ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs

Abstract Although numerous reports have introduced non precious electrocatalysts for methanol oxidation, most of those studies did not consider the corresponding high onset potential which restricts utilization in real fuel cells. In this study, an −90 mV [vs. Ag/AgCl] onset potential non-precious e...

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Autores principales:	Zafar Khan Ghouri, Saeed Al-Meer, Nasser A. M. Barakat, Hak Yong Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/be19e4b3d2004751ad438174065704c3
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spelling	oai:doaj.org-article:be19e4b3d2004751ad438174065704c32021-12-02T12:32:52ZZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs10.1038/s41598-017-01463-32045-2322https://doaj.org/article/be19e4b3d2004751ad438174065704c32017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01463-3https://doaj.org/toc/2045-2322Abstract Although numerous reports have introduced non precious electrocatalysts for methanol oxidation, most of those studies did not consider the corresponding high onset potential which restricts utilization in real fuel cells. In this study, an −90 mV [vs. Ag/AgCl] onset potential non-precious electrocatalyst is introduced as an applicable anode material for the direct methanol fuel cells. Moreover, the proposed material was prepared from a cheap and abundantly existing resource; the spent coffee grounds. Typically, the spent coffee grounds were facilely converted to core@shell (ZnO@C) microspheres through a two-step approach, involving chemical activation and a subsequent calcination at temperature of 700 °C. Activation of the carbon derived from the spent coffee grounds was performed with ZnCl2 which acts as pore-forming agent as well as a precursor for the ZnO. The structure and morphology were characterized by (XRD), (SEM), and (TEM) analyses while the electrochemical characterizations was evaluated by cyclic voltammetry (CV) technique. Besides the comparatively very low onset potential, the introduced microspheres exhibited relatively high current density; 17 mA/cm2. Overall, based on the advantages of the green source of carbon and the good electrocatalytic activity, the spent coffee grounds-derived carbon can be considered a promise anode material for the DMFCs.Zafar Khan GhouriSaeed Al-MeerNasser A. M. BarakatHak Yong KimNature 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 Zafar Khan Ghouri Saeed Al-Meer Nasser A. M. Barakat Hak Yong Kim ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs
description	Abstract Although numerous reports have introduced non precious electrocatalysts for methanol oxidation, most of those studies did not consider the corresponding high onset potential which restricts utilization in real fuel cells. In this study, an −90 mV [vs. Ag/AgCl] onset potential non-precious electrocatalyst is introduced as an applicable anode material for the direct methanol fuel cells. Moreover, the proposed material was prepared from a cheap and abundantly existing resource; the spent coffee grounds. Typically, the spent coffee grounds were facilely converted to core@shell (ZnO@C) microspheres through a two-step approach, involving chemical activation and a subsequent calcination at temperature of 700 °C. Activation of the carbon derived from the spent coffee grounds was performed with ZnCl2 which acts as pore-forming agent as well as a precursor for the ZnO. The structure and morphology were characterized by (XRD), (SEM), and (TEM) analyses while the electrochemical characterizations was evaluated by cyclic voltammetry (CV) technique. Besides the comparatively very low onset potential, the introduced microspheres exhibited relatively high current density; 17 mA/cm2. Overall, based on the advantages of the green source of carbon and the good electrocatalytic activity, the spent coffee grounds-derived carbon can be considered a promise anode material for the DMFCs.
format	article
author	Zafar Khan Ghouri Saeed Al-Meer Nasser A. M. Barakat Hak Yong Kim
author_facet	Zafar Khan Ghouri Saeed Al-Meer Nasser A. M. Barakat Hak Yong Kim
author_sort	Zafar Khan Ghouri
title	ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs
title_short	ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs
title_full	ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs
title_fullStr	ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs
title_full_unstemmed	ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs
title_sort	zno@c (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for dmfcs
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/be19e4b3d2004751ad438174065704c3
work_keys_str_mv	AT zafarkhanghouri znoccoreshellmicrospheresderivedfromspentcoffeegroundsasapplicablenonpreciouselectrodematerialfordmfcs AT saeedalmeer znoccoreshellmicrospheresderivedfromspentcoffeegroundsasapplicablenonpreciouselectrodematerialfordmfcs AT nasserambarakat znoccoreshellmicrospheresderivedfromspentcoffeegroundsasapplicablenonpreciouselectrodematerialfordmfcs AT hakyongkim znoccoreshellmicrospheresderivedfromspentcoffeegroundsasapplicablenonpreciouselectrodematerialfordmfcs
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ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs

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