Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 46, Pages 20628-20635Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202009086
Keywords
colloidal assembly; nanosheets; supercapacitors; superlattices; two-dimensional materials
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Funding
- NSFC [21872038, 21733003]
- MOST [2017YFA0207303]
- Key Basic Research Program of Science and Technology Commission of Shanghai Municipality [17JC1400100]
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Inspired by the self-assembly of nanoparticle superlattices, we report a general method that exploits long-chain molecular ligands to induce ordered assembly of colloidal nanosheets (NSs), resulting in 2D laminate superlattices with high packing density. Co-assembly of two types of NSs further enables 2D/2D heterostructured superlattices. As a proof of concept, co-assembly of Ti(3)C(2)T(x)and graphene oxide (GO) NSs followed by thermal annealing leads to MXene-rGO superlattices with tunable microstructures, which exhibit significantly higher capacitance than their filtrated counterparts, delivering an ultrahigh volumetric capacitance of 1443 F cm(-3)at 2 mV s(-1). Moreover, the as-fabricated binder-free symmetric supercapacitors show a high volumetric energy density of 42.1 Wh L-1, which is among the best reported for MXene-based materials in aqueous electrolytes. This work paves the way toward rational design of 2D material-based superstructures for energy applications.
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