Pt–CeO thin film catalysts for PEMFC

In-situ electrochemical atomic force microscopy study of aging of magnetron sputtered Pt-Co nanoalloy thin films during accelerated degradation test

“…In our previous studies we have showed that simultaneous magnetron sputtering of Pt and Co leads to the formation of Pt-Co alloy catalyst film [18,19]. Moreover, we have successfully demonstrated a high mass activity and excellent stability of such thin film catalyst in PEMFC [20]. Despite improvements in ORR activity, binary alloy catalysts are thermodynamically unstable and transition metals were found to dissolve in the acidic fuel cell environment, which leads to catalyst dealloying followed by a decrease of its activity during operation [10,11].…”

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

“…The surface of the Pt-CeO 2 films was investigated by means of high-resolution transmission electron microscopy (HRTEM). There, the Pt-CeO 2 nanoparticles terminated by the {111} and {100} facets were identified in the Pt-CeO 2 films supported on CNT-coated GDL, 42,43 n-GDL, 41,44 and silicon wafers. 42,63 Typical HRTEM images obtained from the Pt-CeO 2 films supported on n-GDL are shown in Fig.…”

“…43 However, the highest PD and SP were obtained with the Pt-CeO 2 catalyst deposited on carbon nanoparticle coated GDL (nanoGDL, also n-GDL). 21,41,44 The information depth achieved with these techniques increases with increasing photon energies (hν) and cosIJα) with respect to the surface normal from 0.5 nm (SRPES) and 1-2 nm (AR XPS) to 7 nm (HAXPS). The corresponding Pt 4f spectra obtained from the Pt-CeO 2 thin films with SRPES, AR XPS, and HAXPS are shown in Fig.…”

“…21,[39][40][41][42][43][44] The key parameter determining the cost efficiency of the fuel cell catalyst is the specific power (SP), i.e. the power density (PD) per weight of noble metal.…”

Structural and Chemical Characterization of Cerium Oxide Thin Layers Grown on Silicon Substrate

“…Before the study of Pt-doped ceria thin films grown on silicon substrate interesting for fuel cells applications [22], this study aims at characterization of undoped ceria thin films to obtain references before studying the effect of Pt co-deposition. Coating morphology observations, crystallographic structures determination, elemental chemical analyses and cerium oxidation states determination by EELS measurements have been performed.…”