Oxygen Reduction Reaction on Au Revisited at Different pH Values using in situ Surface-Enhanced Raman Spectroscopy.,ChemSusChem

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Oxygen Reduction Reaction on Au Revisited at Different pH Values using in situ Surface-Enhanced Raman Spectroscopy.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-02-11 , DOI: 10.1002/cssc.202000086
Hai-Yang Yu _{1,

2} , Xiao-Feng Li _{1,

2} , Tian-Heng Zhang _{1,

2} , Jiao Liu _{1,

2,

3} , Jing-Hua Tian _{1,

2} , Ruizhi Yang _{1,

2}

Affiliation

The mechanisms of the oxygen reduction reaction (ORR) on Au surfaces are revisited in electrolytes with different pH values by using a combination of electrochemical and in situ surface-enhanced Raman scattering spectroscopy. Surprisingly, the in situ Raman signal of the O-O stretching vibration was detected during the ORR on a Au surface by using a λ=785 nm laser. Both the intermediate products O2 - and H2 O2 could be detected, which indicates the difficulty of the further reduction H2 O2 and results in a lower electron transfer number, especially in neutral and acid electrolytes. The weak absorption ability of HO2 on the Au surface may explain the poor ORR in neutral and acid electrolytes. This work not only provides a deep insight to understand the reduction mechanisms of O2 on Au in electrolytes with different pH values but also supplies a new idea for the selection and optimization of electrolytes and efficient electrocatalysts for oxygen reduction.

中文翻译：

使用原位表面增强拉曼光谱在不同pH值下对Au进行氧还原反应。

通过结合使用电化学和原位表面增强拉曼散射光谱技术，在具有不同pH值的电解质中重新探讨了Au表面上的氧还原反应（ORR）的机理。令人惊讶地，通过使用λ＝ 785nm的激光器在Au表面上的ORR期间检测到OO拉伸振动的原位拉曼信号。中间产物O2-和H2 O2都可以被检测到，这表明进一步还原H2 O2的困难并且导致较低的电子转移数，特别是在中性和酸性电解质中。HO2在Au表面的吸收能力很弱，可能解释了中性和酸性电解质中的ORR较差。

更新日期：2020-02-11

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