Issue 40, 2022

Synthesis of ultra-high specific surface area aerogels with nitrogen-enriched Ti3C2Tx nanosheets as high-performance supercapacitor electrodes

Abstract

Chemical doping of MXenes with heteroatoms is expected to be a promising strategy for enhancing their electrochemical performance. Nevertheless, the synergistic effects of chemical doping and 3D structure construction have rarely been investigated in depth. Aiming to avoid MXene nanosheet restacking and further enhance the electrochemical performance, herein, we reported a simple strategy combining nitrogen doping with a 3D structure construction on MXenes via a one-step hydrothermal method. The location and types of nitrogen doping can be adjusted by hydrothermal conditions. The obtained nitrogen-doped Ti3C2Tx aerogel had an ultra-high specific surface area of 200.8 m2 g−1 with high porosity. The open reticular walls can expose more nitrogen-enriched Ti3C2Tx edges to the electrolyte. Nitrogen dopants at the edges of Ti3C2Tx nanosheets produced more number of active sites and provided higher pseudocapacitance, and the presence of N-C4 increased the electron mobility of Ti3C2Tx, which reduced charge transfer resistance evidently. As a result, the nitrogen-doped Ti3C2Tx aerogel showed an excellent specific capacitance (531 F g−1 in H2SO4 electrolyte) with good cyclic stability (remaining 96% after 5000 cycles).

Graphical abstract: Synthesis of ultra-high specific surface area aerogels with nitrogen-enriched Ti3C2Tx nanosheets as high-performance supercapacitor electrodes

Supplementary files

Article information

Article type
Paper
Submitted
13 May 2022
Accepted
11 Aug 2022
First published
12 Aug 2022

J. Mater. Chem. C, 2022,10, 14929-14938

Synthesis of ultra-high specific surface area aerogels with nitrogen-enriched Ti3C2Tx nanosheets as high-performance supercapacitor electrodes

X. Liu, Y. Liu, S. Dong, X. Zhang and S. Hou, J. Mater. Chem. C, 2022, 10, 14929 DOI: 10.1039/D2TC01987F

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