Comparison of Chemically Synthesized TiO2 Nanotube in Different Base Concentration for Oxygen Evolution Reaction (OER) application

کد مقاله : 1021-CNF

نویسندگان

پردیس نادراصلی *1، محمد ژیانی2، محمد محمدی3، هایده بلالی دهکردی4 1دانشگله صنعتی اصفهان 2تربیت مدرس 3انجمن 4دانشگاه صنعتی اصفهان

چکیده مقاله

TiO2, which shows excellent physical and chemical stability in harsh condition of anions’ attack and large potential, can be used as OER catalyst’s support. There are many methods for the preparation of large-surface-area (thus high-activity) TiO2, such as the “Hydrothermal method”, “Nanoparticle preparation”, and “Electrochemical anodization”. In this research, the focus is on “Hydrothermal method”. Hydrothermal technique is an important tool for advanced nanostructural material processing and defined as any heterogeneous chemical reaction in the presence of an aqueous solvent above room temperature and at a pressure greater than 1 atm in a closed system. The hydrothermal synthesis covers the process of crystal growth, crystal transformation, phase equilibrium, and finally leads to fine to ultra-fine crystals. In hydrothermal treatment of titanium dioxide various bases (NaOH, KOH) was used to prepare nanostructures. The research shows that the formation of TiO2 is largely dependent on the type and concentration of a base. Nanostructures were investigated using Scanning Electron Microscopy (SEM) and Electrochemical activities. SEM shows that TiO2 treated with 18 M of KOH at 150 ℃ has more nanotube structure than TiO2 treated with 1 M of NaOH at 120 ℃. The higher the concentration and bigger the cation of the base get, the higher the roughness of the TiO2 gets. LSV curves of OER shows that treating TiO2 with base would lead to a better catalytical activity than un-treated TiO2 P25. This could help the catalyst activity.

کلیدواژه ها

OER, TiO2 nanotube, Catalyst support, Hydrothermal TNT.

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