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Title: Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance

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. Furthermore, 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.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [2];  [2]; ORCiD logo [2]
  1. Drexel Univ., Philadelphia, PA (United States); Harbin Engineering Univ., Harbin (China)
  2. Drexel Univ., Philadelphia, PA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1399231
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 27; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; energy density; graphene; MXene; supercapacitors; volumetric performance

Citation Formats

Yan, Jun, Ren, Chang E., Maleski, Kathleen, Hatter, Christine B., Anasori, Babak, Urbankowski, Patrick, Sarycheva, Asya, and Gogotsi, Yury G. Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance. United States: N. p., 2017. Web. doi:10.1002/adfm.201701264.
Yan, Jun, Ren, Chang E., Maleski, Kathleen, Hatter, Christine B., Anasori, Babak, Urbankowski, Patrick, Sarycheva, Asya, & Gogotsi, Yury G. Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance. United States. doi:10.1002/adfm.201701264.
Yan, Jun, Ren, Chang E., Maleski, Kathleen, Hatter, Christine B., Anasori, Babak, Urbankowski, Patrick, Sarycheva, Asya, and Gogotsi, Yury G. Fri . "Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance". United States. doi:10.1002/adfm.201701264.
@article{osti_1399231,
title = {Flexible MXene/Graphene Films for Ultrafast Supercapacitors with Outstanding Volumetric Capacitance},
author = {Yan, Jun and Ren, Chang E. and Maleski, Kathleen and Hatter, Christine B. and Anasori, Babak and Urbankowski, Patrick and Sarycheva, Asya and Gogotsi, Yury G.},
abstractNote = {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. Furthermore, 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.},
doi = {10.1002/adfm.201701264},
journal = {Advanced Functional Materials},
issn = {1616-301X},
number = ,
volume = 27,
place = {United States},
year = {2017},
month = {6}
}

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