Journal
CHEMELECTROCHEM
Volume 8, Issue 12, Pages 2221-2230Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202100364
Keywords
ruthenium(IV)-oxo complexes; electrocatalysis; water oxidation; pyridyl ligand; coordination chemistry
Categories
Funding
- Innovation and Technology Commission
- Hong Kong Polytechnic University
- Patrick S.C. Poon endowed professorship
Ask authors/readers for more resources
The study reveals that ligands with longer alkyl chains can effectively promote the conversion of Ru-III-OH to Ru-IV=O, and the presence of perchlorate anions can further enhance this conversion. Additionally, the alkyl chain on the ligands also helps promote the adsorption of ruthenium complexes on the electrode surface.
Electro-generation of Ru-IV=O species from the Ru-II-aqua complex is a crucial step to excel the electrocatalytic water oxidation performance of ruthenium oxo complexes. We report herein the synthesis and X-ray crystal structural characterizations of new Ru-II-aqua complexes containing N-substituted 2,2 '-dipyridylamine ligands (L) tagged with an alkyl chain of various lengths, [Ru(tpy)(L)(OH2)](2+). Cyclic voltammetric analyses show that the length of the alkyl chain exerts great influence on the electro-generation of Ru-IV=O species. The L with a longer alkyl chain in an acidic aqueous medium promotes the conversion of Ru-III-OH to Ru-IV=O efficiently. Surprisingly, this conversion can be further enhanced by the presence of perchlorate anions. Chronocoulometric data reveal that the alkyl chain on L promotes the adsorption of the ruthenium complex on the electrode surface. Bulk electrolysis results indicate that the [Ru(tpy)(dppa)(OH2)](2+) (dppa=(2,2 '-dipyridyl)-n-propylamine) gives the most active electrocatalytic water oxidation activity among the ruthenium-aqua complexes investigated in this study.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available