Catalytic Water Oxidation by a RuII Half Sandwich Complex

다국어 초록 (Multilingual Abstract)

Water splitting is an emerging domain in the sustainable energy system. In this study a half‐sandwich [Ru(η6‐benzene)(hdm)]BF4 [Ru‐hdm] complex (hdm=hydroxydi(pyridine‐2‐yl)methanolate) has been synthesized and characterized through various spectroscopic techniques. The complex [Ru‐hdm] has been employed to investigate the activity towards electrochemical and chemical water oxidation. Efficient generation of O2 through chemical and electrochemical water oxidation (98 % Faradaic efficiency) in deionized water was observed. The formation of insoluble particles of [RuVI=O] and [RuIV=O] species in the reaction mixture and a coating over the surface of the silicone rubber septum has been noticed. The kinetics of chemical water oxidation reveals the 1st order dependency on CAN and catalyst concentration.
A half sandwiched complex [Ru(η6‐benzene)(hdm)]BF4 ([Ru‐hdm]) has been synthesized and employed as an active precatalyst for oxygen evolution reaction (OER). The formation of insoluble particles of [RuVI=O] and [RuIV=O] species were isolated from the reaction mixture. At applied potential +1.8 V vs. SCE in pH 6.6 phosphate buffer with 98 % of Faradaic efficiency.