锰钴水滑石/石墨烯电极的制备及催化性能

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Abstract

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.

Key words： Mn-Co-LDH reduced graphene oxide rhodamine B degradation electrochemical catalysis

Received: 25 March 2020

PACS:

X703.5

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	XING Jia-yu
	LI li
	ZHANG Guo-quan
	YANG Feng-lin

Cite this article:

XING Jia-yu,LI li,ZHANG Guo-quan等. The preparation and catalytic performance of MnCo layered double hydroxides/reduced graphene oxide electrode[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4804-4812.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I11/4804

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