Shi Hua-Tian, Li Xiu-Xiu, Wu Fang-Hui, Yu Wei-Bin
Analysis and Testing Central Facility, Engineering Research Institute, Anhui University of Technology, Maanshan 243002, P. R. China.
Dalton Trans. 2017 Nov 28;46(46):16321-16326. doi: 10.1039/c7dt03653a.
The development of an earth-abundant, first-row water oxidation catalyst that operates at a high TOF and a low overpotential remains a fundamental chemical challenge. Cobalt complexes are important members of water oxidation catalysts. Herein, we report a cobalt-based robust homogeneous water oxidation catalyst, which can electrocatalyze water oxidation at a high pH and a low overpotential (η = 520 mV) in phosphate buffer. This homogeneous system exhibits a high turnover frequency (about 5 s) of catalyzing water oxidation to produce oxygen at η = 720 mV. We speculate the mechanism of the reaction that O-O bond formation prefers a HO-OH coupling in catalytic water oxidation.
开发一种储量丰富的第一排元素水氧化催化剂，使其在高周转频率（TOF）和低过电位下运行，仍然是一项基本的化学挑战。钴配合物是水氧化催化剂的重要成员。在此，我们报道了一种基于钴的稳健均相水氧化催化剂，它可以在磷酸盐缓冲液中，于高pH值和低过电位（η = 520 mV）下电催化水氧化。该均相体系在η = 720 mV时表现出催化水氧化产生氧气的高周转频率（约5 s⁻¹）。我们推测了该反应的机理，即在催化水氧化过程中，O - O键的形成更倾向于HO - OH偶联。
