Details

Autor(en) / Beteiligte

• Sharif, Hossain Md
• Shen, Xiao-Feng
• Watanabe, Motonori

Titel

The effect of hydrophobicity of ruthenium complex dyes on photocatalytic water electrolysis

Ist Teil von

• Applied physics. A, Materials science & processing, 2024-08, Vol.130 (8), Article 569

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Bis(2,2′-bipyridine)bis(isothiocyanato)ruthenium complexes are organo-metallic dyes having broad absorption properties in the visible region that are widely used in dye-sensitized opto-electronic devices. Here, we report the photocurrent measurement and stability studies of three Ru-complexes, cis -bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)ruthenium(II) ( N3 ), its hydrophobic analogues cis -bis(isothiocyanato)(2,2’-bipyridyl-4,4’-dicarboxylato)(4,4’-di-nonyl-2’-bipyridyl)ruthenium(II) ( Z-907 ) and hydrophilic analogues (di-tetrabutylammonium cis -bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)ruthenium(II), ( N719 ). Z907 shows higher stability and photoelectric conversion efficiency after 2 h analysis than its hydrophilic counter-molecules, N3 and N719 . The Z907 -TiO 2 system exhibited a 1.09 mA/cm 2 photocurrent density after 2 h of analysis, with 78% of its performance retained even after an extended 48 h of analysis. The activity of N719 -TiO 2 and N3 -TiO 2 sharply decreased after 2 h of analysis, and significant desorption of the dye present on titanium oxide was also observed. This study suggests that hydrophobicity at the electrode-dye interface is a major factor supporting the stability of the dye-sensitized photoanode.