Electrochemically oxidized carbon anode in direct l-ascorbic acid fuel cells |
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Authors: | Sunghyun Uhm Jinsub Choi Jaeyoung Lee |
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Affiliation: | a Department of Chemical Engineering, Inha University, Incheon 402-751, Republic of Korea b Department of Environmental Science and Engineering, GIST, Gwangju 500-712, Republic of Korea c Nanomaterials Application Division, Korea Institute of Ceramic Engineering and Technology, Seoul 153-801 Republic of Korea |
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Abstract: | The activity of electrochemically oxidized carbon electrode was investigated in the operation of a direct l-ascorbic acid fuel cell anode. The surface oxygen species placed on electrochemically oxidized carbon electrode were analyzed by X-ray photoelectron spectroscopy and cyclic voltammetry. The electrochemical oxidation process of carbon electrode can facilitate the pore-filling process (i.e., wetting) of the electrolyte into the microstructure of the carbon electrode by increasing the number of more polar functional groups on the electrode surface. The electrochemically oxidized carbon electrode exhibited significantly enhanced electro-catalytic oxidation activity of l-ascorbic acid compared to an unmodified carbon electrode. Moreover, the simplified electrode structure using carbon paper without an additional powder-based precious catalyst layer is very favorable in creating percolation network and generates power density of 18 mW/cm2 at 60 °C. |
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Keywords: | l-Ascorbic acid" target="_blank">l-Ascorbic acid Electro-oxidation treatment Carbon paper electrode Fuel cell performance Percolation network |
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