MXene/RGO composite aerogels with light and high-strength for supercapacitor electrode materials

Shao, Liang; Xu, Jian; Ma, Jianzhong; Zhai, Bingyan; Liu, Ying; Xu, Ran; Ma, Zhonglei; Zhang, Guohong; Wang, Caiyun; Qiu, Jianhui

doi:10.1016/j.coco.2020.03.006

Cited by 89 publications

(41 citation statements)

References 26 publications

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“…Figure 2A displays the Raman scattering profiles for MXene, MoSe 2 , and MXene/MoSe 2 hybrids. The Raman shifts at 204, 388, 619, and 722 cm −1 are the characteristic MXene peaks, consistent with previous reports 60‐62 . No significant D and G bands were exhibited from the free carbon, suggesting that the samples were not degraded during etching 61 .…”

Section: Resultssupporting

confidence: 91%

Designing the MXene/molybdenum diselenide hybrid nanostructures for high‐performance symmetric supercapacitor and hydrogen evolution applications

et al. 2021

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Summary Engineering the physical characteristics of a novel Ti3C2 MXene/MoSe2 hybrid by a facile methodology is crucial for synergistic chemical interactions and improved aspects. Highly conductive Ti3C2 MXene, functioned as an outstanding support together with the active sites of MoSe2 in the hybrid structure, increases the active area and porosity to increase the insertion/abstraction of electrolyte ions. The synergistic MXene/MoSe2 hybrid‐based symmetric supercapacitor delivered an enhanced capacitance of 350 F g−1 with worthy solidity (93% of retained capacitance after 5000 cycles) and a good specific energy of 48 Wh kg−1 at a specific power of 500 W kg−1. MXene/MoSe2 unveiled fabulous electrocatalytic behavior of hydrogen evolution with overpotentials of 136 and 149 mV at 10 mA cm−2 and Tafel slopes of 88 and 83 mV dec−1 in acidic and base solutions, respectively. This work surfaces the way of designing distinct two‐dimensional (2D)/2D heterostructures for efficient energy storage/conversion applications.

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Section: Resultssupporting

confidence: 91%

Designing the MXene/molybdenum diselenide hybrid nanostructures for high‐performance symmetric supercapacitor and hydrogen evolution applications

et al. 2021

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“…This is because the distribution of Ti 3 C 2 T x in the R-Ti 3 C 2 T x /(ANF/PVA) EMI shielding composite film is relatively chaotic and disorderly, and more stress concentration points are easily generated when subjected to external forces. For D-Ti 3 C 2 T x /(ANF/PVA) EMI shielding composite films, the structure is directionally ordered parallel to the directional freezing direction, and its stress distribution is uniform, giving it high tensile strength and elongation at break [ 59 , 60 ]. In addition, when the amount of Ti 3 C 2 T x is 80 wt%, the tensile strength and elongation at break of the D-Ti 3 C 2 T x /(ANF/PVA) EMI shielding composite film stretched perpendicular to the directional freezing direction are 6.1 MPa and 1.7%, respectively, lower than those of D-Ti 3 C 2 T x /(ANF/PVA) EMI shielding composite film stretched parallel to the directional freezing direction, indicating that the mechanical properties of the D-Ti 3 C 2 T x /(ANF/PVA) EMI shielding composite films are anisotropic.…”

Section: Resultsmentioning

confidence: 99%

Flexible Ti ₃ C ₂ T _x /(Aramid Nanofiber/PVA) Composite Films for Superior Electromagnetic Interference Shielding

Zhang

Ruan

et al. 2022

Research

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Multifunctional electromagnetic interference (EMI) shielding materials would solve electromagnetic radiation and pollution problems from electronic devices. Herein, the directional freeze-drying technology is utilized to prepare the aramid nanofiber/polyvinyl alcohol aerogel with a directionally porous structure (D-ANF/PVA), and the Ti3C2Tx dispersion is fully immersed into the D-ANF/PVA aerogel via ultrasonication and vacuum-assisted impregnation. Ti3C2Tx/(ANF/PVA) EMI shielding composite films with directionally ordered structure (D-Ti3C2Tx/(ANF/PVA)) are then prepared by freeze-drying and hot pressing. Constructing a directionally porous structure enables the highly conductive Ti3C2Tx nanosheets to be wrapped on the directionally porous D-ANF/PVA framework in order arrangement and overlapped with each other. And the hot pressing process effectively reduces the layer spacing between the stacked wavy D-ANF/PVA, to form a large number of Ti3C2Tx-Ti3C2Tx continuous conductive paths, which significantly improves the conductivity of the D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film. When the amount of Ti3C2Tx is 80 wt%, the EMI shielding effectiveness (EMI SE) and specific SE (SSE/t) of D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film achieve 70 dB and 13790 dB·cm2·g-1 (thickness and density of 120 μm and 0.423 g·cm-3), far superior to random-structured Ti3C2Tx/(ANF/PVA) (R-Ti3C2Tx/(ANF/PVA)) composite film (46 dB and 9062 dB·cm2·g-1, respectively) via blending-freeze-drying followed by hot pressing technology. Meanwhile, the D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film possesses excellent flexibility and foldability.

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“…For instance, a freestanding MXene/rGO composite aerogel with spindle‐shaped 3D porous structure and high mechanical strength was prepared via a freeze‐drying method, by adding ascorbic acid (320 mg) into the mixture of GO dispersion (10 mL, 8 mg mL –1 ) and Ti 3 C 2 T x nanosheets dispersion (4 mL, 8 mg mL –1 ). [ 85 ] The freestanding aerogel, when used as a supercapacitor electrode, showed a capacitance of 233 F g –1 at 1 A g –1 and a capacitance retention of 91.01% after 10 000 cycles in 1 m H 2 SO 4 electrolyte.…”

Section: Chemical Assembly Methodsmentioning

confidence: 99%

“…Besides EDA, other reducing agents, such as sodium hydrogen sulfite (NaHSO 3 ), [82] hydroiodic acid [83,84] and ascorbic acid [85] have also been explored to assemble 3D MXenes. For instance, a freestanding MXene/rGO composite aerogel with spindle-shaped 3D porous structure and high mechanical strength was prepared via a freeze-drying method, by adding ascorbic acid (320 mg) into the mixture of GO dispersion (10 mL, 8 mg mL -1 ) and Ti 3 C 2 T x nanosheets dispersion (4 mL, 8 mg mL -1 ).…”

Section: Assembly Based On the Interaction Of Terminationsmentioning

confidence: 99%

Three‐Dimensional MXenes for Supercapacitors: A Review

Zhu

et al. 2022

Small Methods

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However, limited by their high contact resistance, insufficient charge storage, and low electrode density, the activated carbons only show an inadequate capacitance range of 60-200 F cm −3 . [7,8] In comparison, the pseudocapacitive materials, such as conducting polymers and metal oxides, exhibit higher capacitance based on their fast non-diffusion limited surface Faraday redox reactions, [9] whereas poor conductivity and unstable cycle performance restrict their wide-spectrum application. [10,11] Several efforts have been made to develop the intercalation pseudocapacitive electrode materials, which store charge via fast ion intercalation and thus combine the high energy density of batteries and the high power density of supercapacitors. [12,13] 2D transitional metal carbides/nitrides, also known as MXenes, have attracted much attention since firstly reported in 2011. [14] MXenes have a general formula of M n + 1 X n T x , where M is a transition metal, X is carbon or/and nitrogen, n can be an integer between 1 and 4, and T x stands for surface-terminating functional groups (-OH, -F, -O, etc.). [15,16] MXenes could be obtained by selectively etching the A atomic layer from their layered MAX phase precursors (M n + 1 AX n ) with different etchants. [14,17,18] Currently, more than 100 kinds of MXenes have been predicted, among which about 40 compositions have been experimentally synthesized and Ti 3 C 2 T x is the most studied member. Various compositions and ratios of M and X elements, together with different surface terminations, endow MXene materials with special and tunable structures and properties. As a result, they have rapidly aroused tremendous interest for various applications, including energy storage, [19][20][21][22][23] catalysis, [24] electromagnetic interference shielding, [25] water purification, [26] reinforcement for composites, [27] etc.More specifically, MXene materials are promising electrode materials for supercapacitors, as they have 2D lamellar structure, high electrochemically active surface, metallic-like electrical conductivity, tunable surface-terminating functional groups, good dispersibility in various solvents, and outstanding mechanical flexibility. [28][29][30] Due to their 2D structure and polar terminations, MXenes allow ions (e.g., H + , Li + , Na + ) to intercalate/de-intercalate fast between the layers. [20,31] In basic and neutral aqueous electrolytes, the intercalated ions are surrounded by water molecules, leading to an inner EDLC mechanism with common capacitances of 60-150 F g -1 , [32] while in H 2 SO 4 electrolyte, the intercalated H + protons can bond/ debond with the oxygen-containing terminations on the MXene Supercapacitors have the characteristics of high power density and long cycle life, but the low energy density limits their further development. The 2D transitional metal carbides/nitrides (MXenes) show great application prospects in the field of supercapacitors due to their superior volumetric capacitance, metallic-like conductivity, tunable surface termination...

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MXene/RGO composite aerogels with light and high-strength for supercapacitor electrode materials

Cited by 89 publications

References 26 publications

Designing the MXene/molybdenum diselenide hybrid nanostructures for high‐performance symmetric supercapacitor and hydrogen evolution applications

Designing the MXene/molybdenum diselenide hybrid nanostructures for high‐performance symmetric supercapacitor and hydrogen evolution applications

Flexible Ti ₃ C ₂ T _x /(Aramid Nanofiber/PVA) Composite Films for Superior Electromagnetic Interference Shielding

Three‐Dimensional MXenes for Supercapacitors: A Review

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MXene/RGO composite aerogels with light and high-strength for supercapacitor electrode materials

Cited by 89 publications

References 26 publications

Designing the MXene/molybdenum diselenide hybrid nanostructures for high‐performance symmetric supercapacitor and hydrogen evolution applications

Designing the MXene/molybdenum diselenide hybrid nanostructures for high‐performance symmetric supercapacitor and hydrogen evolution applications

Flexible Ti 3 C 2 T x /(Aramid Nanofiber/PVA) Composite Films for Superior Electromagnetic Interference Shielding

Three‐Dimensional MXenes for Supercapacitors: A Review

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Flexible Ti ₃ C ₂ T _x /(Aramid Nanofiber/PVA) Composite Films for Superior Electromagnetic Interference Shielding