Journal
2D MATERIALS
Volume 10, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2053-1583/ac953b
Keywords
chlorine termination; nitride MXene; lithium-ion battery (LIB); XAFS
Categories
Ask authors/readers for more resources
Transition metal carbides or nitrides, known as MXenes, are promising two-dimensional materials for energy conversion and storage. The surface chemistry of MXenes can be tuned to influence their physicochemical properties. In this study, Ti2NT (x) MXene with -Cl and -O terminations was obtained through copper chloride molten salt etching at a low temperature. The surface terminations were found to affect the lithium-ion storage performance.
Transition metal carbides or nitrides, collectively known as MXenes, are burgeoning two-dimensional materials for energy conversion and storage. The surface chemistry of MXenes could be specially tuned by the modified surface terminations, which directly influences their physicochemical properties. However, the in-depth study and understanding of the specific microstructure and the influence on the electrochemical performance of these terminations remain lacking. Herein, we present an accordion layered Ti2NT (x) MXene with -Cl and -O terminations obtained from copper chloride molten salt etching at a relatively low temperature. X-ray absorption fine structure and x-ray photoelectron spectroscopy analyses reveal the formation of Ti-Cl and Ti-O bonds on the surface of Ti2NT (x) MXene. Density functional theory calculations further suggest that the surface terminations tend to be replaced by -O terminations after Ti-Cl decoration, which implies promising lithium-ion storage performance due to the high lithium affinity of -O terminations. As a result, the Ti2NT (x) MXene based electrode delivers a high reversible capacity (303.4 mAh g(-1) at 100 mA g(-1)), stable cycling capability (1200 cycles without capacity attenuation), and fast Li+ storage (52% capacity retention at 32 C). This work provides a new vision for MXene surface chemistry and an effective avenue to prepare high-performance nitride electrodes, expanding the diversity and controllability of the MXenes family.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available