Infrared Reflection Absorption Spectroscopy of OH Adsorption on the Low Index Planes of Pt
Infrared Reflection Absorption Spectroscopy of OH Adsorption on the Low Index Planes of Pt
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DOI：
10.1007/s12678-014-0245-7
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发表时间：
2015-05
期刊：
影响因子：
3.1
通讯作者：
Hiroyuki Tanaka;S. Sugawara;K. Shinohara;T. Ueno;Shunsuke Suzuki;Nagahiro Hoshi;Masashi Nakamura
中科院分区：
文献类型：
--
作者：
Hiroyuki Tanaka;S. Sugawara;K. Shinohara;T. Ueno;Shunsuke Suzuki;Nagahiro Hoshi;Masashi Nakamura
在电化学环境中，使用红外反射吸收光谱 (IRAS) 在 Pt 的低折射率平面上研究了氢氧化物 (OHad) 在 Pt 上的吸附。我们讨论了 Pt-OH 的 OH 弯曲模式的积分能带强度 (δPtOH) 与 Pt 氧化物形成的电荷密度之间的相关性。 δPtOH 的能带在 1100 cm−1 附近观察到，起始电位取决于表面结构。 Pt(110)和Pt(100)上δPtOH的起始电位与氢吸附/解吸电位区域重叠。 0.9 V vs RHE 时 δPtOH 的积分带强度的顺序与氧还原反应 (ORR) 活性的顺序相反。这一发现支持 OHadis 是使 ORR 失活的物种之一。
The adsorption of hydroxide (OHad) on Pt has been studied on the low index planes of Pt using infrared reflection absorption spectroscopy (IRAS) in electrochemical environments. We discuss the correlation between the integrated band intensity of the bending mode of OH of Pt–OH (δPtOH) and the charge density of the oxide formation of Pt. The band ofδPtOHis observed around 1100 cm−1, and the onset potential depends on the surface structure. The onset potential ofδPtOHon Pt(110) and Pt(100) overlaps with the hydrogen adsorption/desorption potential region. The order of the integrated band intensity ofδPtOHat 0.9 V vs RHE is opposite to the order of the oxygen reduction reaction (ORR) activity. This finding supports that the OHadis one of the species deactivating the ORR.