Influence of chemical composition and amount of intermixed ionomer in the catalyst on the oxygen reduction reaction characteristics
| DOI | 10.1007/s10008-017-3521-7 |
|---|---|
| Year | 2017 |
| Publisher | Springer-Verlag |
| Journal | Journal of Solid State Electrochemistry |
| Volume | 21 |
| Number | 7 |
| Pages | 2079-2090 |
| Type | article in journal |
| Estonian author | |
| Language | English |
| Id | 24739 |
Abstract
Influence of chemical composition of the ionomers (polyvinyl alcohol (PVA) or Nafion®) on the oxygen reduction reaction (ORR) kinetics has been studied. The 5 wt% Nafion-Vulcan showed higher electrochemical activity toward ORR compared with that for the 5 wt% PVA-Vulcan. Four different Nafion® amounts were used to intermixing a carbide-derived carbon (CDC) or Pt-modified CDC catalysts and the highest electrochemical activity toward ORR was established for the 30 wt% Nafion-Pt/CDC catalyst. Influence of the different amounts of Nafion® ionomer in the catalyst is moderate compared to the effect of variation of the carbon support (Vulcan vs. CDC) or the ionomer (PVA vs. Nafion®). The Randles–Ševcik relationship was used to estimate the effective electrochemical active surface area (Seff) of the electrodes, depending on the chemical composition of the ionomer studied.