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• W2492756503 abstract "I. B. RUFUS*,V. RAMAKRISHNAN, B. VISWANATHAN, J. C. KURIACOSE Department of Chemistry, Indian Institute of Technology, Madras 600036, India Metallized CdS is used as a photocatalyst for many reactions and as a photoanode in photoelectrochem- ical (PEC) cells [1-4]. Conversion and storage of solar energy can be achieved by means of photocata- lysis as well as by PEC cells. The photocatalytic and photoelectrochemical properties of metallized CdS depend on its surface properties. Pd/CdS is a better photocatalyst and photoanode than CdS [3]. However, a detailed surface study of Pd/CdS is lacking. X-ray photoelectron spectroscopy (XPS) is a versatile tool to probe the surface of materials. XPS investigation of Pd/CdS will yield useful infor- mation such as the oxidation state of Pd, the contact between Pd and CdS, and other species present on the surface. Metallized CdS is mostly prepared by the photodeposition of noble metals [1, 3, 4]. There- fore, in the present investigation Pd, one of the representatives of noble metals, was photodeposited on CdS and the Pd/CdS obtained was analysed by XPS. Pd, Pt, Rh, Ru and Ni/CdS were prepared by the simultaneous photodeposition (illuminating for 15 min with a 1000 W tungsten-halogen lamp) of these metals on a sintered (4 h at 873 K in nitrogen) CdS (Fluka, 99.999% purity) pellet from an equi- molar (1 x 10 -4 M) solution (acetic acid, pH 4.5) of the corresponding metal chlorides. Following a similar procedure, Pd was photodeposited from a solution of PdC12 (Arora Mathey Ltd, India). After photodeposition the pellets were washed with triply distilled water and dried in air at room temperature (303 K). The sides of the pellets that were exposed to visible light during the photodeposition were subjected to XPS analysis. The XPS studies were made with an ESCA Lab Mk II (VG Scientific Co., UK) at room temperature and at a pressure of 1 x 10 -7 Pa before and after sputtering with argon ions. The X-ray source used was MgKo~ with an energy of 1253.6 eV. The C ls peak at 285.0 eV was used as the internal standard. In the cases of Pd, Pt, Rh, Ru and Ni/CdS prepared by the simultaneous photodeposition of these metals, the Pd 3d and 3p binding energies (Figs 1 and 2) are higher than those reported for Pd metal, viz. 344.7, 340.0 and 531.5 eV [5], indicating that Pd which is on the surface of CdS is not in the zero oxidation state. The several Pd-O species identified are shown in Table I. Hence, in the case of Pd/CdS the XPS spectra were recorded only after argon-ion sputtering, in order to study the surface free of oxide" @default.
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• W2492756503 date "1993-01-01" @default.
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• W2492756503 title "X-ray p hotoelectron s pectroscopic studies on Pd/CdS" @default.
• W2492756503 hasPublicationYear "1993" @default.
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