Manganese dioxide as a cathode catalyst for a direct alcohol or sodium borohydride fuel cell with a flowing alkaline electrolyte |
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| Affiliation: | 1. School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China;2. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;1. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102, USA;2. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-2115, USA;3. Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620990, Russia;1. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;1. Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa;2. Energy Materials, Materials Science and Manufacturing, Council for Scientific & Industrial Research (CSIR), Pretoria 0001, South Africa;1. Petrochemical Research Chair, Department of Chemistry, College of science, King Saud University, Riyadh 11451, Saudi Arabia;2. Department of Chemistry, Faculty of science, Tanta University, Tanta 31527, Egypt;3. Organic Materials and Fiber Engineering Department, College of Engineering, Chonbuk National University, Jeonju, South Korea;4. Minia University, faculty of Engineering, Chemical Engineering Department, El Minia, Egypt |
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| Abstract: | The oxygen reduction reaction at a manganese dioxide cathode in alkaline medium is studied using cyclic voltammetry and by measuring volume of oxygen consumed at the cathode. The performance of the manganese dioxide cathode is also determined in the presence of fuel and an alkali mixture with a standard Pt/Ni anode in a flowing alkaline-electrolyte fuel cell. The fuels tested are methanol, ethanol and sodium borohydride (1 M), while 3 M KOH is used as the electrolyte. The performance of the fuel cell is measured in terms of open-circuit voltage and current–potential characteristics. A single peak in the cyclic voltammogram suggests that a four-electron pathway mechanism prevails during oxygen reduction. This is substantiated by calculating the number of electrons involved per molecule of oxygen that are reacted at the MnO2 cathode from the oxygen consumption data for different fuels. The results show that the power density of the fuel cell increases with increase in MnO2 loading to a certain limit but then decreases with further loading. The maximum power density is obtained at 3 mg cm?2 of MnO2 for each of the three different fuels. |
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