2020年1月24日 · The oxidized platinum (Pt) can exhibit better electrocatalytic activity than metallic Pt0 in the hydrogen evolution reaction (HER), which has aroused great interest in exploring the role of...

2022年4月7日 · X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure spectroscopy (EXAFS) and XPS analysis provide the information of the electronic states of Pt atoms in the catalysts.

2022年5月4日 · XPS and XAS results demonstrate that the obtained Pt ACs are in a low oxidation state, which is beneficial for hydrogen generation.

2019年5月1日 · X-ray photoelectron spectroscopy (XPS) was carried out on an ESCALAB 250Xi system equipped with monochromatic Al Kα X-rays to investigate the surface compositions and oxidation states of the elements.

2003年8月1日 · XPS results revealed an increased formation of a highly oxidized Pt species over sulfated 1%Pt/γ-Al 2 O 3 that suggests that the promoting effect on the propane combustion is due to the interaction of surface sulfates with surface highly oxidized Pt atoms that can be ascribed to Pt 4+ at the edge of the Pt particles.

XPS Spectra Platinum (Pt) Compounds The XPS Spectra section provides raw and processed survey spectra, chemical state spectra, BE values, FWHM values, and overlays of key spectra. Atom% values from surveys are based on sample, as received, and Scofield cross-sections. Atom% values are corrected for IMFP and PE.

Pt 4f XPS spectra showed Pt 0 content is much higher than Pt 2+ (Table S4). ... A special core–shell structure catalyst is designed, synthesized and tested in a fuel cell by a simple process of...

The effect of coating TiO2 on the CO oxidation of the Pt/γ-alumina catalysts was observed through activity tests and surface characterization spectroscopy by X-ray photoelectron spectroscopy (XPS...

1988年6月1日 · The stabilization of Pt in the higher oxidation state is attributed to a Pt-A1203 interaction, in which Pt is stabilized in an oxidized state. Thus, XPS can distinguish between the dispersed and the particulate phases of Pt on alumina by the BE shift of a sample which has been reduced by hydrogen at 150 C for 1 h.

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