High pseudocapacitance of MnO2 nanoparticles in graphitic disordered mesoporous carbon at high scan rates

Patel, Mehul; Wang, Xiqing; Slanac, Daniel A.; Ferrer, Domingo; Dai, Sheng; Johnston, Keith P.; Stevenson, Keith J.

doi:10.1039/c1jm14513d

Cited by 87 publications

(52 citation statements)

References 45 publications

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“…Qualitatively, all plots are similar in shape, beginning with a semi-circle or arc at high frequencies, followed by a straight line inclined at an angle of around 45°to the real axis in the medium frequency region, and a nearly vertical line in the low frequency region. Previous work suggested that such a pattern of the EIS can be fit by an equivalent Randles circuit [26,28,[36][37][38][39][40][41][42][43][44][45], as shown in the inset of Fig. 3a.…”

Section: 2mentioning

confidence: 97%

Capacitance behavior of ordered mesoporous carbon/Fe2O3 composites: Comparison between 1D cylindrical, 2D hexagonal, and 3D bicontinuous mesostructures

Noked

Gillette

et al. 2015

Carbon

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A B S T R A C TThe combination of high electronic conductivity, enhanced ionic mobility, and high pore volume make ordered mesoporous carbons promising scaffolds for active energy storage materials. However, mesoporous morphology and structural stability needs to be more thoroughly addressed. In this paper, we demonstrate Fe 2 O 3 impregnation into 1D cylindrical (FDU-15), 2D hexagonal (CMK-3), and 3D bicontinuous (CMK-8) symmetries of mesoporous carbons. We use these materials for a systematic study of the effect of mesoporous architecture on the structure stability, ion mobility, and performance of mesoporous composite electrodes. By optimization of the porous structure, the oxide impregnation enabled relatively high performance: >650 F g À1 of Fe 2 O 3 and >200 F g À1 total capacitance. This work highlights the new considerations of structure degradation in different pore symmetries with active material impregnation and its effect on ion mobility and electrochemical performance in porous scaffold electrodes. The results show that the most commonly used 2D CMK-3 is not suitable as a host material due to its poor structure stability and ion mobility, while the 1D FDU-15 and 3D CMK-8 have their own merits related to framework stability and porous structures.

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Section: 2mentioning

confidence: 97%

Capacitance behavior of ordered mesoporous carbon/Fe2O3 composites: Comparison between 1D cylindrical, 2D hexagonal, and 3D bicontinuous mesostructures

Noked

Gillette

et al. 2015

Carbon

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“…[23,24] However, the ultralow mass loading of electroactive materials cannot satisfy any practical applications. Indeed, the capacitance of MnO 2 in most relevant studies is only 150-250 F g À1 , [25][26][27][28] which is far lower than the theoretical value because the usage of MnO 2 has suffered from low electrical conductivity, severe agglomeration, and low utilization of active materials. [29] In contrast to MnO 2 , carbon materials are highly conductive, porous, and chemically stable; they are thus suitable substrates to improve the above issues.…”

Section: Introductionmentioning

confidence: 94%

“…Notably, the electrical conductivity of HPCs might not be as high as graphitized carbons, such as CNTs and graphene, yet the improvement in ion diffusion greatly enhances the overall performance of MnO 2 /HPCs because the rates of both electron transport and ion diffusion within MnO 2 /HPCs must be compatible to achieve optimal performance. [25,26,28,29,32,33] indicating the high utilization efficiency of MnO 2 on specific capacitance in our MnO 2 /HPCs. This result also means that HPCs with abundant mesopores are an excellent support to uniformly disperse the well-separated MnO 2 nanocrystals (3-5 nm in diameter), which can serve as a superior electrode material for constructing high-performance ECs.…”

mentioning

confidence: 89%

“…In general, CNTs, graphene, and highly graphitic carbons are attractive for this application because of the dramatic improvement in electrical conductivity of resultant MnO 2 composites. [28,38] However, the utilization efficiency and rate capability of MnO 2 are still big issues in most composites. Lei lent electrochemical performances, whereas the MnO 2 -based specific capacitance was only 280 F g À1 because of the high loading of MnO 2 (ca.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

Chou

Doong

et al. 2014

ChemSusChem

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A promising energy storage material, MnO2 /hierarchically porous carbon (HPC) nanocomposites, with exceptional electrochemical performance and ultrahigh energy density was developed for asymmetric supercapacitor applications. The microstructures of MnO2 /HPC nanocomposites were characterized by transmission electron microscopy, scanning transmission electron microscopy, and electron dispersive X-ray elemental mapping analysis. The 3-5 nm MnO2 nanocrystals at mass loadings of 7.3-10.8 wt % are homogeneously distributed onto the HPCs, and the utilization efficiency of MnO2 on specific capacitance can be enhanced to 94-96 %. By combining the ultrahigh utilization efficiency of MnO2 and the conductive and ion-transport advantages of HPCs, MnO2 /HPC electrodes can achieve higher specific capacitance values (196 F g(-1) ) than those of pure carbon electrodes (60.8 F g(-1) ), and maintain their superior rate capability in neutral electrolyte solutions. The asymmetric supercapacitor consisting of a MnO2 /HPC cathode and a HPC anode shows an excellent performance with energy and power densities of 15.3 Wh kg(-1) and 19.8 kW kg(-1) , respectively, at a cell voltage of 2 V. Results obtained herein demonstrate the excellence of MnO2 /HPC nanocomposites as energy storage material and open an avenue to fabricate the next generation supercapacitors with both high power and energy densities.

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“…The rate capability of MnO 2 /carbon composites (MnO 2 / C-240) were further compared with that of a series of MnO 2 /porous carbon composites including MnO 2 /hierarchically porous carbon [48], MnO 2 /graphitic disordered mesoporous carbon [49], MnO 2 /CMK-3 [42], and mesoporous MnO 2 /carbon aerogel [26]. As shown in Fig.…”

mentioning

confidence: 99%

Composites of MnO2 nanocrystals and partially graphitized hierarchically porous carbon spheres with improved rate capability for high-performance supercapacitors

Wang

Fan

et al. 2015

Carbon

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High pseudocapacitance of MnO2 nanoparticles in graphitic disordered mesoporous carbon at high scan rates

Cited by 87 publications

References 45 publications

Capacitance behavior of ordered mesoporous carbon/Fe2O3 composites: Comparison between 1D cylindrical, 2D hexagonal, and 3D bicontinuous mesostructures

Capacitance behavior of ordered mesoporous carbon/Fe2O3 composites: Comparison between 1D cylindrical, 2D hexagonal, and 3D bicontinuous mesostructures

Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

Composites of MnO2 nanocrystals and partially graphitized hierarchically porous carbon spheres with improved rate capability for high-performance supercapacitors

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