Electrochemical corrosion of platinum electrode in concentrated sulfuric acid

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• 作者：Fumihiro Kodera ; Yu Kuwahara ; Akira Nakazawa ; Minoru Umeda
• 关键词：Concentrated sulfuric acid ; Platinum electrode ; Electrochemical corrosion ; Sulfur deposition ; Successive potential sweep
• 刊名：Journal of Power Sources
• 出版年：2007
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：25 October 2007
• 卷：172
• 期：2
• 页码：698-703
• 文件大小：2101 K

摘要

We report on the electrochemical corrosion of a Pt electrode in strong sulfuric acid. The electrochemical measurements were conducted using a Pt-flag working electrode, Ag/Ag₂SO₄ reference electrode and Pt counter electrode at 25 °C. The measured cyclic voltammograms significantly changed in the H₂SO₄ concentration range of 0.5–18 mol dm⁻³, especially from 14 to 18 mol dm⁻³. After successive potential sweeps for 15 h in 16 mol dm⁻³ H₂SO₄, a weight loss of the Pt-flag electrode was realized. In contrast, a controlled potential electrolysis by cathodic polarization caused a weight gain, which was attributed to sulfur deposition by the H₂SO₄ reduction. The subsequent anodic polarization produced corrosion of the deposited sulfur. Consequently, the alternating polarization generated platinum corrosion, resulted in the production of platinum and sulfur composite particulates in the solution.