Briega-Martos Valentín, Cheuquepán William, Feliu Juan M
Instituto de Electroquímica, Universidad de Alicante, Apdo. 99, E-03080 Alicante,Spain.
J Phys Chem Lett. 2021 Feb 18;12(6):1588-1592. doi: 10.1021/acs.jpclett.0c03510. Epub 2021 Feb 4.
In this work, external infrared reflection absorption spectroscopy (IRRAS) is successfully employed for the detection of intermediate species in the oxygen reduction reaction (ORR) mechanism on a flat and well-defined Pt surface. Superoxide anion species (O) are detected on the Pt(111) surface in an O-saturated solution with a NaF/HClO mixture with pH 5.5 by the observation of a O-O vibration band at 1080 cm. The observation of O without the use of any other additional method of signal enhancement is possible because in these experimental conditions O is the main ORR-generated intermediate and its reactivity is limited in this pH. This leads to the accumulation of O near the Pt surface, facilitating its identification.
在本工作中，外部红外反射吸收光谱（IRRAS）成功用于检测平整且明确的铂表面上氧还原反应（ORR）机制中的中间物种。在pH为5.5的含NaF/HClO混合物的O饱和溶液中，通过观察1080 cm处的O—O振动带，在Pt(111)表面检测到超氧阴离子物种（O）。在这些实验条件下，由于O是ORR产生的主要中间物种且其反应活性在该pH下受限，因此无需使用任何其他额外的信号增强方法即可观察到O。这导致O在铂表面附近积累，便于其识别。
