Deposition of thin TiO2 layers on platinum by means of cyclic voltammetry of selected complex Ti(IV) media leading to anatase

Electrosynthesized TiO2 films: dependence of the brookite–anatase ratio on the applied potential

“…Furthermore, as the concentration of OH -ions grows, the fraction of brookite in the sample decreases, indicating its dependence on the local pH at the substrate/electrolyte interface during electrosynthesis. The correlation between pH and crystalline structure suggested here is in accordance with previous works reporting TiO 2 synthesis by sol-gel method that indicate that anatase is favored in detriment of brookite and rutile for higher pH synthesis conditions [4]. This result would be derived from the similar mechanisms of both methods concerning the formation of the material.…”

“…We have observed the coexistence of brookite and anatase polymorphs [1]. Nevertheless, the influence of current and/ or applied potential on the crystalline structure of electrosynthesized TiO 2 was not yet investigated, to our knowledge.…”

“…Both are wet chemical routes for TiO 2 synthesis, thus favoring the formation of metastable polymorphs (i.e., anatase, brookite), in proportions that are strongly dependent on the synthesis variables [4]. However, ES allows fine-tuning of processing variables such as current and applied potential.…”

“…However, ES allows fine-tuning of processing variables such as current and applied potential. Furthermore, once the electrosynthesized material grows from the substrate, TiO 2 can be molded, resulting in films [2,9,12] and nanowires [11], for example. To obtain crystalline TiO 2 , two steps are required: (i) electrosynthesis, which provides an amorphous gel, and (ii) thermal treatment (TT), which crystallizes the amorphous gel [9,23].…”

Novel, Highly Conductive Pt/TiO2 Thin‐Film Model Catalyst Electrodes: The Role of Metal–Support Interactions

“…[17;18] In this work we used electrodeposition of TiO2 on a conducting substrate such as glassy carbon or indium doped tin oxide (ITO), to fabricate TiO2 films of controlled thickness, in the range of about 100 nm (for details see section 3.1 and ref. [19] ). For the subsequent functionalization by deposition of Pt nanoparticles different procedures were tested, including the deposition of preformed unsupported Pt nanoparticles from an aqueous suspension [20] , the electrodeposition from Pt 4+ salt containing electrolyte [21][22][23] and photo-assisted Pt deposition, [24] in order to possibly modify the metal−support interaction.…”