Preparation and characterization of electrochemical properties of nitrogen and boron co-doped MXene composite materials

doi:10.12028/j.issn.2095-4239.2018.0149

Abstract

Abstract: Ti₃C₂T_x MXene sheets were prepared by etching Ti₃AlC₂ MAX ceramic powders, followed by intercalation and ultrasonic exfoliation. With an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate, as a heteroatom-doped N and B source, a new type of N, B-doped MXene (N, B-Ti₃C₂T_x) was synthesized by heat treatment of the MXene at different temperatures, and used as an electrode material for supercapacitor fabrication. The influence of annealing temperature to capacitive performance was studied, and the results indicates that the capacitance performance was effectively improved at a calcination temperature of 300℃. The mass capacitance of N, B-Ti₃C₂T_x-300℃ was measured to be 65 F/g at a scan rate of 100 mV/s, which was 5.5 times higher than that of Ti₃C₂T_x. The EIS showed that the contact resistance of N, B-Ti₃C₂T_x-300℃ was 0.52 Ω. The capacitance retained 84% at a current density of 2 A/g after 1000 cycles.

Key words: MXene, ionic liquid, Nitrogen, boron co-doping, capacitive performance

CLC Number:

TM53

SUN Helei, LI Yunfei, YI Ronghua, WANG Ruochong, ZHOU Aijun, SUN Yimin. Preparation and characterization of electrochemical properties of nitrogen and boron co-doped MXene composite materials[J]. Energy Storage Science and Technology, 2019, 8(1): 130-137.

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