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Electrochemical Adsorption on Pt Nanoparticles in Alkaline Solution Observed Using In Situ High Energy Resolution X-ray Absorption Spectroscopy

1
Graduate School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
2
Materials Sciences Research Center, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo, Hyogo 679-5148, Japan
3
Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(4), 642; https://doi.org/10.3390/nano9040642
Received: 1 March 2019 / Revised: 12 April 2019 / Accepted: 15 April 2019 / Published: 20 April 2019
(This article belongs to the Special Issue Nanomaterials in Environmental Friendly Fuel Cell)
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Abstract

The oxygen reduction reaction (ORR) on Pt/C in alkaline solution was studied by in situ high energy resolution X-ray absorption spectroscopy. To discuss the X-ray absorption near-edge structure (XANES), this paper introduced the rate of change of the Δμ (RCD), which is an analysis method that is sensitive to surface adsorption. The surface adsorptions as hydrogen (below 0.34 V), superoxide anion (from 0.34 V to 0.74 V), hydroxyl species (from 0.44 V to 0.74 V), atomic oxygen (above 0.74 V), and α-PtO2 (above 0.94 V) were distinguished. It is clarified that the catalytic activity in an alkaline solution is enhanced by the stability of atomic oxygen and the low stability of superoxide anion/peroxide adsorption on the platinum surface. View Full-Text
Keywords: ORR; carbon-supported platinum nanoparticles; superoxide anion; alkaline solution; Δμ XANES; HERFD-XAS ORR; carbon-supported platinum nanoparticles; superoxide anion; alkaline solution; Δμ XANES; HERFD-XAS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kusano, S.; Matsumura, D.; Ishii, K.; Tanaka, H.; Mizuki, J. Electrochemical Adsorption on Pt Nanoparticles in Alkaline Solution Observed Using In Situ High Energy Resolution X-ray Absorption Spectroscopy. Nanomaterials 2019, 9, 642.

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