Coulometric determination of dissolved hydrogen with a multielectrolytic modified carbon felt electrode-based sensor

• Published in: Journal of environmental sciences (China) Vol. 25; no. 6; pp. 1077 - 1082
• Main Authors: Matsuura, Hiroaki, Yamawaki, Yosuke, Sasaki, Kosuke, Uchiyama, Shunichi
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.06.2013
• Subjects: Anodizing; aqueous solutions; Carbon; Carbon - chemistry; Carbon Fiber; catalytic activity; Coulometers; coulometric determination; Dissolution; dissolved hydrogen; Electric charge; Electrochemistry - methods; Electrodes; hydrogen; Hydrogen - chemistry; Hydrogen storage; multielectrolytic modified carbon electrode (MEMCE); nitrogen; oxidation; Reduction (electrolytic); sulfuric acid; 修饰; 库仑法; 氢分子; 氨基甲酸铵; 测定; 溶解氢; 电极传感器; 碳毡电极; multielectrolytic modified carbon electrode (MEMCE); coulometric determination; dissolved hydrogen
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(12)60130-2

A multielectrolytic modified carbon electrode (MEMCE) was fabricated by the electrolytic-oxidation/reduction processes. First, the functional groups containing nitrogen atoms such as amino group were introduced by the electrode oxidation of carbon felt electrode in an ammonium carbamate aqueous solution, and next, this electrode was electroreduced in sulfuric acid. The redox waves between hydrogen ion and hydrogen molecule at highly positive potential range appeared in the cyclic voltammogram obtained by MEMCE. A coulometric cell using MEMCE with a catalytic activity of electrooxidation of hydrogen molecule was constructed and was used for the measurement of dissolved hydrogen. The typical current vs. time curve was obtained by the repetitive measurement of the dissolved hydrogen. These curves indicated that the measurement of dissolved hydrogen was finished completely in a very short time (ca. 10 sec). A linear relationship was obtained between the electrical charge needed for the electrooxidation process of hydrogen molecule and dissolved hydrogen concentration. This indicates that the developed coulometric method can be used for the determination of the dissolved hydrogen concentration.