Two-Dimensional Carbon-Coated Graphene/Metal Oxide Hybrids for Enhanced Lithium Storage

Su, Yuezeng; Li, Shuang; Wu, Dongqing; Zhang, Fan; Liang, Haojun; Gao, Pengfei; Cheng, Chong; Feng, Xinliang

doi:10.1021/nn303091t

Cited by 402 publications

(293 citation statements)

References 49 publications

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“…46 In Fig. 6b, the C 1s core level is fitted using four components located at 281.2, 284.6, 286.4 and 288.9 eV, corresponding to C-Ti, C-C/C-H, C-O and O-C = O bonds, 6,47 respectively. High-resolution XPS spectra of Ti 2p and C 1s core levels of Ti 3 C 2 /TiO 2 -np (II) are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Room Temperature Oxidation of Ti₃C₂MXene for Supercapacitor Electrodes

Cao

Wang

et al. 2017

J. Electrochem. Soc.

159

100

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Two kinds of Ti 3 C 2 /TiO 2 hybrids were synthesized by room temperature oxidation methods, named as Ti 3 C 2 /TiO 2 -nanoparticles and Ti 3 C 2 /TiO 2 -nanowires, respectively. Effects of reaction time and concentration of NaOH solution on the microstructures and electrochemical performances of Ti 3 C 2 /TiO 2 composites were studied in details. When used as electrodes for supercapacitors, both Ti 3 C 2 /TiO 2 -nanoparticles and Ti 3 C 2 /TiO 2 -nanowires exhibit enhanced supercapacitive performances. The electrochemical measurement results show that the specific capacitances of Ti 3 C 2 /TiO 2 -nanoparticles and Ti 3 C 2 /TiO 2 -nanowires electrodes are 128 and 143 F/g at 2 mV/s, respectively, which are larger than that of Ti 3 C 2 MXene (91 F/g). Furthermore, after 6000 charge-discharge cycles at 5 A/g, 88% and 80% of the initial capacitances are retained for Ti 3 C 2 /TiO 2 -nanoparticles and Ti 3 C 2 /TiO 2 -nanowires, respectively. Therefore, this work not only enhances the understanding of the surface states and morphology structures of Ti 3 C 2 MXene at different reaction condition in the aqueous solutions, but also provides simple and facile ways to fabricate photocatalysts, 5-8 lithium-ion batteries 9-11 and supercapacitors. 12-14MXenes are produced by selective etching of "A" layers from M n+1 AX n (n = 1, 2, 3) phase, where M belongs to an early transition metal, A represents a IIIA or IVA element, and X is C and/or N. [15][16][17] The structures of the etched resultants are similar to the exfoliated graphite.15 Typically, MXenes are terminated by -OH, -O and/or -F surface groups (denoted as T x ), and so their general formula is M n+1 X n T x , 15,17,18 such as Ti 3 C 2 T x and Ti 2 CT x . MXenes show significant potential in energy storages benefiting from their layered structure, hydrophilic surfaces, outstanding electrical conductivity and excellent chemical stability. 10,12,13,[17][18][19][20] MXene-derived nanoribbons, formed in simultaneous oxidation and alkalization processes, also show high-performances in sodium and potassium ion batteries. 21 In addition, the electrochemical properties of MXenes and MXenesbased materials have been extensively investigated in aqueous 13,22,23 and nonaqueous electrolytes. 24,25 Notably, MXenes have been demonstrated to exhibit large pseudocapacitance, which is caused by ion intercalation between their two-dimensional nanosheets. 26,27 In order to satisfy the increasing strict requirements of energy storage devices, MXenes are motivated to exploit much better electrochemical performances. Recent studies reported that introduction of transition metal oxides into MXenes is an efficient way to improve the electrochemical properties in supercapacitors 28-31 and lithium-ion batteries 32,33 . Among the transition metal oxides, titanium dioxide (TiO 2 ) is one of the most widely investigated electrode materials, owing to its low cost, abundant availability and convenient synthesis in nanoscale sizes. [34][35][36][37] Many studies have reported different preparation...

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Section: Resultsmentioning

confidence: 99%

Room Temperature Oxidation of Ti₃C₂MXene for Supercapacitor Electrodes

Cao

Wang

et al. 2017

J. Electrochem. Soc.

159

100

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“…The strategies to develop alternative anode materials with improved capacity have been achieved for several decades. [1][2][3][4][5][6][7][8] Among them, nanoscale metal oxides, including MnO, [9] SnO 2 , [10,11] Co 3 O 4 , [12] NiO, [13] and Fe 3 O 4 , [14,15] used as anode active materials for LIBs have been paid much attention attributed to their promising theoretical capacity. However, in most cases, the capacity decays rapidly as cycled due to high electrical resistivity and mechanism failure.…”

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confidence: 99%

Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Yao

et al. 2017

Global Challenges

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the theoretical capacity of graphite electrodes is 372 mAh g −1 , resulted in an obstacle for their potential applications. The strategies to develop alternative anode materials with improved capacity have been achieved for several decades. [1][2][3][4][5][6][7][8] Among them, nanoscale metal oxides, including MnO, [9] SnO 2 , [10,11] Co 3 O 4 , [12] NiO, [13] and Fe 3 O 4 , [14,15] used as anode active materials for LIBs have been paid much attention attributed to their promising theoretical capacity. However, in most cases, the capacity decays rapidly as cycled due to high electrical resistivity and mechanism failure. [16] Molybdenum oxide (MoO 2 ) is different from other metal oxides. It possesses metallic conductivity (its electrical resistivity is 8.8 × 10 −5 Ω cm at 300 K in bulk sample), with a theoretical capacity as high as 836 mAh g −1 . [17] However, the capacity of bulk MoO 2 is low due to sluggish lithiation/delithiation kinetics. [17][18][19][20] On the other hand, the nanoporous structure constructed with lots of interconnect nanounits to form numbers of nanoscale pore provides adequate spaces for electrochemical reaction and connected pathways for ion diffusion. [21,22] The nano-MoO 2 porous structures have been synthesized by using mesoporous silica as hard templates, followed removing this hard templates by hydrofluoric acid, [23] or by a sulfur-assisted decomposition process. [24] The prepared MoO 2 porous materials have displayed improved capacity for LIBs. However, the capacity fade after charge/discharge process is attributed to the pure MoO 2 skeleton that will be possibly collapsed. The cycle stability needs to be improved further. It should be desired for the MoO 2 porous structure with flexible supports via retarding the pulverization from pure MoO 2 skeleton.Carbon nanomaterials, especially, graphene with large specific surface area and high toughness, are suitable for both substrates and supports for MoO 2 electrode active materials. However, owing to graphene being liable to stack together, it is difficult to prepare well distributed graphene templated metal oxide architectures. The strategies, including solid-state graphenothermal reduction method, [25] microwave-assisted hydrothermal process, [26] and soft-templated hydrothermal method, [27] have been used to synthesize MoO 2 /C nanocomposites, exhibiting promising performance for LIBs. In our present

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“…This results in higher conductivity than the disordered carbon-coated samples. The Raman spectra of RGO/C/ZnO lie between C/ZnO and RGO/ZnO, proving that the RGO/C/ZnO is successfully modified by both the reduced graphene oxide and sucrose-derived carbon (Figure 3b) [56][57][58][59][60].…”

Section: Resultsmentioning

confidence: 90%

Reduced graphene oxide/carbon double-coated 3-D porous ZnO aggregates as high-performance Li-ion anode materials

Wi¹,

Woo²,

Lee³

et al. 2016

Nano Online

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The reduced graphene oxide (RGO)/carbon double-coated 3-D porous ZnO aggregates (RGO/C/ZnO) have been successfully synthesized as anode materials for Li-ion batteries with excellent cyclability and rate capability. The mesoporous ZnO aggregates prepared by a simple solvothermal method are sequentially modified through distinct carbon-based double coating. These novel architectures take unique advantages of mesopores acting as space to accommodate volume expansion during cycling, while the conformal carbon layer on each nanoparticle buffering volume changes, and conductive RGO sheets connect the aggregates to each other. Consequently, the RGO/C/ZnO exhibits superior electrochemical performance, including remarkably prolonged cycle life and excellent rate capability. Such improved performance of RGO/C/ZnO may be attributed to synergistic effects of both the 3-D porous nanostructures and RGO/C double coating.

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Two-Dimensional Carbon-Coated Graphene/Metal Oxide Hybrids for Enhanced Lithium Storage

Cited by 402 publications

References 49 publications

Room Temperature Oxidation of Ti₃C₂MXene for Supercapacitor Electrodes

Room Temperature Oxidation of Ti₃C₂MXene for Supercapacitor Electrodes

Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Reduced graphene oxide/carbon double-coated 3-D porous ZnO aggregates as high-performance Li-ion anode materials

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Two-Dimensional Carbon-Coated Graphene/Metal Oxide Hybrids for Enhanced Lithium Storage

Cited by 402 publications

References 49 publications

Room Temperature Oxidation of Ti3C2MXene for Supercapacitor Electrodes

Room Temperature Oxidation of Ti3C2MXene for Supercapacitor Electrodes

Constructing MoO2 Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Reduced graphene oxide/carbon double-coated 3-D porous ZnO aggregates as high-performance Li-ion anode materials

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Room Temperature Oxidation of Ti₃C₂MXene for Supercapacitor Electrodes

Room Temperature Oxidation of Ti₃C₂MXene for Supercapacitor Electrodes

Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes