reduction, cathode plays a vital role by donating electrons to microbe. Here, we exploited the advantage of reduced graphene oxide (RGO) paper as novel cathode material to enhance electron transfer between the cathode and microbe, which in turn facilitated CO2 reduction. The acetate production rate of Sporomusa ovata-driven MES reactors was 168.5 ± 22.4 mmol m−2 d−1 with RGO paper cathodes poised at −690 mV versus standard hydrogen electrode. This rate was approximately 8 fold faster than for carbon paper electrodes of the same dimension. The current density with RGO paper cathodes of 2580 ± 540 mA m−2 was increased 7 fold compared to carbon paper cathodes. This also corresponded to a better cathodic current response on their cyclic voltammetric curves. The coulombic efficiency for the electrons conversion into acetate was 90.7 ± 9.3% with RGO paper cathodes and 83.8 ± 4.2% with carbon paper cathodes, respectively. Furthermore, more intensive cell attachment was observed on RGO paper electrodes than on carbon paper electrodes with confocal laser scanning microscopy and scanning electron microscopy. These results highlight the potential of RGO paper as a promising cathode for MES from CO2.Nabin AryalArnab HalderMinwei ZhangPatrick R. WhelanPier-Luc TremblayQijin ChiTian ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nabin Aryal Arnab Halder Minwei Zhang Patrick R. Whelan Pier-Luc Tremblay Qijin Chi Tian Zhang Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion
description	Abstract During microbial electrosynthesis (MES) driven CO2 reduction, cathode plays a vital role by donating electrons to microbe. Here, we exploited the advantage of reduced graphene oxide (RGO) paper as novel cathode material to enhance electron transfer between the cathode and microbe, which in turn facilitated CO2 reduction. The acetate production rate of Sporomusa ovata-driven MES reactors was 168.5 ± 22.4 mmol m−2 d−1 with RGO paper cathodes poised at −690 mV versus standard hydrogen electrode. This rate was approximately 8 fold faster than for carbon paper electrodes of the same dimension. The current density with RGO paper cathodes of 2580 ± 540 mA m−2 was increased 7 fold compared to carbon paper cathodes. This also corresponded to a better cathodic current response on their cyclic voltammetric curves. The coulombic efficiency for the electrons conversion into acetate was 90.7 ± 9.3% with RGO paper cathodes and 83.8 ± 4.2% with carbon paper cathodes, respectively. Furthermore, more intensive cell attachment was observed on RGO paper electrodes than on carbon paper electrodes with confocal laser scanning microscopy and scanning electron microscopy. These results highlight the potential of RGO paper as a promising cathode for MES from CO2.
format	article
author	Nabin Aryal Arnab Halder Minwei Zhang Patrick R. Whelan Pier-Luc Tremblay Qijin Chi Tian Zhang
author_facet	Nabin Aryal Arnab Halder Minwei Zhang Patrick R. Whelan Pier-Luc Tremblay Qijin Chi Tian Zhang
author_sort	Nabin Aryal
title	Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion
title_short	Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion
title_full	Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion
title_fullStr	Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion
title_full_unstemmed	Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion
title_sort	freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient co2 conversion
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/33cf66306ece48aca7f00e9e91e306ab
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_version_	1718395095607148544

Freestanding and flexible graphene papers as bioelectrochemical cathode for selective and efficient CO2 conversion

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