Fast assembly of MXene hydrogels by interfacial electrostatic interaction for supercapacitors

Peng, Mengke; Yang, Weizu; Li, Longbin; Zhang, Kaiyang; Wang, Li; Hu, Ting; Yuan, Kai; Chen, Yiwang

doi:10.1039/d1cc04574a

Cited by 29 publications

(18 citation statements)

References 24 publications

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“…[ 6–10 ] MXenes are known for their variety of surface terminal groups, excellent aqueous processability, and high electrical conductivity. [ 6–10 ] Extensive studies have focused on practical applications of MXenes for energy storage, [ 11–18 ] electromagnetic wave shielding, [ 19–22 ] layer‐by‐layer functional coatings, [ 23–25 ] nanocomposites, [ 26–28 ] hydrogels with 3D networks, [ 17,29 ] optoelectronic devices, [ 30,31 ] sensors, [ 23,32 ] catalysis, [ 33 ] and biomedical applications. [ 34,35 ]…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10] MXenes are known for their variety of surface terminal groups, excellent aqueous processability, and high electrical conductivity. [6][7][8][9][10] Extensive studies have focused on practical applications of MXenes for energy storage, [11][12][13][14][15][16][17][18] electromagnetic wave shielding, [19][20][21][22] layer-by-layer functional coatings, [23][24][25] nanocomposites, [26][27][28] hydrogels with 3D networks, [17,29] optoelectronic devices, [30,31] sensors, [23,32] catalysis, [33] and biomedical applications. [34,35] One limitation to the widespread use of MXenes is that they are prone to oxidation, especially in their commonly used aqueous colloidal state.…”

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confidence: 99%

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The Role of Antioxidant Structure in Mitigating Oxidation in Ti₃C₂T_x and Ti₂CT_x MXenes

Zhao

Cao

Coleman

et al. 2022

Adv Materials Inter

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carbide MXenes (e.g., Ti 3 C 2 T x , Ti 2 CT x , V 2 CT x , Nb 2 CT x , etc.) are synthesized from their ceramic MAX phase precursor (with a formula of M n+1 AX n , where A is a group 13 or 14 element) by selectively etching the A phase using hydrofluoric acid (HF) or fluoride-containing aqueous solutions. [6][7][8][9][10] MXenes are known for their variety of surface terminal groups, excellent aqueous processability, and high electrical conductivity. [6][7][8][9][10] Extensive studies have focused on practical applications of MXenes for energy storage, [11][12][13][14][15][16][17][18] electromagnetic wave shielding, [19][20][21][22] layer-by-layer functional coatings, [23][24][25] nanocomposites, [26][27][28] hydrogels with 3D networks, [17,29] optoelectronic devices, [30,31] sensors, [23,32] catalysis, [33] and biomedical applications. [34,35] One limitation to the widespread use of MXenes is that they are prone to oxidation, especially in their commonly used aqueous colloidal state. Prior studies have demonstrated that MXenes undergo chemical reaction with water and strong oxidants, resulting in their structural and chemical degradation over time, most commonly leading to formation of transition metal oxides. [36,37] This phenomenon of rapid MXene oxidation and degradation is currently not wellunderstood and is rarely discussed in reports focused on MXene applications, even though oxidation significantly changes performance-related properties. Indeed, low oxidation stability threatens to restrict both the shelf life of MXene dispersions and the product lifetime for MXene-based devices. Multiple studies have confirmed that oxidation results in the degradation of the MXene's 2D structure and loss of functional properties. Ti 3 C 2 T x and Ti 2 CT x nanosheets in their aqueous colloidal state and in functional films can react with water molecules, resulting in the formation of titanium dioxides (TiO 2 ) and amorphous carbon. [36][37][38][39] Oxidation rates of MXene nanosheets dispersed in water were found to be a function of temperature, solution pH, exposure to 800 nm laser and ultraviolet light, and the presence of radical-forming chemical oxidants such as hydrogen peroxide and ozone. [36,[40][41][42] In addition to dispersed nanosheets, dried MXene nanosheet powders and MXene-based devices are also prone to gradual degradation and worsened electrical properties. [36,43,44] Naguib et al. and others reported that MXene oxidation starts from nanosheet edges; thus, large nanosheets may have better oxidation stability than smaller ones. [45,46] MXene oxidation is also dependent on intrinsic nanosheet properties,

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

The Role of Antioxidant Structure in Mitigating Oxidation in Ti₃C₂T_x and Ti₂CT_x MXenes

Zhao

Cao

Coleman

et al. 2022

Adv Materials Inter

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“…Gelation is an useful method for converting into 3D bulk. [ 19 ] Upon heating, Fe(NO 3 ) 3 ·9H 2 O will be dehydrated into ferric oxide and then atomic iron will be formed in the reducing atmosphere with H 2 . Some iron sites are dispersed on the surface and some of them are built into the structure of the precursor (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Tailoring Conductive 3D Porous Hard Carbon for Supercapacitors

Sun

et al. 2022

Energy Tech

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Hard carbon has attracted great attention for energy storage owing to low cost and extremely high microporosity, however, hindered by its low electrical conductivity. The common strategy to improve the conductivity is through graphitization process which requires temperatures as high as 3000 °C and inevitably destroys the porous structure. Herein, a balance between the specific surface area and electrical conductivity in a 3D porous hard carbon by in situ iron‐catalyzed graphitization process together with the Si–O–Si network is successfully achieved. The Fe can accelerate the localized graphitization at relatively low temperature (1000 °C) to form nanographite domains with enhanced conductivity, while the Si–O–Si network contributes to generating a 3D porous structure. As a result, the optimized hard carbon exhibits a 3D interconnected and hierarchical porous structure with extremely high specific surface area (2075 m2 g−1) and excellent electrical conductivity (12 S cm−1) which is comparable with that of artificial graphite. And thus, high capacitance of 315 F g−1 and excellent rate capability (174 F g−1 at 40 A g−1) are simultaneously achieved when used as electrodes for supercapacitors. The strategy is promising to build hard carbon materials with well‐tuned properties for high‐performance energy storage.

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“…Hydrogel is a hydrophilic polymeric network of three‐dimensional (3D) cross‐linked structures that retain a significant amount of water [1, 2]. The soft swollen polymer networks formed as a result of physical or chemical cross‐linking show hydrophobic effects [2], electrostatic interactions [2–5], hydrogen bond interactions [6, 7], covalent bonds [8–11], and metal coordination chemistry [12–34]. Hydrogels can be tailored to achieve various cross‐linking densities, mechanical properties, and porous structures through various cross‐linking mechanisms and functional groups.…”

Section: Introductionmentioning

confidence: 99%

Natural polymer‐based adhesive hydrogel for biomedical applications

Long

Xie

2022

Biosurface and Biotribology

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Hydrogel is a polymer network system that can form a hydrophilic three‐dimensional network structure through different cross‐linking methods. In recent years, hydrogels have received considerable attention due to their good biocompatibility and biodegradability by introducing different cross‐linking mechanisms and functional components. Compared with synthetic hydrogels, natural polymer‐based hydrogels have low biotoxicity, high cell affinity, and great potential for biomedical fields; however, their mechanical properties and tissue adhesion capabilities have been unable to meet clinical requirements. In recent years, many efforts have been made to solve these issues. In this review, the recent progress in the field of natural polymer‐based adhesive hydrogels is highlighted. The authors first introduce the general design principles for the natural polymer‐based adhesive hydrogels being used as excellent tissue adhesives and the challenges associated with their design. Next, their usages in biomedical applications are summarised, such as wound healing, haemostasis, nerve repair, bone tissue repair, cartilage tissue repair, electronic devices, and other tissue repairs. Finally, the potential challenges of natural polymer‐based adhesive hydrogels are presented.

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Fast assembly of MXene hydrogels by interfacial electrostatic interaction for supercapacitors

Abstract: A simple and fast method for preparing MXene hydrogels is proposed by introducing protonated thionine molecules into MXene dispersion through electrostatic interaction. Such 3D hydrogel effectively suppressed restacking, oxidation, and...

Cited by 29 publications

References 24 publications

The Role of Antioxidant Structure in Mitigating Oxidation in Ti₃C₂T_x and Ti₂CT_x MXenes

The Role of Antioxidant Structure in Mitigating Oxidation in Ti₃C₂T_x and Ti₂CT_x MXenes

Tailoring Conductive 3D Porous Hard Carbon for Supercapacitors

Natural polymer‐based adhesive hydrogel for biomedical applications

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Fast assembly of MXene hydrogels by interfacial electrostatic interaction for supercapacitors

Abstract: A simple and fast method for preparing MXene hydrogels is proposed by introducing protonated thionine molecules into MXene dispersion through electrostatic interaction. Such 3D hydrogel effectively suppressed restacking, oxidation, and...

Cited by 29 publications

References 24 publications

The Role of Antioxidant Structure in Mitigating Oxidation in Ti3C2Tx and Ti2CTx MXenes

The Role of Antioxidant Structure in Mitigating Oxidation in Ti3C2Tx and Ti2CTx MXenes

Tailoring Conductive 3D Porous Hard Carbon for Supercapacitors

Natural polymer‐based adhesive hydrogel for biomedical applications

Contact Info

Product

Resources

About

The Role of Antioxidant Structure in Mitigating Oxidation in Ti₃C₂T_x and Ti₂CT_x MXenes

The Role of Antioxidant Structure in Mitigating Oxidation in Ti₃C₂T_x and Ti₂CT_x MXenes