Functionalization of reduced graphene oxides by redox-active ionic liquids for energy storage

Cho, Sung Dae; Im, Jin Kyu; Kim, Han−Ki; Kim, Hoon Sik; Park, Ho Seok

doi:10.1039/c2cc31636f

Cited by 16 publications

(9 citation statements)

References 31 publications

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“…1) As proven by the linear dependence of capacitive peak currents on scan rates, [21] the surface-confined electrochemistry of RHEs implies that pseudocapacitive charging/discharging was triggered by a reversible redox transition of electroactive quinone moieties confined on the surface of RHEs (Figure 3 a and a1). The surface confinement of Lig nanocrystals on RHEs was verified by TEM analysis.…”

Section: Resultsmentioning

confidence: 91%

Superior Pseudocapacitive Behavior of Confined Lignin Nanocrystals for Renewable Energy‐Storage Materials

et al. 2014

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Strong demand for high-performance energy-storage devices has currently motivated the development of emerging capacitive materials that can resolve their critical challenge (i.e., low energy density) and that are renewable and inexpensive energy-storage materials from both environmental and economic viewpoints. Herein, the pseudocapacitive behavior of lignin nanocrystals confined on reduced graphene oxides (RGOs) used for renewable energy-storage materials is demonstrated. The excellent capacitive characteristics of the renewable hybrid electrodes were achieved by synergizing the fast and reversible redox charge transfer of surface-confined quinone and the interplay with electron-conducting RGOs. Accordingly, pseudocapacitors with remarkable rate and cyclic performances (~96 % retention after 3000 cycles) showed a maximum capacitance of 432 F g(-1), which was close to the theoretical capacitance of 482 F g(-1) and sixfold higher than that of RGO (93 F g(-1)). The chemical strategy delineated herein paves the way to develop advanced renewable electrodes for energy-storage applications and understand the redox chemistry of electroactive biomaterials.

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Section: Resultsmentioning

confidence: 91%

Superior Pseudocapacitive Behavior of Confined Lignin Nanocrystals for Renewable Energy‐Storage Materials

et al. 2014

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“…It is concluded that the C carbon value for RGO is much larger than those for CB and SWNT, as also reported previously. 24,25,[40][41][42] The POM/RGO nanohybrid materials, in which the weight ratio of TBA 3 [POM] was 33 wt%, were prepared by using the same method as that previously reported for the POM/SWNT nanohybrid materials. 12,14 Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced capacitor effects in polyoxometalate/graphene nanohybrid materials: a synergetic approach to high performance energy storage

et al. 2014

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“…Especially during the discharge process, contrary to h‐TiN, the R ct of m‐TiN sharply increases as soluble LiPS are reduced to the insulating solid phase (Li 2 S 2 /Li 2 S) at 2.0 and 1.7 V. The severe increase in R ct in this region is well matched with the low D Li value of m‐TiN in peak II. During the charge process, the Warburg's slope of h‐TiN is steeper than that of m‐TiN, indicating that the fast Li + ion movement and low R d in h‐TiN was promoted by the macropore . Furthermore, the R e of h‐TiN is higher than that of m‐TiN at the beginning of the discharge process, but is lower than that of m‐TiN (3.0 vs 10.0 Ω) at the end of the charge process.…”

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confidence: 93%

Approaching Ultrastable High‐Rate Li–S Batteries through Hierarchically Porous Titanium Nitride Synthesized by Multiscale Phase Separation

et al. 2018

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Porous architectures are important in determining the performance of lithium–sulfur batteries (LSBs). Among them, multiscale porous architecutures are highly desired to tackle the limitations of single‐sized porous architectures, and to combine the advantages of different pore scales. Although a few carbonaceous materials with multiscale porosity are employed in LSBs, their nonpolar surface properties cause the severe dissolution of lithium polysulfides (LiPSs). In this context, multiscale porous structure design of noncarbonaceous materials is highly required, but has not been exploited in LSBs yet because of the absence of a facile method to control the multiscale porous inorganic materials. Here, a hierarchically porous titanium nitride (h‐TiN) is reported as a multifunctional sulfur host, integrating the advantages of multiscale porous architectures with intrinsic surface properties of TiN to achieve high‐rate and long‐life LSBs. The macropores accommodate the high amount of sulfur, facilitate the electrolyte penetration and transportation of Li+ ions, while the mesopores effectively prevent the LiPS dissolution. TiN strongly adsorbs LiPS, mitigates the shuttle effect, and promotes the redox kinetics. Therefore, h‐TiN/S shows a reversible capacity of 557 mA h g−1 even after 1000 cycles at 5 C rate with only 0.016% of capacity decay per cycle.

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Functionalization of reduced graphene oxides by redox-active ionic liquids for energy storage

Cited by 16 publications

References 31 publications

Superior Pseudocapacitive Behavior of Confined Lignin Nanocrystals for Renewable Energy‐Storage Materials

Superior Pseudocapacitive Behavior of Confined Lignin Nanocrystals for Renewable Energy‐Storage Materials

Enhanced capacitor effects in polyoxometalate/graphene nanohybrid materials: a synergetic approach to high performance energy storage

Approaching Ultrastable High‐Rate Li–S Batteries through Hierarchically Porous Titanium Nitride Synthesized by Multiscale Phase Separation

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