摘要
采用水热法制备了以氧化还原石墨烯(rGO)为载体的锰钴水滑石(LDH),即MnCo-LDH/rGO复合材料并研究其氧还原性能.在Mn/Co物质的量比为1:3的条件下,MnCo-LDH和MnCo-LDH/rGO的形貌和催化性能最为突出.与MnCo-LDH相比,MnCo-LDH/rGO在Na2SO4溶液中的氧化还原峰更加明显(-0.425V),且峰电流更大,达到0.749mA/cm^2.将MnCo-LDH/rGO作为阴极,在120min内持续提供30mA/cm^2的电流可使浓度为20mg/L的罗丹明B染料(RhB)降解98.6%,具备良好的降解性能.旋转圆盘(RDE)及自由基淬灭实验结果显示,反应中转移电子数为2,且主要自由基为·OH.
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/cm^2).Furthermore,the MnCo-LDH/rGO afforded a Rhodamine dye B(RhB)degradation rate of 98.6%in 120min with a current density of 30mA/cm^2,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.
作者
邢嘉钰
李丽
张国权
杨凤林
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)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2020年第11期4804-4812,共9页
China Environmental Science
基金
国家自然科学基金资助项目(21437001)。
