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

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/487085.do
DOI
10.1038/s41598-017-01463-3
Title
ZnO@C (core@ shell) microspheres derived from spent coffee grounds asapplicable non-precious electrode material for DMFCs
Description
This Publication was made possible by NPRP grant # [8-1344-1-246] fromthe Qatar National Research Fund (a member of Qatar Foundation). Thefindings achieved herein are solely the responsibility of authors.
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 degrees 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/cm(2). 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.
provenance
Made available in Cube on 2018-09-28T16:24:51Z (GMT). No. of bitstreams: 0
language
English
author
Ghouri, Zafar Khan
Al-Meer, Saeed
Barakat, Nasser A. M.
Kim, Hak Yong
orcid
Kim, Hak Yong/0000-0002-4133-124X
accessioned
2018-09-28T16:24:51Z
available
2018-09-28T16:24:51Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/487085.do
Funder
교육부
Funding Program
BK21플러스사업(0.5)
Project ID
1345273931
Jurisdiction
Rep.of Korea
Project Name
Applied Materials Institute for BIN Convergence Technology
rights
openAccess
type
article


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