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使用原位高能分辨率X射线吸收光谱法观察碱性溶液中铂纳米颗粒上的电化学吸附

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

作者信息

Kusano Shogo, Matsumura Daiju, Ishii Kenji, Tanaka Hirohisa, Mizuki Jun'ichiro

机构信息

Graduate School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan.

Materials Sciences Research Center, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo, Hyogo 679-5148, Japan.

出版信息

Nanomaterials (Basel). 2019 Apr 20;9(4):642. doi: 10.3390/nano9040642.

DOI:10.3390/nano9040642
PMID:31009992
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6523608/
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 Δ (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-PtO (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.

摘要

采用原位高能分辨X射线吸收光谱研究了碱性溶液中Pt/C上的氧还原反应（ORR）。为了讨论X射线吸收近边结构（XANES），本文引入了Δ（RCD）的变化率，这是一种对表面吸附敏感的分析方法。区分了表面吸附的氢（低于0.34 V）、超氧阴离子（0.34 V至0.74 V）、羟基物种（0.44 V至0.74 V）、原子氧（高于0.74 V）和α-PtO（高于0.94 V）。结果表明，铂表面原子氧的稳定性以及超氧阴离子/过氧化物吸附的低稳定性增强了碱性溶液中的催化活性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/edffa3162b0c/nanomaterials-09-00642-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/6864269a24a1/nanomaterials-09-00642-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/200528396794/nanomaterials-09-00642-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/ffb2f80ceda6/nanomaterials-09-00642-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/5940a6f99048/nanomaterials-09-00642-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/de891c58308f/nanomaterials-09-00642-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/ee935e1acef7/nanomaterials-09-00642-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/78c3a9b9d89a/nanomaterials-09-00642-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/edffa3162b0c/nanomaterials-09-00642-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/6864269a24a1/nanomaterials-09-00642-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/200528396794/nanomaterials-09-00642-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/ffb2f80ceda6/nanomaterials-09-00642-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/5940a6f99048/nanomaterials-09-00642-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/de891c58308f/nanomaterials-09-00642-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/ee935e1acef7/nanomaterials-09-00642-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/78c3a9b9d89a/nanomaterials-09-00642-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ba3f/6523608/edffa3162b0c/nanomaterials-09-00642-g008.jpg

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