Hierarchically Porous 3D Freestanding Holey-MXene Framework via Mild Oxidation of Self-Assembled MXene Hydrogel for Ultrafast Pseudocapacitive Energy Storage

Sikdar, Anirban; Héraly, Frédéric; Zhang, Hao; Hall, Stephen; Pang, Kanglei; Zhang, Miao; Yuan, Jiayin

doi:10.1021/acsnano.3c11551

Cited by 15 publications

(1 citation statement)

References 67 publications

(114 reference statements)

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“…Therefore, combining single-layer or few-layer MXene with other substrate materials as a scaffold can help overcome the aggregation issue associated with layered materials. Ti 3 C 2 T x is one of the common types of MXenes, being distinguished by its chemical stability, and it is commonly employed as an electrode material for supercapacitors [25][26][27]. Ti 3 C 2 T x is obtained by the HF etching of Ti 3 AlC 2 , where T represents the surface functional groups (-OH/-F/-O) [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Construction of Monolayer Ti3C2Tx MXene on Nickel Foam under High Electrostatic Fields for High-Performance Supercapacitors

Zhang,

Chen,

Wei

et al. 2024

Nanomaterials

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Ti3C2Tx MXene, as a common two-dimensional material, has a wide range of applications in electrochemical energy storage. However, the surface forces of few-layer or monolayer Ti3C2Tx MXene lead to easy agglomeration, which hinders the demonstration of its performance due to the characteristics of layered materials. Herein, we report a facile method for preparing monolayer Ti3C2Tx MXene on nickel foam to achieve a self-supporting structure for supercapacitor electrodes under high electrostatic fields. Moreover, the specific capacitance varies with the deposition of different-concentration monolayer Ti3C2Tx MXene on nickel foam. As a result, Ti3C2Tx/NF has a high specific capacitance of 319 mF cm−2 at 2 mA cm−2 and an excellent long-term cycling stability of 94.4% after 7000 cycles. It was observed that the areal specific capacitance increases, whereas the mass specific capacitance decreases with the increasing loading mass. Attributable to the effect of the high electrostatic field, the self-supporting structure of the Ti3C2Tx/NF becomes denser as the concentration of the monolayer Ti3C2Tx MXene ink increases, ultimately affecting its electrochemical performance. This work provides a simple way to overcome the agglomeration problem of few-layer or monolayer MXene, then form a self-supporting electrode exhibiting excellent electrochemical performance.

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Section: Introductionmentioning

confidence: 99%

Construction of Monolayer Ti3C2Tx MXene on Nickel Foam under High Electrostatic Fields for High-Performance Supercapacitors

Zhang,

Chen,

Wei

et al. 2024

Nanomaterials

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Biomimetic Porous MXene Antibacterial Adsorbents with Enhanced Toxins Trapping Ability for Hemoperfusion

Wang,

Cao,

et al. 2024

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Abstract2D transition metal carbides and nitrides, i.e., MXene, are recently attracting wide attentions and presenting competitive performances as adsorbents used in hemoperfusion. Nonetheless, the nonporous texture and easily restacking feature limit the efficient adsorption of toxin molecules inside MXene and between layers. To circumvent this concern, here a plerogyra sinuosa biomimetic porous titanium carbide MXene (P‐Ti3C2) is reported. The hollow and hierarchically porous structure with large surface area benefits the maximum access of toxins as well as trapping them inside the spherical cavity. The cambered surface of P‐Ti3C2 prevents layers restacking, thus affording better interlaminar adsorption. In addition to enhanced toxin removal ability, the P‐Ti3C2 is found to selectively adsorb more middle and large toxin molecules than small toxin molecules. It possibly originates from the rich Ti‐deficient vacancies in the P‐MXene lattice that increases the affinity with middle/large toxin molecules. Also, the vacancies as active sites facilitate the production of reactive oxygen under NIR irradiation to promote the photodynamic antibacterial performance. Then, the versatility of P‐MXene is validated by extension to niobium carbide (P‐Nb2C). And the simulated hemoperfusion proves the practicability of the P‐MXene as polymeric adhesives‐free adsorbents to eliminate the broad‐spectrum toxins.

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Longevous Protic Hybrid Supercapacitors Using Bimetallic Prussian Blue Analogue/rGO‐Based Nanocomposite Against MXene Anode

Stephanie,

Park,

Hyun

et al. 2024

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MXenes exhibit a unique combination of properties—2D structure, high conductivity, exceptional capacity, and chemical resistance—making them promising candidates for hybrid supercapacitors (HSCs). However, the development of MXene‐based HSCs is often hindered by the limited availability of cathode materials that deliver comparable electrochemical performance, especially in protic electrolytes. In this study, this challenge is addressed by introducing a durable protic HSC utilizing a bimetallic Prussian Blue Analogue (PBA) decorated on reduced graphene oxide (rGO) as a nanocomposite cathode paired with a single‐layered Ti3C2Tx MXene (SL‐MXene) anode. The bimetallic PBA, specifically nickel hexacyanocobaltate (NiHCC), is utilized by virtue of its open and stable structure that facilitates efficient charge storage, leading to enhanced stability and energy storage capabilities. The resulting NiHCC/rGO//SL‐MXene cell demonstrates impressive performance, achieving a maximum specific energy of 38.03 Wh kg−1 and a power density of 20 666.67 W kg−1. Remarkably, the NiHCC/rGO//SL‐MXene HSC cell also exhibits excellent cycling stability without any loss even after 15 000 cycles while retaining ≈100% coulombic efficiency. This work underscores the potential of bimetallic PBA materials with conductive rGO backbone for overcoming the limitations of current MXene‐based protic HSCs, highlighting the significance of this work.

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Hierarchically Porous 3D Freestanding Holey-MXene Framework via Mild Oxidation of Self-Assembled MXene Hydrogel for Ultrafast Pseudocapacitive Energy Storage

Cited by 15 publications

References 67 publications

Construction of Monolayer Ti3C2Tx MXene on Nickel Foam under High Electrostatic Fields for High-Performance Supercapacitors

Construction of Monolayer Ti3C2Tx MXene on Nickel Foam under High Electrostatic Fields for High-Performance Supercapacitors

Biomimetic Porous MXene Antibacterial Adsorbents with Enhanced Toxins Trapping Ability for Hemoperfusion

Longevous Protic Hybrid Supercapacitors Using Bimetallic Prussian Blue Analogue/rGO‐Based Nanocomposite Against MXene Anode

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