Preparation And Electrochemical Performance Of Laser-Induced Graphene Flexible Free-Standting Electrode Materials

Flexible electronic devices refer to electronic devices that can still work normally under some deformation conditions.With the development of wearable devices,flexible electronic devices will be extensively investigated.As an important part of electronic devices,the preparation of electrodes can directly affect the performance of the device.In traditional methods,the electrode material is connected to the current collector through a binder,which will cause the electrode material to fall off easily and increase the internal resistance,it will affect the practical application.In this paper,electrochemically active materials are grown on flexible laser-induced graphene（LIG）by the method of electrodeposition,and a flexible self-supporting electrode without a binder is constructed,which is applied to glucose sensors and supercapacitors.The main research contents include:（1）Under the irradiation of laser,the polyimide（PI）film is converted into LIG,which is a flexible material,then Ag/Ag Cl/LIG and dendritic Cu/LIG are prepared on LIG by electrodeposition,which are respectively used as a reference electrode and a working electrode to construct a flexible enzymeless glucose sensor.The dendritic Cu/LIG exhibit a linear range from 0.5μM to 365.5μM,with a high sensitivity of 1554.5μA m M^-1 cm^-2,and a low detection limit of 0.0979μM（S/N=3）.it has anti-interference to substances such as dopamine,ascorbic acid,uric acid,serotonine and histamine,and shows high reliability in the detection of human serum.（2）LIG is used as the current collector and 3D porous Mn O₂ is prepared on it by electrodeposition to fabricate a flexible electrode with good capacitance performance.The area specific capacitance of Mn O₂/LIG is 623.5 m F cm^-2 at a current density of 0.5m A cm^-2 and when the current density is increased to 5 m A cm^-2,the capacitance retention rate is 62.7%.After bending to 180°for 100 times,the capacitance performance remains almost unchanged,showing good flexibility,and the capacitance retention rate is 95.2%after 5000 charge-discharge cycles at current densities of 10 m A cm^-2,showing an excellent cycling stability.