NMR spectroelectrochemistry in studies of hydroquinone oxidation by polyaniline thin films

作者：Zhang, Xiao-Ping; Jiang, Wen-Long; Cao, Shuo-Hui^*; Sun, Hui-Jun; You, Xue-Qiu; Cai, Shu-Hui; Wang, Jiang-Li; Zhao, Cheng-Sen; Wang, Xin; Chen, Zhong^*; Sun, Shi-Gang

来源：Electrochimica Acta, 2018, 273: 300-306.

DOI：10.1016/j.electacta.2018.04.048

• EC-NMR
• Polyaniline
• Electro-catalysis
• Hydroquinone
• In situ

In this paper, we developed a direct way for the study of hydroquinone oxidation through in situ electrochemistry-combined nuclear magnetic resonance (EC-NMR). Electro-polymerization-induced nano-polyaniline film was utilized as the catalyst in the process of electrochemical oxidation of hydroquinone. In situ EC-NMR provides a powerful tool to probe products distribution and reaction rate, which could be useful to investigate electro-catalytic mechanism and evaluate the electro-catalytic capacity. To study the influence of both protic and aprotic media in the electrocatalytic process, we mixed water and dimethylsulfoxide to mimic possible real-life electrochemical environments. The proposed in situ EC-NMR is capable of quantitatively monitoring the generation of products under varied solvent composition and pH values. A positive effect to electro-catalysis capacity is observed when the concentration of DMSO or water is increased from the volume equivalent point, implying that there should be a competition between protic and aprotic media, which can be characterized by EC-NMR technique.

• 出版日期2018-5-20
• 单位厦门大学