Formation of anodic TiO2 nanotube or nanosponge morphology determined by the electrolyte hydrodynamic conditions期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Formation of anodic TiO2 nanotube or nanosponge morphology determined by the electrolyte hydrodynamic conditions

Affiliation:	1. Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó u. 37-47, Budapest H-1094 Hungary;2. Supramolecular and Nanostructured Materials Research Group of the Hungarian Academy of Sciences, Dóm tér 8, Szeged, H-6720,Hungary;3. MTA-SE Molecular Biophysics Research Group, Semmelweis University, Tűzoltó u. 37-47, Budapest, Szeged, Dóm tér 81094 Hungary;1. Botulinum Research Center, Institute of Advanced Sciences, Dartmouth, MA 02747, USA;2. Department of Chemistry and Biochemistry, University of Massachusetts, Dartmouth, MA 02747, USA

Abstract:	The present work studies the effect of hydrodynamic conditions on the growth of anodic TiO₂ nanostructures on Ti in a glycerol/water/NH₄F electrolyte. Parameter screening for fluoride content, anodization voltage and rotation rate (Reynolds number) of a rotating anode showed that two distinctly different TiO₂ morphologies could be obtained: the classic ordered nanotubes or a nanoscale sponge layer. We present conditions for TiO₂ sponge formation and growth to several micrometers of thickness, and show that in specific cases sponge layers can be superior to tube morphologies, as illustrated for photoelectrochemical water-splitting under standard AM 1.5 conditions.

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