The effect of non-Faradaic electrochemical modification of catalytic activity (NEMCA) was investigated for the case of C2H4 oxidation on a Pt polycrystalline catalyst film also acting as a working electrode in a galvanic cell of the type:
In addition to proton conduction, CaZr0.9In0.1O3-α is known to exhibit oxygen and hole conduction. Proton conduction predominates over the temperature range, 380 to 460 °C, of the present investigation.
It was found that negative current application, i.e. proton supply to the Pt catalyst film causes up to 500% reversible enhancement to the rate of C2H4 oxidation. The catalytic rate increase is up to 20,000 higher than the rate, -I/F, of proton supply to the catalyst. The observed phenomena are discussed within the framework of previous electrochemical promotion (NEMCA) studies.
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Makri, M., Buekenhoudt, A., Luyten, J. et al. Non-Faradaic electrochemical modification of the catalytic activity of Pt using a CaZr0.9In0.1O3-α proton conductor. Ionics 2, 282–288 (1996). https://doi.org/10.1007/BF02376035
- Analytical Chemistry
- Catalytic Activity