Hits:

Indexed by:Journal Papers

Date of Publication:2018-09-01

Journal:Journal of Energy Chemistry

Volume:27

Issue:5

Page Number:1402-1408

ISSN No.:20954956

Abstract:Two efficient single-site Ru water oxidation catalysts [Ru(bda)(pic)(Ln)] (bda = 2,2 ?bipyridine-6,6 ?dicarboxylic acid, pic = picoline, L1 = 4,5-bipyridine-2,7-di-tert-butyl-9,9-dimethylxanthene, L2 = 4-pyridine-5-phenyl-2,7-di-tert-butyl-9,9-dimethylxanthene) were only synthesized containing different xanthene ligands at the axial site. These complexes have been thoroughly characterized by spectroscopic (UV–vis, NMR) and electrochemical (CV and DPV) techniques. Kinetic analysis proved that the mechanism of water oxidation comprises the water nucleophilic attack process on high-valence ruthenium species. It is found that the catalyst 1 displayed higher activity than catalyst 2 on water oxidation, caused by the protonation of the axial ligand L1 with a free pyridine. © 2017 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences