The preparation and catalytic performance of MnCo layered double hydroxides/reduced graphene oxide electrode
XING Jia-yu, LI li, ZHANG Guo-quan, YANG Feng-lin
Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
We studied a MnCo layered double hydroxides (LDH) catalyst and loaded it on reduced graphene oxide (rGO) to prepare MnCo-LDH/rGO electrode and investigate its oxygen reduction properties. The MnCo-LDH and MnCo-LDH/rGO exhibited the best outstanding morphology and catalytic performance at the Mn/Co ratio of 1:3. Compared with MnCo-LDH, the MnCo-LDH/rGO illustrated a prominent oxidation-reduction potential (-0.425V) and peak current (0.749mA/cm2). Furthermore, the MnCo-LDH/rGO afforded a Rhodamine dye B(RhB) degradation rate of 98.6% in 120min with a current density of 30mA/cm2, while the initial concentration of RhB was 20mg/L, which exhibited superior degradation performance. The results of Rotating Disk Electrode (RDE) and free radical quenching experiment showed that the number of electrons transferred in the reaction was 2 and the main radical was·OH. In brief, the MnCo-LDH/rGO with low cost, facile synthesis and high catalytic activities for ORR has good potential and application prospect in electrochemical catalysis.
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