Phosphorus Doping on FeNC and CNx Catalysts in Oxygen Reduction Reaction in PEM Acidic Media
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Date
2016-05
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The Ohio State University
Abstract
Fuel cells catalysts are being researched to achieve higher activity and lower costs for oxygen reduction reaction. Iron nitrogen carbon (FeNC) and nitrogen carbon (CNx) catalysts hold promising potential for being catalytically active at low costs. Phosphorus was doped on both FeNC and CNx catalysts to improve activity because of phosphorus’ elemental properties. The specific amount of phosphorus doping was also researched for activity optimization. Triphenylphosphine was used as a phosphorus dopant and incorporated in the ballmilling step for both FeNC and CNx synthesis. Activity testing using Rotating Disk Electrode (RDE) apparatus with glassy carbon working electrode was done on both FeNC and CNx catalysts with and without P-doping. The CV curves obtained from the testing in phosphoric acid acidic mediums were analyzed via onset or half-wave potentials to determine the catalytic activities. The results showed that P-doping did not positively affect the activity of FeNC but did positively affect the activity of CNx. The results suggest the different effectiveness of P-doping on different carbon structured catalysts.
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Keywords
Catalysis, Fuel Cell, Activity, PEM, Oxygen Reduction Reaction