Study On Electrockinetic Effect Of Two-Dimensional Materials MXene

To harvest clean energy from the surrounding environment and power the equipment are of significant importance under the rapidly developing requirements from implantable biomedical devices and miniaturized wireless electronics.The electrokinetic effect in nanopores provides a potential solution for extracting clean energy from the environment by converting mechanical energy in fluid into electrical energy.At present,the power density of the nanofluidic effect is not high enough,becoming one of the main bottlenecks restricting its application.The rapid transport of ion channels provided between the two-dimensional materials greatly promotes the development of this field.Herein,we report a vertically-oriented MXene membranes(VMMs)prepared through vacuum filtration combined with MEMS fabrication technology.By comparing with the MXene film(HMM)arranged in parallel with the nanosheets,the effect of the two-dimensional nanosheets arrangement direction on ion transport and energy conversion was studied.The experimental results showed that the ion permeability of VMM is more than three orders of magnitude higher than that of HMM.Because VMM has both high selectivity and permeability,VMM can generate 8.17 A m-2 streaming current under hydraulic drive,which is better than all reported nanoporous materials.Through theoretical analysis and numerical simulation,we revealed the fast ion transport mechanism in VMM.First,the vertically arranged two-dimensional nanosheets structure provides channels in the same direction as the membrane expansion,greatly shortening the ion transmission path.Secondly,the penetrating straight channel in VMM reduces the energy loss during ion migration.At the same time,the larger accessible area of the VMM surface,these factors cause the rapid transmission of ions in the VMM.These findings can greatly promote the practical applications of electrokinetic energy conversion devices.These findings have promoted the practical application of electrokinetic energy conversion equipment.Moreover,by revealing the decisive influence of the transport performance of the two-dimensional membrane material in the two-dimensional sheet arrangement direction,it will bring research inspiration to the design of high-performance two-dimensional materials and systems(Such as filtration,separation,detection,catalysis,etc.)related to ion transport.