Ultra-low loading Pt-sputtered gas diffusion electrodes for oxygen reduction reaction

Influence of the electrocatalyst layer thickness on alkaline DEFC performance

“…Therefore, the thicker ones achieve more power due to more active catalyst sites. 35 Moreover, the electrode resistance values decrease and the current densities at 0.75 V vs. RHE get higher with increasing temperature (only slightly between conditions II and III). The onset potential increases with temperature until condition II, and is nearly the same under condition III for all electrodes.…”

“…By using the electrolyte, the electrode is wetted more effectively and the three phase boundary is established more easily and thus, for example, the ion conduction is better. 21,35…”

“…By using the electrolyte, the electrode is wetted more effectively and the three phase boundary is established more easily and thus, for example, the ion conduction is better. 21,35 In comparison with the MEA2 measurements (same anode catalyst and loading), higher power density values are achieved for condition III, but not for condition I. This can be explained by the use of the different cathode catalysts, Pt/C was used for MEA1-MEA4 and Ag-Mn x O y /C for MEA5-MEA8.…”

“…Compared to conventional rotating disk electrode (RDE) measurements, GDE half-cell measurements show more realistic conditions, due to the presence of a three phase boundary and also the possibility to measure at high currents. 9,32–40 RDE measurements, however, are extremely important for basic fundamental catalyst research, such as the oxidation and reduction processes, and useful by coupling with in situ Fourier-transform infrared spectroscopy (FT-IR) or Raman spectroscopy to study ethanol conversion and intermediates that accumulate on the catalyst. 41–44 The influence of ethanol crossover, which has a large impact, as already described, can be achieved through the measurement of the entire fuel cell.…”

Investigation of Carbon Nanofiber‐supported Electrocatalysts with Ultra‐low Platinum Loading for the Use in PEM Fuel Cells

“…A very important and difficult issue in the fuel cell development was raised regarding the decreasing of the Pt loading. Various studies have focused on platinum content reduction by developing ultra‐low Pt electrodes via various techniques, e.g., sputtering or underpotential deposition . Moreover, a high utilization of platinum particles and a good stability are other important aspects regarding the cell efficiency.…”