Heteroatom-doped Carbon Nanostructures as Catalysts for Electrochemical Halogen Production Technologies
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Date
2019-03
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Abstract
Hydrochloric acid electrolysis is a widely used chlorine manufacturing process. The energy requirements of HCl electrolysis can be significantly reduced by replacing the traditional H2-evolving cathode with an oxygen depolarized cathode (ODC). Successful operation of this technology requires good ORR characteristics of ODC catalysts, along with high resistance to poisoning in the presence of Cl- anions. State-of-the-art ORR catalyst, namely Pt/C, is highly susceptible to poisoning in the presence of Cl-. Alternative precious metal catalysts such as RhxSy/C demonstrate somewhat higher Cl- poisoning resistance but the exorbitant cost of Rh limits its economic viability. We have evaluated the use of nitrogen-doped carbon nanostructures (CNx) and iron-nitrogen coordinated carbon-supported materials (FeNC) as ODC catalysts by investigating the effect of Cl- exposure on the ORR activity of these materials. Interestingly, while Pt/C, RhxSy/C and FeNC catalysts show a loss in ORR activity, the activity of CNx significantly improves after exposure to Cl- anions. A combination of electrochemical measurements and spectroscopic characterization is used to fundamentally investigate this enhancement in ORR activity of CNx.
Description
Poster Division: Engineering: 2nd Place (The Ohio State University Edward F. Hayes Graduate Research Forum)
Keywords
Chlorine, Carbon nanostructures, Doping, Oxygen reduction reaction, Electrolysis
Citation
Jain, D., Mamtani, K., Gustin, V., Gunduz, S., Celik, G., Waluyo, I., Hunt, A., Co, A.C. and Ozkan, U.S., 2018. Enhancement in Oxygen Reduction Reaction Activity of Nitrogen‐Doped Carbon Nanostructures in Acidic Media through Chloride‐Ion Exposure. ChemElectroChem, 5(14), pp.1966-1975.
Mamtani, K., Jain, D., Co, A.C. and Ozkan, U.S., 2017. Investigation of Chloride Poisoning Resistance for Nitrogen-Doped Carbon Nanostructures as Oxygen Depolarized Cathode Catalysts in Acidic Media. Catalysis Letters, 147(12), pp.2903-2909.
Mamtani, K., Jain, D., Co, A.C. and Ozkan, U.S., 2017. Investigation of Chloride Poisoning Resistance for Nitrogen-Doped Carbon Nanostructures as Oxygen Depolarized Cathode Catalysts in Acidic Media. Catalysis Letters, 147(12), pp.2903-2909.