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锰钴水滑石/石墨烯电极的制备及催化性能
The preparation and catalytic performance of MnCo layered double hydroxides/reduced graphene oxide electrode
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/cm2.将MnCo-LDH/rGO作为阴极，在120min内持续提供30mA/cm2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/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.
电化学催化 / 罗丹明B降解 / 锰钴双氢氧化物 / 氧化还原石墨烯
electrochemical catalysis / Mn-Co-LDH / reduced graphene oxide / rhodamine B degradation
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