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Structural Effects on the Activity for the Oxygen Reduction Reaction on the High-Index Planes of Palladium in Alkali Solution

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Abstract

Herein, the structural effects on the oxygen reduction reaction (ORR) were studied using the high-index planes of Pd in a 0.05 M KOH solution. The examined high-index planes comprised the (111) terraces (n(111) − (111), n(111) − (100) series) and the (100) terrace (n(100) − (111), n(100) − (110) series). The ORR activity increased with an increase in the terrace atomic rows, n, on the surfaces with the (111) terrace. On the surfaces of the (100) terrace, the activity was enhanced when the terrace width was increased 2 ≤ n ≤ 5; however, the activity reaches a plateau on the surfaces with 5 ≤ n. This result differs from that in a 0.1 M HClO4 solution, where the ORR activity is linearly enhanced with an increasing (100) terrace atom density. The ORR activities on the surfaces with the (111) terraces were higher than those with the (100) terraces at 5 ≤ n. The ORR is deactivated with increasing coverage of Pd oxides (θOH) on the surfaces with the same terrace structure, showing that Pd oxides are the blocking species of the ORR, as is the case with Pt electrodes. However, the values of θOH on the surfaces with the (111) terraces are as high as those with the (100) terraces at 5 ≤ n, despite the ORR activities on the surfaces with the (111) terrace being higher than those on the surfaces with (100) terraces.

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Funding

This work was partially supported by the New Energy and Industrial Technology Development Organization (NEDO).

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Authors and Affiliations

  1. Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi–cho 1–33, Inage–ku, Chiba, 263–8522, Japan

    Fumiya Kiguchi, Masashi Nakamura & Nagahiro Hoshi

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  1. Fumiya Kiguchi
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  2. Masashi Nakamura
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  3. Nagahiro Hoshi
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Correspondence to Nagahiro Hoshi.

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Kiguchi, F., Nakamura, M. & Hoshi, N. Structural Effects on the Activity for the Oxygen Reduction Reaction on the High-Index Planes of Palladium in Alkali Solution. Electrocatalysis 12, 691–697 (2021). https://doi.org/10.1007/s12678-021-00681-8

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