Hierarchical crumpled NiMn2O4@MXene composites for high rate ion transport electrochemical supercapacitors

Hailong Yan, Jinbing Cheng, Zuxue Bai, Tao Peng, Yang Lu, Jang Kyo Kim, Yongsong Luo

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

MXenes have received great attention due to their excellent features such as metal-like electronic conductivity, hydrophilic surface groups, and high volum47150, 21808114), and the Foundatio47150, 21808114), and the Foundatioetric capacitance. However, many performances of MXenes are still unsatisfactory due to their low energy density and easy horizontal stacking. In this work, an NiMn2O4@MXene composite with a crumpled surface was fabricated by a hydrothermal method and a developed dip-coating method. The maximum specific capacitance of the electrode is about 1.52 times that of NiMn2O4. Besides, it delivers a retention rate of 93.3% after 4000 cycles due to the increased transport of ions and electrons by the crumpled surface. An asymmetrical device based on the crumpled NiMn2O4@MXene composite and AC was also assembled, which shows an ultra-high energy density. This work provides an effective strategy to solve the vertical stacking problem of MXenes, which can open new avenues for large-scale applications of MXenes in energy storage.

Original languageBritish English
Pages (from-to)9827-9832
Number of pages6
JournalDalton Transactions
Volume50
Issue number28
DOIs
StatePublished - 28 Jul 2021

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