Nickel-adsorbed two-dimensional Nb2C MXene for enhanced energy storage applications

Owing to the tremendous energy storage capacity of two-dimensional transition metal carbides (MXenes), they have been efficiently utilized as a promising candidate in the field of super-capacitors. The energy storage capacity of MXenes can be further enhanced using metal dopants. Herein, we have reported the synthesis of pristine and nickel doped niobium-carbide (Nb2C) MXenes, their computational and electrochemical properties. Upon introduction of nickel (Ni) the TDOS increases and a continuous DOS pattern is observed which indicates coupling between Ni and pristine MXene. The alterations in the DOS, predominantly in the nearby region of the Fermi level are profitable for our electrochemical applications. Additionally, the Ni-doped sample shows a significant capacitive performance of 666.67 F g(-1) which can be attributed to the additional active sites generated by doping with Ni. It is worth noting that doped MXenes exhibited a capacitance retention of 81% up to 10 000 cycles. The current study unveils the opportunities of using MXenes with different metal dopants and hypothesize on their performance for energy storage devices.

Automated summary

Due to their high energy storage capacity, two-dimensional transition metal carbides (MXenes) have been widely studied as a promising candidate for supercapacitors. In this study, the synthesis, computational and electrochemical properties of pristine and nickel-doped niobium-carbide (Nb2C) MXenes were reported. The introduction of nickel increased the total density of states (TDOS) and showed a continuous density of states (DOS) pattern, indicating coupling between nickel and pristine MXene. The Ni-doped sample exhibited a significant capacitive performance and a high capacitance retention up to 10,000 cycles.