Journal article
Optimizing Ion Pathway in Titanium Carbide MXene for Practical High‐Rate Supercapacitor
Advanced energy materials, v 11(4), pn/a
27 Jan 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The lengthened ion pathway in restacked 2D materials greatly limits the electrochemical performance of practically dense film electrodes (mass loading >10 mg cm−2). Typical strategies such as the insertion of nanomaterials and 3D‐structure design is expected to reduce the volumetric capacitance of Ti3C2Tx electrodes, diminishing the dominating advantage of Ti3C2Tx over other electrode materials. Here, a novel, facile, and controllable H2SO4 oxidation method is developed for alleviating the restacking issue of Ti3C2Tx film with few electrochemically inactive side‐products such as TiO2. A hierarchical ion path “highway” in Ti3C2Tx film is fabricated with porous structure, atomic‐level increased interlayer spacing, and reduced flake size (through probe‐sonication). As a result, ultra‐high rate performance is obtained with high volumetric capacitance. For a ≈1.1 µm thick Ti3C2Tx film, capacitance retention of 64% is obtained (208 F g−1/756 F cm−3) when the scan rate is increased from 5 to 10,000 mV s−1. Even at higher mass loadings exceeding 12 mg cm−2 (48 µm thickness), the rate capability is still comparable to unoptimized Ti3C2Tx electrodes with low mass loading (1 mg cm−2). Consequently, a high areal capacitance of ≈3.2 F cm−2 is achieved for pathway‐optimized thick Ti3C2Tx film, which is of great significance for practical applications.
A concentrated H2SO4 oxidation technique is developed for etching holes on Ti3C2Tx MXene, which simultaneously removes side products such as TiO2. Freestanding film electrodes assembled with H2SO4‐etched small flake Ti3C2Tx nanosheets show an optimized ion pathway with reduced flake size, increased interlayer spacing, and in‐plane pores. Ultrahigh rate performance is obtained even at high mass loadings exceeding 12 mg cm−2.
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Details
- Title
- Optimizing Ion Pathway in Titanium Carbide MXene for Practical High‐Rate Supercapacitor
- Creators
- Jun Tang - Peking UniversityTyler Mathis - Drexel UniversityXiongwei Zhong - Southern University of Science and TechnologyXu Xiao - University of Electronic Science and Technology of ChinaHao Wang - Nanyang Technological UniversityMark Anayee - Drexel UniversityFeng Pan - Peking UniversityBaomin Xu - Southern University of Science and TechnologyYury Gogotsi - Drexel University
- Publication Details
- Advanced energy materials, v 11(4), pn/a
- Publisher
- Wiley
- Number of pages
- 8
- Grant note
- University of Electronic Science and Technology of China (A1098531023601243) National Science Foundation Graduate Research Fellowship (DGE‐1646737) Shenzhen Science and Technology Innovation Committee (JCYJ20170412154554048) Peacock Team Project funding from Shenzhen Science and Technology Innovation Committee (KQTD2015033110182370)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000598278900001
- Scopus ID
- 2-s2.0-85097508341
- Other Identifier
- 991014969890804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter