Electrosynthesis Of Latticed Dried Foam Films Of Graphene- Polypyrrole & Polyaniline On Titanium Mesh As Supercapacitor Materials

Since graphene obtained in 2004, it has showed great potential application in supercapacitors. Electroreduction of graphene oxide （GO） is an effective methods to prepare reduction graphene （rGO） of low defect and high capacitance our group developed a method to obtain a fantasy dried GO foam film, which can be reduced to an ultrathin graphene film. In this work, we coated titanium mashes with GO obtaining latticed foam films （LFF） of GO in this method, then reducing to latticed rGO foam films （rGO LFF） as materials for supercapacitor. It remedied the defect of a simple rGO foam film that may easily broke. Otherwise, the easiness of changing the shape of titanium mash made it convenient to custom make a shape we needed, which showed a great application potential in wearable devices.Because of the skeleton supports of the titanium mash, it is easy to do some modification on the rGO LFF and no need to worry about the possibility of broken. Thus, we grew polypyrrole （Ppy） and polyaniline （Pani） on the surface of rGO LFF by electrodeposition, obtaining rGO LFF, Ppy/rGO LFF and Pani/rGO LFF. The faradaic pseudocapacitance and the specific surface broaden effect of Ppy and Pani improved the capacitance of the material. Then, we did a further work to grow Ppy and PAni together on rGO LFF by coelectrodeposition and tested the capacitance performances of these materials.After test, we found rGO LFF perform a highest specific capacitance of 149.6 F g^-1 and 157.1 F cm^-3 and the polymer on rGO LFF enlarged the specific capacitance in polymer/rGO LFF. Pani/rGO LFF performs a highest specific capacitance of 633.4 F g^-1 and 664.7 F cm^-3 at a scan rate of 10 mV s^-1 by cyclic voltammetry （CV）,250.0 F g^-1 and 262.5 F cm^-3 at a large current density of 33.3 A g^-1 by galvanostatic charge-discharge （GCD）. For the circulating GCD, after 5000 times of large current GCD, PPy/RGO LFF keeps a highest specific capacitance of 161.7 F g^-1 in acid solution and Pani/rGO LFF keeps a highest specific capacitance of 127.9 F g^-1 in neutral solution. The circulating GCD performance of Ppy-Pani/rGO LFF prepared with 1:3 of the concentration proportion of Py and Ani performed similar to Ppy/rGO in acid solution and similar to Pani/rGO LFF in neutral solution, that nicely synthesized the advantages of Ppy/rGO LFF and Pani/rGO LFF.