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利用单晶旋转圆盘电极技术(Hanging Meniscus Rotating Disk Electrode,HMRD)在硫酸和高氯酸溶液中,分别研究了甘氨酸修饰的Pt(111)电极表面氧分子的电催化还原反应.实验发现:在硫酸溶液中,经甘氨酸修饰的Pt(111)电极表面的氧还原活性明显提高,其中氧还原的半波电位与Pt(111)电极的相比正移约0.1 V,而在高氯酸溶液中,甘氨酸修饰的Pt(111)电极的活性几乎没有发生变化.该实验结果表明:甘氨酸修饰的Pt(111)电极一方面抑制了SO42-在电极表面的吸附,另一方面又能在电极表面提供相邻的空位供氧分子吸附.通过与文献中报道的CN-修饰的Pt(111)电极上的氧还原结果的对比,可以推测甘氨酸修饰的Pt(111)电极表面氧还原活性提高,是由于甘氨酸在Pt(111)表面可能先被氧化成CN-后吸附在电极表面,进而促进了氧分子的电催化还原反应.
The electrocatalytic reduction of oxygen molecules on the surface of glycine-modified Pt (111) electrode was investigated by using HMRD in sulfuric acid and perchloric acid solution respectively. The experimental results show that in the presence of In the sulfuric acid solution, the oxygen reduction activity of the glycine modified Pt (111) electrode surface was significantly improved. The half-wave potential of the oxygen reduction was shifted by about 0.1 V from that of the Pt (111) electrode, whereas in the perchloric acid solution , The activity of glycine modified Pt (111) electrode hardly changed.The experimental results show that glycine modified Pt (111) electrode can inhibit the adsorption of SO42- on the one hand and the electrode on the other hand Adjacent vacancy Oxygen molecular adsorption By comparing with the oxygen reduction results reported on the CN-modified Pt (111) electrode reported in the literature, it can be inferred that the oxygen reduction activity of the glycine modified Pt (111) electrode surface is increased due to Glycine on Pt (111) surface may be first oxidized to CN- and then adsorbed on the electrode surface, thus promoting the electrocatalytic reduction of oxygen molecules.