Thermally Reduced Graphene/MXene Film for Enhanced Li‐ion Storage

Abstract

Two-dimensional transition-metal carbides called MXenes are emerging electrode materials for energy storage due to their metallice lectrical conductivity and low ion diffusion barrier.I nt his work, we combinedT i 2 CT x MXene with graphene oxide (GO) followed by at hermalt reatment to fabricate flexible rGO/Ti 2 CT r film, in which electrochemically active rGO and Ti 2 CT r nanosheets impedet he stacking of layers and synergistically interactp roducing ionically and electronically conducting electrodes. The effect of the thermal treatment on the electrochemical performance of Ti 2 CT x is evaluated. As anode for Li-ion storage, the thermally treated Ti 2 CT r possesses ah igherc apacity in comparison to asprepared Ti 2 CT x .T he freestanding hybrid rGO/Ti 2 CT r films exhibit excellent reversible capacity (700 mAh g À1 at 0.1 Ag À1 ), cycling stability and rate performance. Additionally,f lexible rGO/Ti 3 C 2 T r films are made using the same method and also present improved capacity.T herefore, this study providesa simple, yet effective, approach to combine rGO with different MXenes, which can enhancet heir electrochemical properties for Li-ion batteries.[a] Dr.

Scalable 3D Self‐Assembly of MXene Films for Flexible Sandwich and Microsized Supercapacitors

“…During the reduction process, some negatively charged oxygen‐containing functional groups on MXene sheets will be removed, as suggested by XPS spectra. [ 44,45 ] In the XPS spectra, the Ti/O atom ratio of pristine MXene is 0.90 (Figure S5, Supporting Information), which reveals that the pristine MXene possesses abundant oxygen‐containing functional groups. Compared with the case of pristine MXene, the MXene films have a larger Ti/O atom ratio (1.89), revealing the removal of some oxygen‐containing functional groups during the self‐assembly process.…”

Flexible freestanding all-MXene hybrid films with enhanced capacitive performance for powering a flex sensor

“…M2XTx MXenes were generally used as anode materials for alkali metal-ion batteries or non-aqueous hybrid energy storage devices. [29][30][31][32][33] However, M2XTx MXenes may achieve higher specific capacitance than Ti3C2Tx. 34,35 Theoretical calculation predicted Nb2C to possess superior gravimetric and areal capacitances than Ti3C2.…”

Porosity Engineering of MXene Membrane towards Polysulfide Inhibition and Fast Lithium Ion Transportation for Lithium–Sulfur Batteries

“…The reason for the decreased interlayer spacing in PM may be due to the partial removal of -F surface terminals, which will be analyzed latter. [45] However, with a higher Cu 2+ concentration, the interlayer distance of PM (1.0 m) is calculated to be 14.5 Å (corresponding to XRD peak at 6.08°), which is smaller than that of Ti 3 C 2 T x but larger than that of PM (0.2 m) and PM (0.4 m). This is probably because of more Cu 2+ intercalation between Ti 3 C 2 T x flakes during the catalytic oxidation process.…”