Materials Today Physics
·
2024
·
IF 10
Mohamedazeem M. Mohideen,Abdul Qadir,Balachandran Subramanian,Seeram Ramakrishna,Yong Liu
The quest for non-precious electrocatalysts through biomass for energy applications has attracted keen interest, but optimization for fuel cells remains challenging. Herein, we have developed a nitrogen and sulfur-anchored MXene hybrid chitosan-derived carbon sphere (N,S-MXC) reporting for the first time as a novel oxygen reduction reaction (ORR) electrocatalyst. Interestingly, as the mass ratio of MXene to Chitosan varied by (1:2, 1:1, and 2:1), the microstructures of the as-prepared catalysts changed, which drastically influenced the corresponding ORR performance. Notably, when the mass ratio was maintained to be 1:2, Ti 3 C 2 nanoparticles were dispersed on the surface of the biomass carbon core shell. They created multimodal porous morphology that helps to facilitate faster electron transfer, resulting in a high onset-potential of 0.89 V and limiting current density of −4.2 mA/cm 2 as well as excellent durability with minimum half-wave potential loss of 2.3 mV after 5000 cyclic voltammetry (CV) cycles than benchmark Pt/C. In addition, the corresponding catalyst also possessed robust stability of 87.47 % and an excellent methanal poisoning tolerance effect in an alkaline medium. In a nutshell, this work paves the pathway for converting sea animal waste to develop porous carbon as supporting material for fuel cells that directly or indirectly support achieving carbon neutrality.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haoyu Wang,Ping Han,Ying Yu,Shaolong Han,Yue Qiao,Yuehan Li,Bin Sun,Zheng Gu
Conductive hydrogels have been extensively investigated and demonstrate promising applications in wearable and flexible sensors. However, their broader implementation in this field is hindered by the insufficient strain sensitivity, susceptibility to mechanical damage with limited self-recovery, and inadequate adhesion to human skin. Herein, we present a multifunctional MXene/TA@CNC electronic hydrogel patch (MTC e-patch) by integrating highly conductive two-dimensional (2D) transition metal carbides (MXene) and tannic acid-coated carboxylated cellulose nanocrystals (TA@CNC) with polyvinyl alcohol and borax. And dynamic three-dimensional (3D) network is formed through synergistic dynamic hydrogen bonding and dynamic borate ester linkages. The incorporation of TA@CNC effectively prevents the oxidation of MXene, thereby extending the operational lifespan of hydrogels. The flexible covalent crosslinked network, combined with the rigidity of TA@CNC, imparts the MTC e-patch with excellent electrical conductivity (1.62 S/m), superior mechanical strength (≈1.35 MPa, 930 %), robust adhesiveness (≈28 kPa), and high self-healing capability (92 %). The rapid (161 ms) and sensitive (Gauge factor = 4.39) sensing performance of the developed wearable sensor enables the precise detection of subtle human motions, such as swallowing, throat vibrations during speech, and pen strokes during writing. Even when damaged, the sensor continues to provide stable signal output, demonstrating significant potential for applications in smart wearables, electronic skins, and human–machine interfaces.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Lan Ding,Jing Xu,Zeyu Zhang,Kezhen Qi,Ge Jin
Electrocatalytic hydrogen evolution reaction (HER) via water splitting is a prospective technology for achieving the sustainable production of hydrogen. So, ruthenium-based electrocatalysts have been extensively studied. However, metallic ruthenium tends to agglomerate due to the high cohesive energy, resulting in decreased HER performance in practical usage. Introducing sufficient support for dispersing and immobilizing ruthenium-based species is a viable way to enhance the utilization efficiency. MXene-based materials with unique surface termination groups, superior chemical stability, high specific surface area and favorable electrical conductivity have received significant attention as low-cost carriers for the development of active catalysts in HER. Herein, nitrogen (N) and sulfur (S) atom-doped titanium carbide (Ti 3 C 2 ) quantum dots (QDs) were successfully synthesized as efficient carriers for anchoring ultra-small ruthenium nanoparticles (NPs) toward electrocatalytic HER. Electrochemical tests reveal that the resultant N,S-Ti 3 C 2 QDs/Ru displays superior HER performance with low overpotentials of 28, 25 and 56 mV at 10 mA cm −2 current density in 0.5 M H 2 SO 4 , 1 M KOH and 1 M PBS solutions, respectively. Such a low overpotential is comparable to most previously reported non-metallic catalysts, Ru-based electrocatalysts and commercial Pt/C. In addition, N,S-Ti 3 C 2 QDs/Ru displays extraordinarily long-term stability over a relatively wide pH range and is indeed a kind of pH-universal catalyst for hydrogen evolution. Furthermore, density functional theory (DFT) calculations demonstrate that the interactions between metal Ru and N,S-Ti 3 C 2 MXene QDs effectively regulate the electronic structure of the active site Ru, lowering the energy barrier of the electrocatalytic HER intermediate, thus dramatically enhancing the activity for N,S-Ti 3 C 2 QDs/Ru. This work proposes a novel approach to functionalize MXene quantum dots for use as low-cost electrocatalysts with promising practical applications in renewable energy conversion.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lu Tang,Huimin Yang,Huajing Wang,Yazhou Yang,Xiaoxia Wang,Gen Tang,Dawen Zeng
The abundant tunable functional groups and room-temperature sensing properties of MXenes have garnered increasing interest in the field of gas sensing. However, the majority of research has exclusively focused on the combined impact of external substances with MXenes functional groups, with limited exploration into the modulation of MXenes’ intrinsic functional groups. In this work, we successfully produced molten salt-modified Ti 3 C 2 T x MXene (M-Ti 3 C 2 T x ) with tunable oxygen-functionalized surfaces using the molten salt immersion method and employed it as a chemical resistive gas sensor to detect NO 2 at room temperature (RT). Using diverse analytical techniques, we propose the O−addition effect on the surface titanium atoms and the O−substitution effect on the edge carbon atoms, refining the existence form of –O functional groups as well as realizing the effective regulation of the intrinsic functional groups. With a high response (∼25.87%−100 ppm NO 2 , whose response value is five times higher than that of pristine Ti 3 C 2 T x ), relatively rapid response speed (∼99 s−25 ppm NO 2 ), high sensitivity (∼0.29 ppm −1 ), low detection limits (theoretical LoD is 3.3 ppm), good selectivity and long-term stability (maintain stable within 28 days) at RT, the sensor based on M-Ti 3 C 2 T x demonstrates excellent NO 2 sensing performance. To understand the sensing mechanism, density functional theory (DFT) calculations were conducted to explore adsorption behaviors. Theoretical analysis validates that M-Ti 3 C 2 T x has a stronger adsorption capacity for NO 2 (E ad = −1.149 eV) owing to the formation of covalent bond between the –O functional group and the nitrogen atom of NO 2 . The application of the molten salt can effectively modulate the intrinsic functional groups of MXenes, expanding the scope of MXenes surface modification engineering and creating new opportunities for enhancing the gas sensing capabilities of MXenes.
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Small
·
2025
·
IF 12.1
Yucheng Pan,Min Sang,Shilong Duan,Zimu Li,Zhentao Zhang,Shuai Liu,Jianpeng Wu,Hong Chen,Yuan Hu,Xinglong Gong
The ubiquitous mechanical and thermal damage in extreme environments puts new demands on protective equipment. At the same time, with the continuous development of electronic equipment, electromagnetic hazards and information leakage risks are increasing, so equipment with force/thermal/magnetic protection performance needs to be developed urgently. Herein, a shear thickened composite aerogel (MS) with host–guest structure is developed by a two-step reinforcement process involving unidirectional freeze casting and ultrasonic assisted penetration of shear thickening fluid (STF). An interweaved skeleton is established by introducing MXene nanosheets, thus improving the structure stability. Moreover, the MS composite with further reinforced structure is obtained through the synergetic enhancement of STF, which achieves high compressive strength (570 kPa) and superior impact resistance (80% impact dissipation). Meanwhile, MS composite shows reliable heat insulation and flame retardant ability, and the total heat release is as low as 4.8 kJ g −1 . Furthermore, MS demonstrates an efficient shielding performance of 45.5 dB at an extremely low MXene load of 0.43 wt%. As a result, this functionally integrated composite is proving to be a competitive candidate for resistance to impact damage, thermal threats and electromagnetic interference hazards in complex environments.
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DESALINATION
·
2024
·
IF 8.3
Yuchun Ren,Dandan Zhao,Fei Zhou,Yuan Liu,Chen Fu,Yongsheng Fu,Tao Gong,Zhenglian Wu,Xinyu Yang,Zefeng Cai
Lithium recovery from shale gas wastewater (SGW) is essential for the growth of a sustainable economy. However, traditional powder adsorbents suffer significant loss and poor recyclability, limiting their practical utility. Here, we fabricate an HMO/MXene/PSF adsorptive membrane, in which 2D MXene serves as the hydrogen bond interacting agent between H 1.33 Mn 1.67 O 4 (HMO) and polysulfone (PSF). Notably, MXene incorporation effectively mitigates Mn leaching due to the hydrogen bond interaction. Efficient lithium recovery from Sichuan Basin SGW is achieved, with a lithium adsorption capacity of 21.18 mg/g. After ten consecutive cycles of adsorption and desorption, the HMO/MXene/PSF membrane shows remarkable cyclic stability, with a negligible decrease in lithium adsorption capacity of merely 0.16 %. Filtration studies reveal that the membrane with a surface area of 12.56 cm 2 can effectively filter 160 mL of SGW. The stability of the membrane due to hydrogen bond interactions and the selective adsorption mechanism are further confirmed through DFT calculations. This work presents a novel concept for constructing a mixed matrix membrane for lithium extraction from SGW and is expected to inspire further efforts in developing LIS-based adsorbents for lithium recovery.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Peng Wang,Haohang Yuan,Baoluo He,Ruisheng Guo,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
The potential of organic coatings in antifouling applications has been well-documented. Beyond their exceptional antifouling effects, these coatings should also possess good mechanical strength and self-healing capabilities. Herein, a novel vinyl-based ionic liquid [VEMIM + ] [Cl – ] (IL) was in situ polymerized and then assembled onto the surface of liquid metal (GLM) nanodroplets to prepare GLM-IL. Subsequently, Ti 3 C 2 T x (MXene) was modified with GLM-IL nanodroplets to obtain GLM-IL/MXene composite, which acts as an efficient photon captor and photothermal converters and can be further composited with PU film (GLM-IL/MXene/PU). Notably, the composite film significantly increases by ∼117°C after exposure to 200 mW/cm 2 light irradiation. This increase is attributed to the high photothermal conversion efficiency of MXene and the excellent plasma effect of GLM-IL. Compared with pure PU, the GLM-IL/MXene/PU film shows a 50% improvement in tensile strength and above 85.8% healing efficiency with a local temperature increase. Additionally, the as-prepared GLM-IL/MXene/PU film reveals satisfactory antifouling properties, achieving a 99.7% reduction in bacterial presence and an 80.3% reduction in microalgae. This work introduces a novel coating with antifouling and self-healing properties, offering a wide range of applications in the fields of marine antifouling and biomedicine.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Lu Wang,Maozhang Tian,Wenfeng Song,Xinmin Song,Qun Zhang,Hao Shen,Yanyao Shi,Jun Zhang,Jingjie Hou,Saijie Song,Lutao Yang,Weifeng Lv
Problems occurring in oilfields after secondary oil recovery can include low oil content, difficulty in tracing, and high production costs. The use of two-dimensional nanomaterials can improve the efficiency of oil exploration and extraction. In this study, we designed a new nanofluid based on lecithin-modified MXene (lecithin@MXene-COOH) for directional oil extraction and tertiary oil recovery. MXene has good interfacial affinity, and 0.02 % lecithin@MXene-COOH can be effectively enriched at the oil–water interface. The nanofluid based on lecithin@MXene-COOH has excellent emulsifying properties, and we found that the optimal formulation has an emulsifying volume of 12.8 mL. The efficient enrichment of lecithin@MXene-COOH at the oil–water interface means that it can effectively define the position of oil droplets. The lecithin@MXene-COOH nanofluid has excellent oil displacement effect, and can efficiently drive oil, with an improvement of recovery efficiency of up to 15.95 % after the traditional flooding stage. This research has developed a new application of MXene-based nanomaterials, and the lecithin@MXene-COOH nanofluid is predicted to have a successful future in the field of oilfield tracing and extraction.
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ACS Nano
·
2025
·
IF 16
Yanhui Zhuang,Hao Yang,Yuhang Li,Yang Zhao,Huihua Min,Sheng Cui,Xiaodong Shen,Han-Yi Chen,Yifeng Wang,Jin Wang
Covalent organic frameworks (COFs) have shown promise as bifunctional catalysts to simultaneously mitigate shuttle effects and Li dendrite issues of lithium–sulfur (Li–S) batteries. However, the inherent low conductivity of the COFs has significantly limited their catalytic activity and stability. Herein, bifunctional catalytic activity and durability of the COF/MXene heterostructure are activated by tuning the surface curvatures of COFs interfaced with MXene. The increased curvature of COFs could induce enhanced electron delocalization and alter heterostructure geometry, which in turn strengthens lithium polysulfide adsorption, lowers energy barriers, and stabilizes catalytic sites to promote sulfur redox reactions. Concurrently, the hierarchical COF/MXene structure improves electrolyte penetration and wettability, facilitates rapid ion transport, and homogenizes the Li-ion flux distribution, thus achieving uniform lithium deposition. Consequently, the 1D-COF/MXene Li–S batteries demonstrate a high-rate capacity of 926 mA h g–1 at 4C, a stable cycling performance with a reversible capacity of 589 mA h g–1 at 3C after 500 cycles, and a high reversible capacity of 604 mA h cm–2 with a sulfur loading of 3.5 mg cm–2 under a low electrolyte-to-sulfur ratio of 10 μL mg–1. This work offers an efficacious approach to regulate catalytic activity and stability of catalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 10
·1-10
·
IF 2.8
Niu Shengtao,Xu Zhiqiang,Kang Xiaoya,Zhao Lei,Zou Rong,Liu Wenwu,Ran Fen
The problematic polysulfide shuttle effect, slow redox kinetics of lithium polysulfides conversion, and low conductivity impede the prospects of lithium-sulfur battery applications. To address these issues, a unique rod-like CoSe 2 nanoparticle decorated flake MXene (MXene@CoSe 2 ) emerges as a promising host material for the design of advanced batteries. Here, we use a hydrothermal synthesis strategy to grow CoSe 2 nanorods in situ on the surface of flake MXene. By comparing the electrochemical properties of MXene@CoSe 2 electrodes with Mxene@Co electrodes, it is determined that the MXene@CoSe 2 electrode could adsorb lithium polysulfides more efficiently while accelerating the redox kinetics of lithium polysulfides to suppress the shuttle effect. As a result, the initial specific capacity at Mxene@CoSe 2 cathode could reach 1, 050.6 mAh g −1 at 0.1 C, which reaches 560.8 mAh g −1 after 100 cycles and remains at 492.9 mAh g −1 after 1, 000 cycles at 1 C, with a low average decay rate of 0.302% per cycle.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Debin Cai,Shuai Wu,Zhen Tian,Li Guo,Yanzhong Wang
The self-assembled aerogels are considered as an efficient strategy to address the aggregation and restacking of Ti 3 C 2 T x MXene nanosheets for high-performance supercapacitors. However, the low mechanical strength of the MXene aerogel results in the structural collapse of the self-standing supercapacitor electrode materials. Herein, a low-cost melamine sponge (MS) absorbed different cations (H + , K + , Mg 2+ , Fe 2+ , Co 2+ , Ni 2+ and Al 3+ ), serves as a carrier and crosslinker for loading MXene hydrogel induced by the absorbed cations on the skeleton surface and the pores of MS, resulting in the high loading mass MXene aerogels with high mechanical strength. The experimental results show that the Mg-Ti 3 C 2 T x @MS aerogel exhibits the maximum area capacitance of 702.22 mF cm −2 at 3 mA cm −2 , and the area capacitance is still 603.12 mF cm −2 even at 100 mA cm −2 , indicating the high rate capability with a capacitance retention of 85.89 %. It is worth noting that the constructed asymmetric supercapacitor with activated carbon achieves high energy densities of 104.53 μWh cm −2 and 93.87 μWh cm −2 at 800 μW cm −2 and 7999 μW cm −2 , respectively. Furthermore, the asymmetric supercapacitor shows the high cycling stability with 90.2 % capacity retention after 10,000 cycles. This work provides a feasible strategy to prepare Ti 3 C 2 T x MXene aerogels with large layer spacing and high strength for high-performance supercapacitors.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huiqin Fan,Zejun Zhang,Xiaowen Wu,Shujuan Meng,Yong Xu,Di Wang,Fei Zhao,Jianyou Wang
Ion exchange membranes (IEMs) have a wider application in water purification, electrolytic process, and ion separation. The improvement of IEMs performance through sulfonation treatment is limited, which seriously affects their application. Therefore, the incorporation of two-dimensional MXene can serve as a new breakthrough for exploration. However, the size of MXene nanosheets has not received significant attention in the studies of preparing composite membranes. The focus of this work was to explore the effect of MXene nanosheets on IEMs from the perspective of nanosheet size. Specifically, by adjusting the sizes of MXene nanosheets using simple sonication treatment, the continuous ion transport channels were constructed by connecting non-conductive regions in the matrix owing to uniform distribution and abundant hydroxyl functional groups of MXene nanosheets. Afterwards, content regulation was supplemented to increase the distribution density of negatively charged MXene nanosheets in the matrix, thereby further increasing the migration rate of ions. Through this special synergistic regulatory effect, the performance of the composite membrane was maximally improved. Additionally, SPM membrane achieved better IEC and permeability, as well as lower membrane area resistance compared to pristine SPSF membrane. When applied to the ED process, SPM1.0%-1.5h membrane revealed higher desalination performance (90.4 %) and current efficiency (104.2 %) compared to pristine SPSF membrane (86.6 % and 99.7 %, respectively).
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