A nanoporous MXene film enables flexible supercapacitors with high energy storage

Fan, Zhimin; Wang, Youshan; Xie, Zhimin; Xu, Xueqing; Yin, Yuan‐Qi; Cheng, Zhongjun; Liu, Yuyan

doi:10.1039/c8nr01550c

Cited by 192 publications

(109 citation statements)

References 53 publications

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“…When areal capacitances as a function of MXene mass loading are plotted (Figure d and Figure S7 in the Supporting Information), an excellent linear relationship is presented at current density less than 30 mA cm −2 . To our knowledge, once MXene loading increases, the areal capacitance becomes very difficult to increase proportionately, as found in other reports . This demonstrates that our method is very effective to facilitate the ion diffusion and improve the electrochemical performance of flexible electrodes.…”

Section: Resultssupporting

confidence: 73%

Engineering 3D Ion Transport Channels for Flexible MXene Films with Superior Capacitive Performance

Wang

Xue

et al. 2019

Adv Funct Materials

240

191

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2D MXene materials are of considerable interest for future energy storage. A MXene film could be used as an effective flexible supercapacitor electrode due to its flexibility and, more importantly, its high specific capacitance. However, although it has excellent electronic conductivity, sluggish ionic kinetics within the MXene film becomes a fundamental limitation to the electrochemical performance. To compensate for the relative deficiency, MXene films are frequently reduced to several micrometer dimensions with low mass loading (<1 mg cm−2), to the point of detriment of areal performance and commercial value. Herein, for the first time, the design of a 3D porous MXene/bacterial cellulose (BC) self‐supporting film is reported for ultrahigh capacitance performance (416 F g−1, 2084 mF cm−2) with outstanding mechanical properties and high flexibility, even when the MXene loading reaches 5 mg cm−2. The highly interconnected MXene/BC network enables both excellent electron and ion transport channel. Additionally, a maximum energy density of 252 µWh cm−2 is achieved in an asymmetric supercapacitor, higher than that of all ever‐reported MXene‐based supercapacitors. This work exploits a simple route for assembling 2D MXene materials into 3D porous films as state‐of‐the‐art electrodes for high performance energy storage devices.

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Section: Resultssupporting

confidence: 73%

Engineering 3D Ion Transport Channels for Flexible MXene Films with Superior Capacitive Performance

Wang

Xue

et al. 2019

Adv Funct Materials

240

191

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“…Nanoporous Mxene films were formed using Fe(OH) 3 nanoparticles, which were used in order to prevent re‐stacking of Mxenes ( Figure 20 ). [ 265 ] This approach facilitated the formation of highly interconnected nanopore channels, which promoted efficient ion transport. It has been demonstrated that 2D transition metal carbides can operate at rates exceeding those of conventional ELDCs, but can provide higher volumetric and areal capacitances than carbon.…”

Section: Mxenes Mofs and Compositesmentioning

confidence: 99%

The Development of Pseudocapacitor Electrodes and Devices with High Active Mass Loading

Chen

Sahu

et al. 2020

Advanced Energy Materials

188

128

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Pseudocapacitive materials are used for supercapacitor applications due to their exceptionally high capacitance and low cost. Good capacitive performance of the pseudocapacitive materials at high active mass loadings is vital for the development of the next generation of supercapacitor devices. This review describes recent advances in materials and nanotechnologies, which allows the development of advanced pseudocapacitive devices with high active mass. An important breakthrough is the discovery of novel dispersing and capping agents for the colloidal processing of nanoparticles. Particularly important are novel co‐dispersants that exhibit enhanced adsorption on materials of different types, such as inorganic nanoparticles, carbon nanotubes, and graphene. Conceptually new strategies are designed to fabricate coated particles. Recent innovations pave the way for the development of multifunctional redox‐active dopants‐dispersants and dopants‐oxidants to manufacture conductive polymer composites. Among the most important advances in nanotechnology is the development of template methods and heterocoagulation techniques for composite manufacturing. The progress in the design of novel surface modification techniques and materials, discovery of advanced anchoring groups, and development of liquid–liquid extraction allows agglomerate‐free processing of nanomaterials and composites. This review describes fundamental aspects of novel technologies and their applications in the manufacturing of pseudocapacitive devices for energy storage.

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“…Characterizations AJ EOL JSM-6700F scanning electron microscope (SEM) with an accelerating voltage of 5kVw as used to characterize the morphology of the samples, and aJ EOL2011m icroscope with an acceleration voltage of 200 kV was used to obtain EDX element mapping images. Transmission electron microscopy (TEM) analyses were per- rGO [2a] 12.4 1 pure MXene film [27] 288 1 900 N-Ti 2 CT x [3a] 327…”

Section: Preparation Of Co 3 O 4 -Mxene/rgo Hybrid Porous Aerogelsmentioning

confidence: 99%

Fabrication of Cobaltosic Oxide Nanoparticle‐Doped 3 D MXene/Graphene Hybrid Porous Aerogels for All‐Solid‐State Supercapacitors

Zhang

Tang

et al. 2019

Chemistry A European J

121

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MXenes are an ew family of 2D transition metal carbides and nitrides,w hich have attracted enormous attention in electrochemicale nergys torage,s ensingt echnology, and catalysis owing to their good conductivity, high specific surface area, and excellent electrochemical properties.I nt his work, as eries of Co 3 O 4 -doped 3D MXene/RGO hybrid porousa erogels is designed and prepared through af acile in situ reduction and thermala nnealing process, in which the reduced graphene oxide (RGO) conductiven etwork can electrically link the separated Co 3 O 4 -MXene composite nanosheets,l eading to enhanced electronic conductivity. It is found that upon using the Co 3 O 4 -MXene/RGO hybrid porous aerogelp repared with am ass ratio of Co 3 O 4 -MXene/RGOo f 3:1( CMR31) as an electrode for as upercapacitor,asuperior specific capacitance of 345 Fg À1 at the current density of 1Ag À1 is achieved, which is significantly higher than those of Ti 3 C 2 T x MXene, RGO, and MXene/RGO electrodes. In addition, ah igh capacitance retention (85 %o ft he initialc apacitance after 10 000 cycles at ah igh current density of 3Ag À1 ) and al ow internal resistance R s (0.44 W)c an be achieved. An all-solid-state asymmetric supercapacitor( ASC) device is assembled using CMR31, and it has the ability to light up a blue LED indicator for 5min if four ASCs are connected in series. Therefore, these novel Co 3 O 4 -MXene/RGOh ybrid porous aerogels have potential practical applicationsi n high-energys torage devices.

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A nanoporous MXene film enables flexible supercapacitors with high energy storage

Cited by 192 publications

References 53 publications

Engineering 3D Ion Transport Channels for Flexible MXene Films with Superior Capacitive Performance

Engineering 3D Ion Transport Channels for Flexible MXene Films with Superior Capacitive Performance

The Development of Pseudocapacitor Electrodes and Devices with High Active Mass Loading

Fabrication of Cobaltosic Oxide Nanoparticle‐Doped 3 D MXene/Graphene Hybrid Porous Aerogels for All‐Solid‐State Supercapacitors

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