Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The oxygen evolution reaction1 and the CO2 electroreduction2 are two key energy conversion reactions. Combining these two catalytic reactions may enable technologies that can produce carbon-neutral fuels and/or commodity chemicals when coupled to renewable energy sources.3 For the cost-effective realization of this challenge, oxygen evolving catalysts need to be developed that are based on abundant transition metals and work at near-neutral pH. Yet during the last years, the emphasis of systematic studies on the activity of oxygen evolving catalysts has been the basic pH regime. Herein, an electrochemical benchmarking of singular, binary and ternary composite oxides based on Co, Mn, and Fe will be presented. The catalysts are synthesized by photochemical metal-organic deposition4, having a composition of Co100-y-zMnyFezOx (y, z=0-100). We report new insights in the performance of electrochemical water oxidation at pH 7 in potassium phosphate buffer. For the electrochemical reduction of CO2, highly porous and dendritic materials5 based on Cu/CuOx are investigated, which are prepared by electrodeposition under continuous H2 formation.
1. Dau, H., et al., The mechanism of water oxidation: from electrolysis via homogeneous to biological catalysis. ChemCatChem, 2010. 2(7): p. 724-761.
2. Hori, Y., Electrochemical CO2 Reduction on Metal Electrodes, in Modern Aspects of Electrochemistry, C.G. Vayenas, R.E. White, and M.E. Gamboa-Aldeco, Editors. 2008, Springer New York: New York, NY. p. 89-189.
3. Chen, Z., et al., Splitting CO2 into CO and O2 by a single catalyst. Proceedings of the National Academy of Sciences, 2012. 109(39): p. 15606-15611.
4. Smith, R.D.L., et al., Photochemical Route for Accessing Amorphous Metal Oxide Materials for Water Oxidation Catalysis. Science, 2013. 340(6128): p. 60-63.
5. Shin, H.C., J. Dong, and M. Liu, Nanoporous Structures Prepared by an Electrochemical Deposition Process. Advanced Materials, 2003. 15(19): p. 1610-1614.
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