Activity of oxygen reduction reaction on small amount of amorphous CeO promoted Pt cathode for fuel cell application

Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

“…It is very clear that there is an extrusive relation between cathodic current values and the rate of electrode rotation. The studied catalyst samples show the same ORR open circuit potential (around 1040 mV for Pt-CeO 2 /C-1 and around 1080 mV for Pt-CeO 2 /C), generally this is in consistent with the expected behavior for ORR in aqueous acid medium catalyzed by Pt nanoparticles on carbon supports [60]. The increase in the diffusion limiting current in the RDE measurement is directly proportional to the rotation speed.…”

“…-2 ) at the same potential value as seen in Table 4, this could be interpreted in the light of the fact that; Pt-CeO x appears to have a characteristic system when compared to other Pt−oxide composite catalysts; the active oxygen supplied from CeO 2 to Pt surface contributed to the improvement of the ORR activity of the PtCeO x cathode, so this noticed behaviour of high ORR activity of Pt-CeO 2 /C may be improved by formation of Pt surface partially covered by amorphous Ce 2 O 3 layer or may be due to the role of ceria layer in Pt oxide formation on Pt [60].…”

Role of Cerium Oxide in the Enhancement of Activity for the Oxygen Reduction Reaction at Pt–CeOxNanocomposite Electrocatalyst - An in Situ Electrochemical X-ray Absorption Fine Structure Study

“…Pt−CeO x /C was synthesized by a combined process of precipitation and coimpregnation methods, as reported previously. 17,28,29 A 5 μL portion of an aqueous dispersion containing 20 wt % Pt/C or Pt−CeO x /C was drop-cast on glassy carbon (Tokai Carbon) and then dried in an oven at 60°C for 1 h. Prior to each experiment, the electrode surface was cleaned by an oxidation reduction cycle (ORC) between −0.2 and +1.3 V in 0.5 M H 2 SO 4 solution saturated with nitrogen. Pt−CeO x nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), as reported in the previous paper.…”

RuO2Nanosheet Modified Pt3Co/C Cathode: Mitigating Activity Loss at High Temperature and High Potential Conditions

“…Oxide additives such as TiO 2 , 33,34 SiO 2 , 35,36 CeO 2 , 37 and WO 3 , 34 have been shown to inhibit particle growth and/or dissolution of the catalyst. For example, TiO 2 -Pt/C exhibited higher durability compared to Pt/C, which was attributed to the suppression of the aggregation of Pt nanoparticles.…”

“…33,34 Similarly, particle growth and sintering of Pt nanoparticles was suppressed for Pt-CeO x /C composite catalyst. 37 Although these are effective cocatalysts, one must take into consideration that the co-catalysts are poor electronic conductors and care must be taken so that the oxide additive does not cover or block the metal surface, which would result in loss of accessible surface area.…”