Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction

Our previous study shows that the activity of the cathodic reaction (oxygen reduction reaction: ORR) of fuel cells is increased markedly by the adsorption of alkyl amines on a well-defined Pt(111) electrode. On Pt(100) and Pt(110) electrodes, however, the adsorption of alkyl amines deactivates the O...

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Main Authors:	Nagahiro Hoshi, Keiichiro Saikawa, Masashi Nakamura
Format:	Article
Language:	English
Published:	Elsevier 2019-09-01
Series:	Electrochemistry Communications
Online Access:	http://www.sciencedirect.com/science/article/pii/S1388248119301997

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record_format	Article
spelling	doaj-ff60d9536d604661a72e2a6a7f962e2f2020-11-25T02:34:05ZengElsevierElectrochemistry Communications1388-24812019-09-01106Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reactionNagahiro Hoshi0Keiichiro Saikawa1Masashi Nakamura2Corresponding author.; Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, JapanDepartment of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, JapanDepartment of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, JapanOur previous study shows that the activity of the cathodic reaction (oxygen reduction reaction: ORR) of fuel cells is increased markedly by the adsorption of alkyl amines on a well-defined Pt(111) electrode. On Pt(100) and Pt(110) electrodes, however, the adsorption of alkyl amines deactivates the ORR significantly. We have studied the possible factors of the activation and deactivation by infrared (IR) reflection absorption spectroscopy. An IR band of icelike water is found on all the electrodes after the modification with alkyl amines. The band of the icelike water on Pt(111) is located at a higher wavenumber than those on Pt(100) and Pt(110). These findings indicate that the cluster size of icelike water on Pt(111) is smaller than those on Pt(100) and Pt(110). The cluster size of the ice correlates with the ORR activity on Pt electrodes. Keywords: Oxygen reduction reaction, Single crystal electrodes of Pt, Icelike water, Cluster size, Octylamine, Alkyl amine with pyrene ringhttp://www.sciencedirect.com/science/article/pii/S1388248119301997
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Nagahiro Hoshi Keiichiro Saikawa Masashi Nakamura
spellingShingle	Nagahiro Hoshi Keiichiro Saikawa Masashi Nakamura Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction Electrochemistry Communications
author_facet	Nagahiro Hoshi Keiichiro Saikawa Masashi Nakamura
author_sort	Nagahiro Hoshi
title	Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction
title_short	Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction
title_full	Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction
title_fullStr	Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction
title_full_unstemmed	Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction
title_sort	structural effects on water molecules on the low index planes of pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction
publisher	Elsevier
series	Electrochemistry Communications
issn	1388-2481
publishDate	2019-09-01
description	Our previous study shows that the activity of the cathodic reaction (oxygen reduction reaction: ORR) of fuel cells is increased markedly by the adsorption of alkyl amines on a well-defined Pt(111) electrode. On Pt(100) and Pt(110) electrodes, however, the adsorption of alkyl amines deactivates the ORR significantly. We have studied the possible factors of the activation and deactivation by infrared (IR) reflection absorption spectroscopy. An IR band of icelike water is found on all the electrodes after the modification with alkyl amines. The band of the icelike water on Pt(111) is located at a higher wavenumber than those on Pt(100) and Pt(110). These findings indicate that the cluster size of icelike water on Pt(111) is smaller than those on Pt(100) and Pt(110). The cluster size of the ice correlates with the ORR activity on Pt electrodes. Keywords: Oxygen reduction reaction, Single crystal electrodes of Pt, Icelike water, Cluster size, Octylamine, Alkyl amine with pyrene ring
url	http://www.sciencedirect.com/science/article/pii/S1388248119301997
work_keys_str_mv	AT nagahirohoshi structuraleffectsonwatermoleculesonthelowindexplanesofptmodifiedwithalkylaminesandthecorrelationwiththeactivityoftheoxygenreductionreaction AT keiichirosaikawa structuraleffectsonwatermoleculesonthelowindexplanesofptmodifiedwithalkylaminesandthecorrelationwiththeactivityoftheoxygenreductionreaction AT masashinakamura structuraleffectsonwatermoleculesonthelowindexplanesofptmodifiedwithalkylaminesandthecorrelationwiththeactivityoftheoxygenreductionreaction
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Structural effects on water molecules on the low index planes of Pt modified with alkyl amines and the correlation with the activity of the oxygen reduction reaction

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