Enhanced Electricity Generation from Electrochemical Oxidation of FeII in an Air鈥揅athode Fuel Cell Amended with Chelating Anions

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• 作者：Lin-Feng Zhai ; Zhong-Hua Tong ; Min Sun ; Wei Song ; Shan Jin ; Hideki Harada
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：52
• 期：6
• 页码：2234-2240
• 全文大小：400K
• 年卷期：v.52,no.6(February 13, 2013)
• ISSN：1520-5045

文摘

The air鈥揷athode fuel cell approach is promising for ferrous (Fe^II) ion removal from acid mine drainage because iron and electricity are simultaneously recovered in the treating process. Here we show that electricity generation from Fe^II can be enhanced by amending chelating anions to facilitate Fe^II oxidation at the anode of the fuel cell. A series of Fe^II-fed fuel cells were operated with various chelating anions, including carboxylate, phosphate, and borate ligands. The average power densities of these fuel cells varied over a wide range from 0.08 卤 0.5 to 107.85 卤 1.50 mW m^鈥?. Citrate-amended fuel cells operated at pH 8鈥? and carbonate-amended fuel cells operated at pH 6鈥? exhibited greater charge-recovery efficiencies than others, which ranged from 93.5% to 96.1%. The redox potential of an anodic solution and redox activity of Fe^II were two important factors affecting the electrooxidation of Fe^II in fuel cells.