Other Binary Oxides

Entry number Oxide semiconductor Energy band gap, eV Comments Refer- ence(s) 

1 wos 2.5—2.8 This material has been used as single crystals, thin films, powders and in mesoporous/ nanostructured form. Both virgin and doped samples studied. 339-350 

4 Sn02 3.5 Sb-doped single crystal samples used. Stable H2 and O2 evolution observed at Pt cathode and Sn02 photoanode respectively. 369,370 

5 NiO 3.47 A p-type semiconductor with indirect gap optical transition. 371,372 

6 CdO -2.3 A n-type semiconductor. Interestingly, Ru02-modified samples reduced the yield of O2 under irradiation. 373 

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Earlier, we considered the structure of non-stoichiometric FeO in some detail. If we apply the same principle to other binary oxides, we can define four types of compound ... 

For several other binary oxide catalysts, this type of bifunctionality is indicated by the fact that both cations are partially reduced under reaction conditions, as observed by ESCA and y resonance techniques. An example of a catalyst investigated is FeMo04 [75]. 

Table 8 contains a compilation of studies on other binary oxides that have been examined for their applicability to drive the photoelectrolysis of water. As cited earlier, general reviews are available on many of the oxides listed in Table 8.32,62,65 Other than Ti02, Fe203 and WO3 are two of the most widely studied among the binary oxide semiconductors, and studies on these oxides have continued to appear right up to the time of the writing of this Chapter.

Another transition metal oxide used as the electrode material in XO, sensors is Cr2O3 [275-281]. Other binary oxides used for XO,. sensors include ZnO [264], V2O5 [282], and SnO2 [278, 279], which has also been used for CO sensors [283]. Indium oxide (In2O3) has been used in a CO sensor and tested in engine exhaust gas [284]. Oxides used as electrodes in sensors for hydrocarbons include Ga2O3 [285],... 

Besides pure aluminas, other materials like doped aluminas, siliea-aluminas and other binary oxides as well as pure oxides, e.g. magnesium oxide, can be manufactured. Pilot-and semi-commercial production capabilities help to shorten product development cycles and give a high degree of security to the catalyst manufacturer and a faster response to his developmental needs. 

The only other binary oxide of plutonium of practical importance is the peroxide, which is the basis of a process for the purification of plutonium and its conversion to the metal. Addition of H2O2 to an aqueous plutonium solution first converts plutonium ions to the tetravalent state. 

Other binary oxides containing Si02 Silica-iron oxide possesses maximum acid sites at the... 

D. Structural and Quantum Chemical Studies for Acid Sites on Binary Oxides The structures of acid sites on binary oxides have been proposed exclusively for SiOz —AI2O3, and the acid site structure of SiOz —AI2O3 was applied to other binary oxides with some modification according to the coordination numbers and valences of the metal cations. The first proposal for the acid site structure was made by Hans-ford, as shown below. 

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