Tang Jijun, Ou Zhongping, Guo Rui, Fang Yuanyuan, Huang Dong, Zhang Jing, Zhang Jiaoxia, Guo Song, McFarland Frederick M, Kadish Karl M
School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang, 212013 China.
National Demonstration Center for Experimental Materials Science and Engineering Education, Jiangsu University of Science and Technology , Zhenjiang, 212003 China.
Inorg Chem. 2017 Aug 7;56(15):8954-8963. doi: 10.1021/acs.inorgchem.7b00936. Epub 2017 Jul 25.
A cobalt triphenylcorrole (CorCo) was covalently bonded to graphene oxide (GO), and the resulting product, represented as GO-CorCo, was characterized by UV-vis, FT-IR, and micro-Raman spectroscopy as well as by HRTEM, TGA, XRD, XPS, and AFM. The electrocatalytic activity of GO-CorCo toward the oxygen reduction reaction (ORR) was then examined in air-saturated 0.1 M KOH and 0.5 M HSO solutions by cyclic voltammetry and linear sweep voltammetry using a rotating disk electrode and/or a rotating ring-disk electrode. An overall 4-electron reduction of O is obtained in alkaline media while under acidic conditions a 2-electron process is seen. The ORR results thus indicate that covalently bonded GO-CoCor can be used as a selective catalyst for either the 2- or 4-electron reduction of oxygen, the prevailing reaction depending upon the acidity of the solution.
