Journal article
Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance
Advanced functional materials, v 27(30), pp 1701264-n/a
11 Aug 2017
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A strategy to prepare flexible and conductive MXene/graphene (reduced graphene oxide, rGO) supercapacitor electrodes by using electrostatic self‐assembly between positively charged rGO modified with poly(diallyldimethylammonium chloride) and negatively charged titanium carbide MXene nanosheets is presented. After electrostatic assembly, rGO nanosheets are inserted in‐between MXene layers. As a result, the self‐restacking of MXene nanosheets is effectively prevented, leading to a considerably increased interlayer spacing. Accelerated diffusion of electrolyte ions enables more electroactive sites to become accessible. The freestanding MXene/rGO‐5 wt% electrode displays a volumetric capacitance of 1040 F cm−3 at a scan rate of 2 mV s−1 , an impressive rate capability with 61% capacitance retention at 1 V s−1 and long cycle life. Moreover, the fabricated binder‐free symmetric supercapacitor shows an ultrahigh volumetric energy density of 32.6 Wh L−1, which is among the highest values reported for carbon and MXene based materials in aqueous electrolytes. This work provides fundamental insight into the effect of interlayer spacing on the electrochemical performance of 2D hybrid materials and sheds light on the design of next‐generation flexible, portable and highly integrated supercapacitors with high volumetric and rate performances.
MXene/reduced graphene oxide (rGO) hybrid films are prepared through electrostatic self‐assembly of negatively charged MXene nanosheets and positively charged rGO nanosheets. rGO nanosheets are inserted in between MXene layers as conductive spacers, efficiently alleviating the self‐restacking of both rGO and MXene. As a result, the hybrid films exhibit ultrahigh volumetric capacitance and an impressive rate capability.
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Details
- Title
- Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance
- Creators
- Jun Yan - Harbin Engineering UniversityChang E Ren - Drexel UniversityKathleen Maleski - Drexel UniversityChristine B Hatter - Drexel UniversityBabak Anasori - Drexel UniversityPatrick Urbankowski - Drexel UniversityAsya Sarycheva - Drexel UniversityYury Gogotsi - Drexel University
- Publication Details
- Advanced functional materials, v 27(30), pp 1701264-n/a
- Publisher
- Wiley
- Number of pages
- 10
- Grant note
- China Scholarship Council National Natural Science Foundation of China (21571040) Office of Basic Energy Sciences U.S. Department of Energy Office of Science
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000407261700011
- Scopus ID
- 2-s2.0-85021658451
- Other Identifier
- 991014878168104721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied
- Physics, Condensed Matter