DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Feifei Nie,Hui Zhao,Shuhui Liu,Yuanhao Li,Huijiao Zhang,Mingxing Wu,Kezhong Wu
The different surface terminals, sizes, and sheet quality of laminated 2D-Ti 3 C 2 -MXenes were prepared by selective etching intermediate Al atoms layer form the strongly bonded compound Ti 3 AlC 2 as precursor at low temperature using different etchants of HF, HF + HCl, LiF + HCl, and NH 4 HF 2 for 24 h, respectively. Then, 2D-Ti 3 C 2 -MXenes were further instead of traditional Pt as counter electrodes (CEs) in triiodide reduction for dye-sensitized solar cells (DSSCs). The selection of different etchant directly affects the properties and performance of the laminated 2D-Ti 3 C 2 -MXenes catalyst. Herein, the DSSCs with 2D-Ti 3 C 2 -MXenes CEs yielded power conversion efficiencies (PCE) of 7.15 % (HF-), 6.06 % (HF + HCl-), 6.38 % (LiF + HCl-), and 6.05 % (NH 4 HF 2 -) for regenerate traditional I 3 − /I − shuttles via the photocurrent-voltage ( J - V ) test, respectively. The outstanding electrocatalytic performances of laminated 2D-Ti 3 C 2 -MXenes can be attributed to the formation of regular inter-stratification structures by etching to expose larger specific surface areas and further generate more catalytic reaction sites, as well as the acceleration of I 3 − /I − shuttle diffusion channels by adjusting the interlayer d -spacing, implying a potentially candidate of Pt catalyst for applications in the encapsulated DSSCs as Pt-free CEs.
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Energy Storage Materials
·
2022
·
IF 20.831
Xuewen Hu,Qicheng Zhang,Ning Gong,Xifan Chen,Lan Wang,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
MXenes, a new family of two-dimensional materials, have been recognized as promising candidates for supercapacitors because of their unique chemical and physical properties. It has been proven that the terminal groups on MXenes play a decisive role in the pseudocapacitance . In this study, we report a highly efficient strategy to remove the –F terminal groups of Ti 3 C 2 T x . Our initial purpose was to explore the application of Ti 3 C 2 T x in sodium-ion batteries, whereas we found that almost all the –F terminal groups on Ti 3 C 2 T x could be eliminated by reaction with Na metal at high temperature, and abundant terminal –O was introduced after the subsequent washing step. The mechanism involved is clarified by combining systematical spectra analysis and density functional theory (DFT) calculations. In addition, the modulated Ti 3 C 2 T x MXene shows an extraordinarily high specific capacitance of 521 F·g −1 (at scan rate of 2 mV·s −1 ) or 578 F·g −1 (at a discharge rate of 1 A·g −1 ) in 1 м H 2 SO 4 , and 92% capacity could be retained even after 10000 cycles. This study should provide new insight into the surface chemistry of MXenes and facilitate its applications in a variety of fields.
研究领域:
材料科学
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电化学
·
能源存储
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengqian Li,Shengyuan Wang,Siwen Yang,Xiaoran He,Jiaxing Yang,Shuhao Zheng,Wen Luo,Haoran An
MXenes are considered ideal electrode materials. However, the cumbersome and poorly efficient preparation of few-layer MXenes, whereas the electrochemical performance of the more easily producible multi-layer MXenes is fundamentally constrained by severe interlayer stacking. In this work, the (002) facet orientation of multi-layer Ti 3 C 2 T x was modified via a solvothermal process, resulting in substantially enhanced electrochemical properties. The texture coefficients of (002) facet (TC (002) ) in multi-layer Ti 3 C 2 T x increases with increasing solvothermal temperature. Moreover, the specific capacitance was calculated to be approximately proportional to TC (002) , and HMX-180 reached a capacity of 310.2 F g −1 at a current density of 1 A g −1 . Density functional theory (DFT) calculations revealed that the (002) facets have the minimum adsorption energy for H + and a higher Fermi energy level, indicating that the (002) facets are more likely to be enriched with H + and exhibit higher electrical conductivity. These features promote the rapid transport of H + between the Ti 3 C 2 T x layers. Furthermore, multi-layer Ti 3 C 2 T x prepared via MILD method also undergoes (002) facet orientation and corresponding performance enhancement through this approach. This work provides a universal and scalable approach for fabricating high-performance MXene electrodes, which holds considerable promise for developing next-generation supercapacitors for practical applications in portable electronics and sustainable energy systems. This strategy also offers considerable potential for application in other energy storage systems, including metal-ion batteries, and catalytic devices.
研究领域:
材料科学
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储能技术
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电化学
·
纳米材料
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超级电容器
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Junyan Li,Wei Zhang,Xin Ge,Ming Lu,Xiangxin Xue,Zizhun Wang,Nailin Yue,Junkai Zhang,Xingyou Lang,Qing Jiang,Weitao Zheng
Inspired by a well-known architecture notion that load-bearing walls enable maintaining a highly-stable multiple-floored building, superior advantages are afforded via fabricating the NH 4 + ions pre-intercalated Mo 2 CT x MXene (Mo 2 CT x -N) in a mixed solution of NH 4 F and HCl via a simple one-step hydrothermal method. As a result of the synergistic effects of pillared structure, immobilizing -F groups and unlocking Mo-based redox, the Mo 2 CT x -N remarkably delivered a reversible capacity of 384.6 mAh g −1 at 200 mA g −1 after 100 cycles. Our work lays a foundation for fully packaging its optimal performance via carding and architecting the chemistry of the MXene layers and between them.
研究领域:
材料科学
·
电化学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Wenhai Wang,Shu Xiao,Zhijian Jia,Hongzhen Xie,Tianhua Li,Qiqin Wang,Ning Gan
Foodborne pathogens could result in serious health issues to public and thus some rapid analysis methods are urgent developed to monitor them. Herein, a dual-mode aptasensor based on electrochemical and colorimetric modes was constructed for the on-site detection of Vibrio parahaemolyticus ( V.P) in shrimps as a model. A novel nanoprobe ( [email protected] @MXenes) was developed to generate both electrochemical and colorimetric signals by modifying phenylboronic acid and ferrocene on Pt-MXenes nanocomposite . The nanoprobe exhibited both features of peroxidase mimic and specific recognition. Simultaneously, a V.P aptamer-functionalized electrode interface was fabricated to firstly specifically capture V.P, then conjugated with [email protected] @MXenes to form a sandwich complex. The complex could catalyze tetramethylbenzidine (TMB)-H 2 O 2 to produce a visible signal, and generate electrochemical signal simultaneously. Under the optimal condition, the aptasensor could determine as low as 5 CFU mL −1 V.P by electrochemical mode and 30 CFU mL −1 V.P by colorimetric mode. These superior performances may be attributed to that the synergistic catalysis and conductive effects deriving from Pt and MXenes on the nanoprobe can significantly amplify the signals to improve detection sensitivity. In particular, the dual detection system could mutually verify to achieve high accuracy. The aptasensor could also be expanded to rapid analysis of other food-borne pathogens through changing the aptamer on the electrode.
研究领域:
生物传感技术
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食品安全检测
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
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IF 6.6
Sadegh Ghorbanzadeh,Wei Zhang,Zeinab Sanaee,Somayeh Mohammadi
The synthesis of MXenes with high surface area and porosity remains challenging due to reliance on aggressive etchants and delamination step. This work reports a mild and straightforward strategy to synthesize Ti 3 C 2 and Ti 2 C MXenes using a nano-platelet MAX phase precursor prepared via anisotropic molten salt synthesis. This precursor’s unique architecture—featuring a 15× higher surface area and 5× greater pore volume than conventional MAX phases—enables efficient Al removal with dilute hydrofluoric acid (4% HF), eliminating the need for delamination agents or post-etching processing. These MXenes achieve a high specific surface area of 105m 2/g and pore volume of 0.11c m3/g, representing 5- and 3-fold improvements over conventional MXenes. Notably, this work demonstrates the first investigation of MAX phase photothermal properties and establishes a new synthesis paradigm that eliminates delamination requirements while achieving record photothermal conversion efficiency (71.4% for MXene, 63.1% for MAX). The pre-engineered nanoplatelet architecture inherently prevents restacking, enabling stable performance for over 200 days without intercalation agents—addressing a critical limitation in MXene shelf-life and practical applicability.
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ANALYTICA CHIMICA ACTA
·
2025
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IF 6
Yuting Zhang,Ze Zhang,Hehua Zhang,Xin Xu,Tong Shen,Xiaohui An,Hongzhi Pan,Dong Chang
Circulating tumor cells (CTCs), as a critical biomarker for early diagnosis and real-time monitoring of tumor progression, play a significant role in early cancer diagnosis, treatment monitoring, and prognosis evaluation. However, existing CTCs detection methods are limited by low purity, long processing time, high cost, and insufficient specificity, making them inadequate for clinical needs. This study developed an ultrasensitive and visually detectable CTCs sensing platform. The platform integrates nucleic acid aptamer-functionalized dopamine-coated magnetic nanoparticles as capture probes for the specific isolation and enrichment of CTCs, and MXenes@MnCoZDH@Au NPs as signal-amplifying nanoprobes with exceptional peroxidase-like activity. The colorimetric sensing mechanism relies on the linear increase in absorbance with CTCs concentration, enabling quantitative detection. Under optimized experimental conditions, the sensor demonstrated a broad detection range of 10 to 10 6 cells/mL and an ultra-low 2 cells/mL detection limit. Compared to traditional methods, this detection approach exhibited high specificity, sensitivity, and reproducibility, highlighting its potential for clinical translation. This innovative method provides a reliable and practical tool for liquid biopsy-based cancer diagnostics, offering significant advancements in precision medicine.
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PubMed
高影响因子
Science China-Materials
·
2022
·Vol. 65
·期 11
·3053-3061
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IF 8.64
Ma Yiyuan,An Yurong,Xu Zhuo,Cheng Laifei,Yuan Wenyu
The poor oxygen evolution reaction (OER) activity of two-dimensional (2D) transition metal carbides (MXenes) is a major obstacle to their application in highperformance water splitting and fuel cells due to the high energy barriers for the absorption of intermediates. Here, we demonstrate that the lattice oxygen of M n X n −1 O 2 MXenes can be activated by 0D graphene quantum dots (GQDs), thereby activating the OER via the lattice-oxygen oxidation mechanism (LOM) instead of the conventional adsorbate evolving mechanism. The pH-dependent OER activity of M n X n −1 O 2 @GQDs and 18 O isotope-labelling experiments with time-of-flight secondary-ion mass spectrometry (TOF-SIMS) provide the direct evidence of LOM. Interestingly, the activated lattice oxygen amount can be controlled by the GQDs. The as-prepared 0D/2D Ti 3 C 2 O 2 @GQDs heterostructure delivers a highly reduced overpotential of 390 mV (bare Ti 3 C 2 O 2 : 530 mV) at a benchmark current density of 10 mA cm −2 . Through optimizing the thickness and the additional conductive substrate, the overpotential at 10 mA cm −2 decreases to 250 mV, while the Tafel slope is reduced to 39 mV dec −1 ; these values indicate the as-prepared heterostructure is superior to the state-of-the-art MXene-based OER catalysts. This work provides a new strategy to enhance the OER activity of M n X n −1 O 2 and extends the application of LOM from perovskite to MXenes.
研究领域:
材料科学
·
能源化学
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Biochar
·
2023
·Vol. 5
·期 1
·1-16
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IF 12.7
Liu Fenglei,Wang Shanshan,Zhao Chaofeng,Hu Baowei
Herein, a biochar-based composite (Ti 3 C 2 T x @biochar-PDA/PEI) was constructed by decorating Ti 3 C 2 T x and polydopamine on coconut shell biochar via electrostatic self-assembly method. Different characterization techniques were applied to explore the structure, morphology and composition of the sorbents. It was found that the higher porosity and diverse functional groups were conducive for Ti 3 C 2 T x @biochar-PDA/PEI to capture radionuclides, and the water environmental conditions made a great contribution to the adsorption process. The process of removing U(VI)/Cs(I) well complied with the Langmuir isotherm and Pseudo-second-order equations, which indicated that the single layer chemical adsorption occurred on the solid liquid interface. Meanwhile, this produced composite exhibited superior removal performance under complex co-existing ion environment, and the maximum adsorption amounts of U(VI) and Cs(I) reached up to 239.7 and 40.3 mg g −1 . Impressively, this adsorbent still exhibited good adsorption performance after three cycles of regeneration. The spectral analysis and DFT calculation demonstrated that adsorption of U(VI) might be a chemical process, while the adsorption of Cs(I) should be ion exchange or electrostatic attraction. This study demonstrated the potential application of Ti 3 C 2 T x @biochar-PDA/PEI as an effective remediation strategy for radioactive wastewater cleanup. Graphical Abstract
研究领域:
环境科学
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材料科学
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CHEMICAL PHYSICS LETTERS
·
2022
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IF 2.719
Dongxin He,Xiaojiao Yang,Deshun Huang,Guozong Yue,Luming Yang,Pengxiang Zhao
A novel alkyne functionalized polyvinyl alcohol (alkyne-PVA) encapsulated palladium-MXenes aerogel was fabricated in two steps, and the structure was characterized by scanning electron microscope (SEM), transition electron microscope (TEM) and X-ray diffraction (XRD). The as-prepared aerogel is regarded as an efficient electrocatalyst toward hydrogen evolution reaction (HER) after pyrolysis. Indeed, it shows a very efficient catalytic activity with a low overpotential of 44 mV (at 10 mA cm −2 ) for HER.
研究领域:
材料科学
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电化学
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 31
·14031-14044
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IF 7.6
Zhang Chengyang,Xia Guoqiang,Du Xiaohan,Zhen Mengmeng
Lithium−sulfur batteries (LSBs) hold great promise for next-generation energy storage, yet their practical application is hindered by the polysulfide shuttle effect and sluggish redox kinetics, especially under lean-electrolyte conditions. While high-entropy MXenes (HE-MX) exhibit promising electrocatalytic potential for addressing these issues, their performance is compromised by nanosheet restacking and an unfavorable electronic structure. Herein, we propose a synergistic dual-defect engineering strategy to address these limitations. A three-dimensional (3D) network consisting of P-doped, anion-vacancy-rich TiVCrMoC 3 T x HE-MX integrated with carbon nanotubes (P-HE-MX@C) is constructed as a multifunctional separator coating for LSBs. Comprehensive experimental analyses and density functional theory calculations reveal that the co-introduction of P-dopants and anionic vacancies upshifts the d -band center of HE-MX, optimizing polysulfide adsorption, substantially reducing the energy barriers for Li 2 S nucleation/decomposition, and accelerating Li + diffusion. This multifunctional electrocatalytic enhancement markedly expedites overall sulfur redox kinetics. Consequently, the cell employing the P-HE-MX@C modified separator achieves a low-capacity decay rate of 0.048% per cycle over 900 cycles at 1.0 C. Even under a high sulfur loading (5.69 mg cm −2 ) and a lean electrolyte (4.53 μL mg −1 ), the cell still delivers a high areal capacity of 5.67 mAh cm −2 at 0.1 C after 100 cycles. Additionally, the pouch cell with high sulfur loading maintains an ultrahigh capacity of 1.92 Ah over 20 cycles. This work establishes a fundamental design principle for the synergistic electronic engineering of high-entropy electrocatalysts, facilitating the development of high-energy, long-lifespan energy storage systems.
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Carbon Energy
·
2023
·Vol. 5
·期 12
·e387
·
IF 20.5
Xuemei Yao,Jialong Duan,Yuanyuan Zhao,Junshuai Zhang,Qiyao Guo,Qiaoyu Zhang,Xiya Yang,Yanyan Duan,Peizhi Yang,Qunwei Tang
Bandgap-tunable mixed-halide perovskite materials have attracted considerable interest because of their indispensability as top counterparts in tandem solar cells. However, the soft and disordered lattice always suffers from severe phase segregation under illumination, which is particularly susceptible to residual lattice strain. Herein, we report a strain regulation strategy by using alkenamides terminated Ti 3 C 2 T x MXenes as an additive into perovskite precursor. Apart from the role of a template for grain growth to obtain high-quality films, the stretchable alkyl chain promotes lattice shrinkage or expansion to form an elastic grain boundary to eliminate the spatially distributed stain and shut down ion migration channels. As a result, the all-inorganic perovskite solar cells based on CsPbIBr 2 and CsPbI 2 Br halides achieve prolonged device stability under harsh conditions and the best power conversion efficiencies up to 11.06% and 14.30%, respectively.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
能源材料
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