کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6469523 | 1423974 | 2017 | 5 صفحه PDF | دانلود رایگان |
- Kinetic isotope effect measured on non-precious metal (Fe-C,N) catalysts for the oxygen reduction reaction.
- Correction made for different equilibrium potentials of oxygen reduction reaction to form D2O and H2O.
- A kinetic isotope effect of ~Â 3.4 is measured in acid suggesting predominantly inner sphere electron transfer.
- A kinetic isotope effect of ~Â 2.5 is measured in alkaline suggesting a contribution from outer sphere transfer.
Heat treated Fe-N/C materials which are highly effective oxygen reduction catalysts in alkaline and acid, show a significant kinetic isotope effect (KIE). The values in acid (~Â 3.4) and alkaline (~Â 2.5) are much larger than the value for the metal free catalyst in acid (~Â 1.8) suggesting that the rate determining step (RDS) is a proton coupled electron transfer in acid with a significant pathway involving a proton independent step under an alkaline environment.
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Journal: Electrochemistry Communications - Volume 83, October 2017, Pages 67-71