Establishment And Experimental Study Of Electrochemical Test Device Based On Vibration Mode Of Nanometer Electrode

Energy storage and conversion technology is a major problem for the sustainable development of nano materials and nano catalyst is the key factor to electrochemical energy devices,nano material electrochemical promoted the electrochemical energy science and technology progress,however,research on nanometer scale electrochemical properties of nanocrystalline "intrinsic" has much to explore space.Existing scanning electrochemical microscopy equipment on the nanoscale electrochemical detection still has many problems,such as the lack of the repetitive positioning accuracy and not on the same position measurement,reach nanoscale needlepoint scale,when detecting probe vibration influence of the mass transfer process,the current tunnel will influence the charge transfer process,the ion current will affect the structure of electric double layer,Electrolyte environment and mass transfer process.Based on the above reasons,an electrochemical test device based on the vibration mode of nano-electrode was built in this paper and an experimental study was carried out.The main research work is as follows:Firstly,a set of micro-force servo module based on vibration mode is developed.The core of this module is the flexible hinge driven by excitation piezoelectric ceramic ring,and it can be integrated with diamond probe or electrochemical electrode to work with capacitive sensor and phase-locked amplifier.Taking the micro-force servo module as the core,combined with atomic force microscope,CCD,high-precision two-dimensional air floating platform and three-dimensional piezoelectric displacement platform,a test device for the electrochemical performance of nanocrystals was designed,and its control system was designed.Secondly,the vibration mode-based micro-force servo module with diamond probe is experimentally studied.The resonance frequency was obtained by scanning experiment,and the normal amplitude and normal load resolution were calibrated by a device equipped with a diamond probe.The closed loop of the system was completed by PID control method.Under the closed loop condition,the standard sample scanning experiment was carried out with constant vibration amplitude,and the three-dimensional morphology and section diagrams of the system were obtained.Finally,the micro-force servo module with electrochemical electrode is studied experimentally.The resonance frequency was obtained by scanning,the normal resolution of the device with electrochemical electrode was calibrated,and the critical force causing electrode damage was tested and studied.The electrochemical performance of the equipment was verified by cyclic voltammetry through electrochemical conduction test.The electrochemical detection capability of the device was verified by current-position feedback imaging of clean gallium arsenide and gallium arsenide with graphene surface.