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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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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