MXene package electrically activated carbon as a high-performance ultra-flexible electrode
In recent years, flexible super capacitor due to meet the needs of modern wearable devices and portable electronic devices caused great interest. One of the key challenges of manufacturing a flexible supercapacitor electrode is manufactured having excellent mechanical flexibility. Although various carbon materials such asfibers, carbon nanotubes, carbon airgel, carbon and carbonized graphene electrode materials are proposed as a super capacitor, but activated carbon (ACs) are the most commonly used because they have a large surface area , pore size and other characteristics can be adjusted. However, the powder for producing the AC electrodes require a polymer binder, such as polytetrafluoroethylene (PTFE) and the like, which typically occupies 10-25% without much contribution to the capacitance of the electrode quality and thus reduces the energy density of the device. Further, the polymeric binder is an electrical insulator, due to increased resistance, which is disadvantageous to the power density of , so a small amount of AC electrode conductive additive to increase conductivity. Because the rigidity and the binder usually used to increase the flexibility of the flexible substrate. Conventional flexible substrate matrix mainly of carbon (including carbon nanotubes and graphene), textiles, sponges, and the like. 2D includes a flexible substrate s transition metal carbides and nitrides, having a high conductivity and flexibility, they can be used in batteries and super capacitors graphene as a competition. [Introduction achievement Recently, Professor Yury Gogotsi Beijing University of Chemical Technology, Jilin University professor Xu Bin and research group reported a novel strategy, Ti3C2Tx MXene 2D-based materials as a flexible conductive adhesive, which is in the organic electrolyte supercapacitor produced MXene flexible bonded carbon electrode. In the flexible electrode, AC MXene particles are encapsulated between layers. In this unique structure layout, MXene layer provides flexibility, which is essential for the flexible electrode is formed, and to build a 3D conductive network to facilitate electron transport. AC expanded particles MXene distance between layers, and to ensure that the electrolyte ions easily permeate. The thus prepared flexible AC / MXene electrode exhibits high capacitance and excellent in rate performance organic electrolyte. The study, published in the leading journals energy ACS Energy Letters. Photo [A] Figure 2. Different AC / MXene ratios and AC-PVDF in 1M Et4NBF4 / AN CLPChemical properties; (a) 10mV / s CV curves when; (b) when the GCD curve 100mA / g; (d) and the impedance equivalent circuit As used herein, 2D Ti3C2Tx MXene as a base material, a synthetic AC / MXene as a super the flexible capacitor electrode, and electrochemical characterization, proved MXene further based activated carbon material as a flexible electrode, and for the possibility of high performance supercapacitors: MXene base play multiple roles in the electrode material, wherein the nano-sheet can provide excellent mechanical flexibility and conductivity, so that the electrode material is excellent in rate performance; the AC particles have a maximum surface area and unique structure, which layer is encapsulated between MXene, can provide some specific capacitance; different AC / MXene comparative example, the AC / MXene-2: 1 flexible electrode has excellent electrochemical performance, 1M Et4NBF4 / AN organic electrolyte at 0.1A / g, the specific capacitance as high as 126F / g, and at 100A / g, the capacitance retention rate is still 57.9%.