Far-infrared Reduced Graphene Oxide As Electrode And Its Application In Energy Storage

Graphene, two-dimensional layers with one-atomic thickness, has been attractinggreat interest because of its fascinating electronic, thermal, and mechanical properties,and a wide range of potential applications such as sensors, energy storage andcatalysis, etc. The graphene mass production methods are mainly chemical oxidationreduction, at present. However, it has inherent shortcomings in the existing reductionmethods and limits its application in the field of energy storage. A novel far-infraredthermal reduction process is reported to effectively reduce graphene oxide films forenergy storage and electrode applications. Main works include:1、The graphene oxide films used in this study were produced by electro-spraydeposition of a graphene oxide colloidal solution onto a substrate. The reduction ofgraphene oxide was performed using a commercial far-infrared convection oven thatis ubiquitous in homes for cooking and heating food. The degree of graphene oxidereduction with different far-infrared irradiation time was characterized by IR, XRD,TG, XPS, BET and AFM. The results indicated that the far-infrared thermal reductionprocess to effectively reduce graphene oxide. When the far-infrared irradiationprocess was completed in4minutes that the surface area was565m2/g, and the C/Oratio was5.5.2、The stainless steel sheets are used as substrate in the electro-spray of grapheneoxide colloidal solution.The graphene oxide films are formed by different far-infraredirradiation times. The supercapacitors with graphene electrodes in water system weremanufactured using buckle structure.The electrochemical properties of grapheneelectrode materials were examined by cyclic voltammetry, galcanostatic charge-discharge and electrochemical impedance.The results indicated that far-infraredreduced graphene at far-infrared irradiation time of4min displayed perfectelectrochemical performance. It is found that a single graphene electrode can providea very high capacitance value of309.4F/g at0.2A/g and retain a relatively highcapacitance (about141F/g) at10A/g. After10000charge/discharge cycles at1A/g,about94.1%of the capacity is maintained. 3、The copper foil are used substrate in the electro-spray of graphene oxidecolloidal solution. The graphene oxide films with far-infrared irradiation time of4min.The electrochemical performance of graphene as anode material for lithium ionbattery was studied. The electrochemical properties of graphene electrode materialswere examined by cyclic voltammetry, galcanostatic charge-discharge andelectrochemical impedance. The results indicated that the graphene electrodedisplayed perfect electrochemical performance. At5C (current density of1.86A/g),far-infrared reduced graphene provides a stable discharge capacity of494mAh/g.After charge and discharge1000cycles at20C (7.44A/g), the capacity retention ofgraphene was93.9%.4、The symmetric supercapacitors graphene electrodes and lithium ion batterygraphene electrodes without any additional binders or conductive additives. Thereindicate excellent electrochemical performance, and for its further research anddevelopment has laid a certain foundation.