The relationship between the structure and electrocatalytic properties of TiO2 electrodes doped with CeO2

Abstract

This paper describes the study of the preparation of Ti/Ti 1Àx Ce x O 2 electrodes using the Pechini method and their application for the electroreduction of nitrobenzene in aqueous acid medium. The electrodes were studied using X-ray diffraction, and scanning electron microscopy and it was found that the electrocatalytic properties are influenced by the microstructure and morphology of the electrodes. All doped electrodes presented an enhanced performance for nitrobenzene electroreduction when compared to pure TiO 2 . The Ti 0.995 Ce 0.005 O 2 electrode presented the best performance, with an increase of 58% in the aniline yield under galvanostatic electrolysis conditions.

Behaviour of Ti electrode in the amperometric determination of high concentrations of strong oxidising species

“…In preliminary experiments, different metals were selected on the basis of inertness, electronic properties and (electro)catalytic behaviour [4]. Ti has been rarely employed in amperometric electroanalysis [5], and in most cases, the use has been limited to low concentrations; we could not find investigations on strong oxidants at high concentrations. Our work is focused on two widely employed strong oxidising species, namely, H 2 O 2 and HClO, over a wide concentration range.…”

Electro-Reduction of Nitrobenzene at Titanium Cathode in SDS Aqueous Micellar Solution

“…All doped electrodes presented an enhanced performance for nitrobenzene electroreduction when compared to pure titanium dioxide. 3 The electro-reduction of nitrobenzene in deoxygenated acid solution generates predominantly either paminophenol or aniline via the common electrochemically generated intermediate, phenylhydroxylamine. The electrode is depolarized under periodic current control, which results in lower rates of undesired electrochemical reactions with a consequential increase in chemical product selectivity.…”

Synthesis and Characterization of Nanoscale Ce(x)Ru(1−x)O2 Coatings With Electrochemical Activity

“…A typical DSA consists of a metallic substrate with a ceramic coating with a basic composition of RuO 2 (or IrO 2 ) and TiO 2 , in which RuO 2 (or IrO 2 ) confers the catalytic properties and TiO 2 is responsible for the mechanical and chemical stabilities 6 . During the typical compositions of DSA, the valve metal oxides were selected to have a crystal structure similar to the noble metal oxide to minimize the stress during sintering such as RuO 2 +TiO 2 , 1,6–8 IrO 2 +TiO 2 , 1 IrO 2 +Ta 2 O 5 , 4 RuO 2 +Ta 2 O 5 , 9 RuO 2 +SnO 2 , 10 IrO 2 +SnO 2 , 11,12 and TiO 2 +CeO 2 13 …”