Journal of Energy Storage
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2026
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IF 10.7
Cunxin Jia,Yijiao Zhang,Pu Zhang,Xinhuan Wang,Jiaxuan Hu,Jiayi Li,Xiaoliang Zhang,Yanming Wang,Jingbo Mu,Chunxia Wu
To address the challenges of poor cycling stability in manganese dioxide (MnO₂) and the tendency of MXene nanosheets to aggregate, this study designed and synthesized a ternary MXene/MnO₂@polypyrrole (PPy) composite for high-performance supercapacitor electrodes. Initially, conductive PPy was uniformly coated onto MnO₂ nanotubes through in situ polymerization, forming a core–shell structure. This coating effectively buffers the volumetric variations during electrochemical cycling. Subsequently, these MnO₂@PPy nanotubes were integrated with MXene nanosheets to construct a three-dimensional heterostructure. This architecture not only prevents the restacking of MXene but also establishes continuous conductive pathways throughout the electrode. Detailed material characterization confirms the formation of the target composite and demonstrates strong interfacial interactions between its components. The MXene/MnO₂@PPy electrode exhibits superior electrochemical performance, achieving a remarkable specific capacitance of 466.9 F g −1 when evaluated at a slow scan rate of 1 mV s −1 . This value is approximately double that of a pure MXene electrode. Furthermore, an asymmetric supercapacitor was assembled, employing this composite as the cathode and activated carbon as the anode. The assembled device delivers a notable energy density of 23.5 Wh kg −1 while demonstrating superior cycling durability. The electrode maintains a high capacitance retention ratio of 88.6% following 5000 consecutive galvanostatic charge-discharge cycles. This work demonstrates a rational material design strategy that successfully integrates multiple functional components, offering a synergistic effect for advanced energy storage applications.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yong-Sheng Tan,Heng-Heng Guo,Peng-Peng Duan,Wei-Kang Wang,Yi-Lin Lu,Dong-Hua Xie,Qi-Nian Wang,Xing Zhang
A CoMn 2 O 4 /MXene hybrid catalyst was rationally constructed to overcome the sluggish redox kinetics and inefficient interfacial electron transfer. • MXene functions not only as a conductive scaffold but also as an interfacial electronic modulator. • MXene-mediated electronic coupling promotes high-valent metal-oxo species as the dominant reactive intermediates. • Toxicity evaluation confirmed substantially reduced ecotoxicity of the treated BPA-containing water. Selective nonradical oxidation via high-valent metal-oxo (HVMO) species represents a promising yet mechanistically underexplored pathway for eliminating emerging contaminants. Here, a CoMn 2 O 4 /MXene (CMM) hybrid catalyst was rationally constructed to overcome the sluggish redox kinetics and inefficient interfacial electron transfer, which constrain HVMO species generation in spinel oxide/peroxymonosulfate (PMS) systems. MXene acts as both a conductive scaffold and interfacial electronic modulator, accelerating CoMn 2 O 4 -PMS charge transfer and steering PMS activation toward selective nonradical oxidation. The optimized CMM catalyst achieves complete bisphenol A removal within 5 min ( k = 0.98 min −1 ), nearly double the rate of pristine CoMn 2 O 4 . In addition, this system exhibited broad pollutant degradation, high PMS utilization efficiency, wide pH adaptability, and robust tolerance to complex water matrices. Combined experimental and theoretical analyses reveal that MXene-mediated electronic coupling promotes HVMO species as the dominant reactive intermediates. Toxicity evaluation using three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy and mung bean germination assays confirmed substantially reduced ecotoxicity of the treated BPA-containing water. Continuous flow operation further demonstrated near-complete BPA removal over 6 h, underscoring practical scalability. This work highlights interfacial electronic regulation as an effective strategy for engineering HVMO-mediated routes in advanced water purification. Download: Download high-res image (372KB) Download: Download full-size image
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
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IF 8.3
Ling-qiao Tang,Hao-wen Zhang,Qiong Wu,Di-wen Jiang,Li Wang,Guo-liang Liu,Hai-jun Chen,Zong-kai Yan,Zhe-sheng Feng,Yan Wang
Due to the high electrical conductivity, large specific surface area, and abundant hydrophilic functional groups, MXene-based composites have garnered significant attention as candidate functional materials for humidity sensing. Nevertheless, it remains challenging to simultaneously achieve superior sensitivity, fast response kinetics, and reliable printability in flexible humidity sensors. Herein, a flexible printed humidity sensor based on a Sm 2 O 3 -modified MXene composite was developed, which features a hierarchical nanoflower architecture constructed via solvothermal synthesis. This architecture effectively suppresses MXene restacking while providing abundant mesoporous channels and interfacial sites, facilitating the adsorption and diffusion of water molecules. To further enhance the humidity response, NaCl was introduced to promote ionic conduction. The resulting sensor exhibits rapid response and recovery times (4.9 s and 4.3 s, respectively) and a large capacitance variation of 3357.7% over a wide relative humidity range (11-97% RH). In addition, the sensor demonstrates ultralow hysteresis, favorable repeatability, and excellent long-term stability, with negligible capacitance fluctuation after 10 days of storage. Moreover, proof-of-concept demonstrations were performed for non-contact finger proximity sensing, human respiration monitoring, plant microenvironment tracking, and skin-interfaced humidity detection, demonstrating the potential versatility of the proposed sensor. Collectively, this study presents a promising strategy for fabricating high-performance flexible humidity sensors, offering broad prospects for wearable health monitoring and intelligent human-machine interaction in next-generation Internet of Things systems.
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ACS Applied Materials & Interfaces
·
2026
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IF 7.8
Zhang YaXi,Liang Jin,Zeng ZiQuan,Zhang Bin,Li Lu,Zhang Li,Chen HongHui
The development of highly efficient and stable bifunctional non-precious metal electrocatalysts is of critical importance for reducing the costs associated with hydrogen production through water electrolysis. In this work, a self-supporting electrode material is designed through an interfacial and high-entropy synergistic strategy. First, this involves loading MXene onto nickel foam to achieve interfacial modification, followed by the in situ growth of a quintuple high-entropy phosphide, resulting in the composite MX@CoNiZnFeMnP/NF. This design enables multiscale synergistic enhancement: at the atomic scale, the introduction of Mn, in synergy with high-entropy effects, optimizes the electronic structures of active sites; at the nanoscale, a highly conductive MXene network facilitates rapid charge transfer; at the micrometer scale, multi-level flower-like hierarchical architectures are developed, significantly enlarging the active surface area and improving mass transport. In 1.0 M KOH, the as-prepared catalyst exhibits excellent bifunctional performance, achieving overpotentials of just 73 mV at 10 mA cm –2 for the hydrogen evolution reaction and 210 mV at 50 mA cm –2 for the oxygen evolution reaction, along with Tafel slopes of 88 and 22 mV dec – 1 , respectively. When applied to overall water splitting, it reaches 10 mA cm – 2 at a cell voltage of only 1.43 V and demonstrates remarkable durability over 70 h of continuous operation. This work offers new insights into the design of high-performance non-noble-metal water-splitting catalysts through multiscale synergistic engineering.
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Journal of Energy Storage
·
2026
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IF 10.7
Yunhao Wu,Yizhan Gao,Jiaxuan Li,Zhen Wang,Zhigang Shao,Juan Zhang,Jianling Li
2D layered MXene, which holds multiple outstanding properties, like large specific surface area, abundant functional groups, and ultra-high electronic conductivity, have been an attractive anode material for lithium-ion energy storage. However, its practical application is greatly hindered by its limited capacity. Aiming at addressing this problem, this article innovatively proposes to mix NH 4 PF 6 with MXene for sintering, achieving P-doping between MXene layers and the transformation of Ti O and Ti-O-P functional groups. After 1700 cycles of 150 mA g −1 , the modified material still has a high specific capacity of over 250 mAh g −1 , and after 800 cycles of 1500 mA g −1 high current, it still has a capacity retention rate of over 100%. The in-situ XRD, XPS, DFT calculations and other methods have been used to demonstrate that the uniformly distributed phosphorus rich functional groups between MXene layers significantly expand the interlayer spacing, provide more active sites for lithium-ion storage, effectively promote Li + adsorption, and improve capacity and rate performance.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Qingbo Zhang,Zhenxuan Ma,Jiaguang Zheng,Ao Xia,Cong Li,Panpan Zhou
This study presents the synthesis of novel Mg(BH 4 ) 2 @V 2 C, Mg(BH 4 ) 2 @Nb 2 C and Mg(BH 4 ) 2 @Ti 3 C 2 composites using a solution-based nanoconfinement strategy, achieving robust architecture of Mg(BH 4 ) 2 onto Mxene structures. Among these composites, the Mg(BH 4 ) 2 @V 2 C composite exhibited an initial dehydrogenation temperature of 76.4 °C and released 9 wt% hydrogen at 300 °C, which exhibited the optimal hydrogen release behavior. Its two-step dehydrogenation activation energies (104.44 kJ/mol and 118.52 kJ/mol) were significantly lower than those of pure Mg(BH 4 ) 2 , showing improved dehydrogenation kinetics. After four absorption-desorption cycles, the composite could still desorb 4.9 wt% hydrogen, demonstrating excellent cycling stability. Further structural investigations revealed that V 2 C actually acted as a “functionalized” matrix, which improved hydrogen storage through a combination of nanoconfinement and catalytic effects, promoting both hydrogen desorption and absorption. This work provides critical insights for designing high-performance hydrogen storage materials and advances the development of next-generation storage systems.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 6
·e70241
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IF 3.4
Wei Wan,Yanting Wang,Dongmei Xie,Jingjing Su,Junrong Luo,Chaobing Liao,Yuejun Ouyang
Flexible dielectric materials with elevated dielectric constants and enhanced electrical breakdown resistance are critical for energy storage and wearable electronics. Herein, we developed a dual-strategy approach to enhance the dielectric performance of polyvinyl alcohol (PVA) based composites: (1) surface modification of Ti 3 C 2 T x MXene via H 2 O 2 oxidation to construct insulating TiO x coatings, and (2) structural engineering via a three-layer sandwich design. The MXene@TiO x /PVA interlayer was confined between pure PVA barrier layers using sequential solution casting. Systematic characterization confirmed the formation of amorphous TiO x coatings that effectively mitigates dielectric dissipation while improving voltage endurance. Furthermore, the sandwiched structure construction further improved these properties, leading to superior dielectric properties. The optimized composite with 2 wt.% Ti 3 C 2 T x MXene@TiO x in the interlayer demonstrated a dielectric constant of 12.62 (at 100 Hz) with ultralow loss tangent of 0.059, while achieving a breakdown strength of 194.2 kV/mm and an energy density of 2.25 J/cm 3 . This synergistic strategy of surface passivation and structural engineering provides a scalable pathway for designing eco-friendly dielectric composites with balanced electrical performance.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Qi Liu,Chuan Shi,Ke Wang,Chengyao Zhao,Hong Wang
Limited mass transfer in heterogeneous environments has posed a great challenge to the removal of environmentally persistent polycyclic aromatic hydrocarbons (PAHs) from soil. This work presents Mxene-derived TiO 2 /MnO 2 /MnFe 2 O 4 -βCD (TMMF-βCD) micromotors capable of self-propulsion for efficient on-the-move soil purification. A thermal annealing process was used to convert Ti 3 C 2 T x MXene into multilayer TiO 2 , followed by in-situ growth of MnO 2 , exfoliation, and functionalization with magnetic MnFe 2 O 4 and βCD-SH. Coupling self-propulsion and host-guest complexation effect induced by the βCD-SH modification, the micromotors can efficiently trap PAHs on their surface. The kinetic process of soil decontamination monitored by in-situ electrochemical impedance spectroscopy (in-situ EIS) and distribution of relaxation times (DRT) unveiled the effective migration of micromotors in the heterogenous environment and the dynamic capture of PAHs by the propelled micromotors. The phenanthrene (PHE) removal efficiency of propelled micromotors was more than 4.77 and 38.78 times that of static micromotors and propelled βCD-unmodified micromotors. The removal efficiency could reach 98.82% at 4 mg kg -1 of PHE and maintained beyond 90% within PHE concentrations of 2~20 mg kg -1 . We anticipate this proof-of-concept study would shed light on treating PAHs-contaminated soil with synthetic micromotors.
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Materials Today Communications
·
2025
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IF 4.5
Ao Men,Meng Cai,Cong Cai,Xiaoqiang Fan
The application of MXenes in organic coatings has been limited due to their tendency to agglomerate in polymer matrices, which is primarily caused by poor interfacial interactions with the polymer, and their susceptibility to oxidation under ambient conditions, resulting from the exposed Ti atoms on the surface. Here, Ti 3 C 2 T x MXene nanosheets were covalently modified with ionic liquids to prepare functionalized hybrid materials, which were subsequently incorporated as fillers into waterborne epoxy resin. The amine-functionalized ionic liquids improve the interaction between Ti 3 C 2 T x MXene and the polymer matrix, enhancing dispersion and reducing oxidation by minimizing its environmental exposure. Corrosion resistance and tribological behaviors demonstrated that the composite coating exhibited superior anti-corrosion performance, achieving a five-fold increase in the lowest frequency impedance modulus, and enhanced wear resistance, with a 64.93 % reduction in wear rate. These improvements are ascribed to the labyrinthine effect generated by the uniform dispersion of Ti 3 C 2 T x MXene nanosheets and the enhanced mechanical properties of the coating, stemming from improved interfacial compatibility with the resin. This work presents a green modification strategy for Ti 3 C 2 T x MXene, offering a viable approach to enhance its practical application in organic coatings. It also outlines potential future research directions, including further optimization of the MXene-resin interface and exploration of alternative ionic liquids for functionalization.
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Materials Today Physics
·
2026
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IF 9.3
Kexun Li,Fangyu Shi,Yanxia Wu,Min Zhao,Ying Liu
Modulating the electromagnetic properties of Ti 3 C 2 T x MXene to produce an ideal multifunctional and efficient microwave absorbent is a challenging research hotspot. Although the atomic layer deposited transition magnetic metal nanostructures are a feasible strategy, the effects of the components and microstructure of the introduced magnetic nanostructure on the electromagnetic wave absorption performances of the MXene are still far from clear. Here, the Fe element has been selected as the modifier, and a heterostructure Fe/Ti 3 C 2 T x MXene hybrid is constructed by the atomic layer deposition of Fe nanoparticles on the Ti 3 C 2 T x nanosheets. The influences of the deposition cycles on the chemical composition, microstructure, electromagnetic response characteristics, and microwave absorption properties are investigated. The results show that the decoration of Fe nanoparticles enables a tunable electromagnetic performance. The Fe/Ti 3 C 2 T x MXene hybrid achieves an optimal attenuation with the minimum reflection loss of -82.94 dB at a small thickness of 1.16 mm, corresponding with an effective absorption bandwidth of 3.76 GHz. The strong microwave absorption is attributed to the dielectric-magnetic synergy in the MXene and Fe nanoparticles, which provides excellent impedance matching, interfacial and dipolar polarization loss, and magnetic resonance loss. Specifically, the hybrid endows a low Fe content of 2.66 wt%. This is important for the design of a lightweight absorber with high attenuation efficiency.
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MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Yun Zhou,Yunxia He,Tianruo Zhang,Yong Xu,Keming Qu,Zhengguo Cui,Jianlei Chen
A molecularly imprinted electrochemical sensor (MIPs/MXene/GCE) was fabricated for the determination of chloramphenicol (CAP) in aquaculture seawater. MXene nanosheets were first drop-cast on a glassy carbon electrode (GCE) to accelerate electron transfer, followed by electro-polymerization of o -phenylenediamine around CAP templates to form a thin recognition film. After systematic optimization of MXene loading, elution cycles (20 CV scans), buffer pH (6.0), and adsorption time (10 min), the sensor exhibited two linear ranges, 0.1–5 μM and 5–200 μM, with a limit of detection of 0.017 μM. In spiked seawater samples, recoveries ranged from 90.4% to 105.2%. The innovative sensor provided rapid, selective, and robust quantification of trace CAP in complex saline matrices, thereby offering a practical tool for on-site antibiotics monitoring in mariculture environments.
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JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Deng Li,Yan Li,Yingxi Zhu,Zhou Li,Die Gao,Jia Zeng,Dan Li,Xiaodan Hu,Jiahao Lin,Xiongwei Yin,Famin Ke,Wei Ren,Dandan Wang
A MXene-based molecularly imprinted polymer (MXMIP) composite was developed for the enrichment and detection of puerarin and its metabolites in complex biological samples. As an ideal substrate material, MXene can make the recognition sites within the MIP matrix more easily exposed compared to conventional MIP. Through the operation of the "dual screening" mechanism, MXMIP combines interaction enhancement with molecular recognition, significantly enhancing the adsorption capacity and efficiency of this material. The successful synthesis of the composite was confirmed by comprehensive characterization of structure and properties. MXMIP achieved a maximum adsorption capacity of 3.70 mg∙g –1 , higher than conventional MIP (2.24 mg∙g –1 ) and MXene alone (1.74 mg∙g –1 ). The adsorption capacity of MXMIP was 1.65 times that of conventional MIP and 2.12 times that of MXene. In selective adsorption experiments, MXMIP shows excellent specificity toward puerarin, with selectivity factors ranging from 1.33 to 10.4 relative to structural analogs, and achieved an imprinting factor of 6.46. The hydrogen bonding interactions between MXMIP and puerarin were confirmed by ultraviolet spectroscopy, Fourier transform infrared spectroscopy, and density functional theory simulations. MXMIP was successfully applied to enrich and detect puerarin and its metabolites in biological samples. LC-MS/MS analysis showed that the mass charge ratios of MXMIP adsorbed samples were 415.09, 447.13, 253.05 and 255.23, respectively, corresponding to puerarin and its metabolites (dihydroxypuerarin, daidzein and dihydrodaidzein). This study provides a new approach for synthesizing highly selective molecularly imprinted polymers that effectively address the problem of binding site interception.
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