Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 2, Pages 1811-1820Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b02259
Keywords
folded structured MXene; supercapacitors; volumetric performance; mass loading; rate capability
Funding
- China Postdoctoral Science Foundation [2019M661274]
- National Natural Science Foundation of China [51790502]
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A Ti3C2Tx MXene film assembled by using conventional vacuum-assisted filtration has an outstanding volumetric performance due to its excellent pseudocapacitive and high density. However, the severely high energy and time consumption by vacuum-assisted filtration will limit its practical mass production as electrodes; meanwhile, the self-restacking of MXene nanosheets increases ion diffusion limitation, especially for thicker film electrodes. Herein, a simple strategy is employed to fabricate a compact and nanoporous MXene film with folded structure (CN-MX) by mechanically pressing a three-dimensional MXene aerogel, resulting in an increased packing density and electrical conductivity (8681 S m(-1)) while retaining sufficiently abundant ion-accessible active sites. In addition, the formed highly interconnected nanopore channels can facilitate more rapid ionic and electronic transport. When applied as additive-free electrodes for supercapacitors, the CN-MX delivers a comparable volumetric capacitance and much improved rate capability performance compared to the MXene film fabricated by vacuum-assisted filtration. More impressively, it can still exhibit an attractive volumetric capacitance even at practical levels of mass loading (above 10 mg cm(-2)). This study opens a feasible avenue forward toward commercial applications of MXene in portable and compact storage devices.
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