TALANTA
·
2025
·
IF 6.1
Zhihua Zhao,Shixin Ma,Zijie Su,Huiqin Li,Qilin Zou
The development of triboelectric nanogenerator (TENG)-powered gas sensors capable of actively harvesting environmental energy has become critically important in today's energy-conscious world. This study presents a triethylamine (TEA) gas sensor based on a PVA/MXene/CoFe 2 O 4 nanocomposite hydrogel TENG, utilizing heterointerface-rich MXene/CoFe 2 O 4 nanomaterials combined with polyvinyl alcohol (PVA) polymer matrix. Systematic characterization via XRD, XPS, SEM, and TEM elucidated the composite's elemental composition and microstructure. The PTMC-7 TENG-powered sensor demonstrated exceptional electrical output, generating 170 V open-circuit voltage under 7 N contact force at 1 Hz frequency - sufficient to power 30 LEDs through rectifier-integrated circuits. Its silicone encapsulation enabled finger-joint mounted micro-motion detection. The sensor exhibited 105.11 % response to 100 ppm TEA at room temperature with fast response/recovery (31 s/23 s) and outstanding stability (<3.2 % degradation over 30 days). By converting TENG output modulation into gas concentration readings, this design achieves battery-free TEA detection while synergistically integrating energy harvesting and sensing functionalities, establishing a novel paradigm for flexible sensor development.
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高影响因子
ACS Sensors
·
2019
·
IF 6.944
Hanhan Xie,Penghui Li,Jundong Shao,Hao Huang,Yue Chen,Zhenyou Jiang,Paul K. Chu,Xue-Feng Yu
A reliable surface-enhanced Raman scattering (SERS) substrate composed of two-dimensional (2D) MXene (Ti3C2Tx) nanosheets and gold nanorods (AuNRs) is designed and fabricated for sensitive detection of organic pollutants. The AuNRs are uniformly distributed on the surface of the 2D MXene nanosheets because of the strong electrostatic interactions, forming abundant SERS hot spots. The MXene/AuNR SERS substrate exhibits high sensitivity and excellent reproducibility in the determination of common organic dyes such as rhodamine 6G, crystal violet, and malachite green. The detection limits are 1 × 10–12, 1 × 10–12, and 1 × 10–10 M, and relative standard deviations determined from 13 areas on each sample are 18.1, 10.1, and 15.6%, respectively. In the determination of more complex organic pesticides and pollutants, the substrate also shows excellent sensitivity and quantitative detection, and the detection limits for thiram and diquat of 1 × 10–10 and 1 × 10–8 M, respectively, are much lower than the contaminant levels stipulated by the US Environmental Protection Agency. The MXene/AuNR composite constitutes an efficient SERS platform for reliable and high-sensitivity environmental analysis and food safety monitoring.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xingchen Fu,Hui Chang,Zhichao Shang,Pingle Liu,Jikai Liu,He'an Luo
Cuprous oxide (Cu 2 O) has been envisioned as a promising photocathode material for photoelectrochemical (PEC) water reduction due to its abundance, scalability and nontoxicity. Herein, a three-dimensional (3D) Cu 2 O nanorods (NRs) photocathode is prepared by in-situ growing Cu 2 O NRs on a copper foam substrate. The bare 3D Cu 2 O NRs photocathode exhibits a high photocurrent density of −4.02 mA cm −2 at 0 V versus the reversible hydrogen electrode (RHE) under AM 1.5 G simulated sunlight. The oxygen vacancies enriched Ti 3 C 2 T X flakes are obtained by reducing Ti 3 C 2 T X with H 2 /Ar gas (denoted as H:Ti 3 C 2 T X ). The H:Ti 3 C 2 T X /Cu 2 O, Ti 3 C 2 T X /Cu 2 O as well as Au/Cu 2 O composite photocathodes are fabricated through a facile dip-coating method. The H:Ti 3 C 2 T X /Cu 2 O and Ti 3 C 2 T X /Cu 2 O yield a photocurrent density of −5.41 and −4.45 mA cm −2 respectively, which is higher than the bare Cu 2 O and Au/Cu 2 O (−4.31 mA cm −2 ). The results suggest that the Ti 3 C 2 T X is more effective than noble metal Au for improving the PEC performance of Cu 2 O photocathode. The superior performance of H:Ti 3 C 2 T X /Cu 2 O is attributed to enriched oxygen vacancies in the H:Ti 3 C 2 T X which can enhance the conductivity, light-harvesting efficiency and charge-transfer ability of fabricated photocathode. A PEC tandem cell with H:Ti 3 C 2 T X /Cu 2 O as the photocathode and BiVO 4 as the photoanode is designed for unassisted solar water splitting. Due to the high porosity and optical transmittance of the 3D copper foam substrate, we illuminate the cell from the H:Ti 3 C 2 T X /Cu 2 O side rather than from the BiVO 4 side in usual fashion. The present configuration exhibits a 1.6 times higher solar-to-hydrogen (STH) conversion efficiency of 0.55% than the conventional design with a STH conversion efficiency of 0.34%. The enhanced STH conversion efficiency in our configuration is due to the higher light-harvesting efficiency.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Junlin Chen,Xiang Chen,Zhifeng Hao,Zhuorui Wu,Mohamed S. Selim,Jian Yu,Yingming Huang
To solve the problem of ice condensation and adhesion, it is urgent to develop new anti-icing and deicing technologies. This study presented the development of a highly efficient photothermal-enhanced superhydrophobic PDMS/Ni@Ti3C2Tx composite film (m-NMPA) fabricated cost-effectively and straightforwardly. This film was fabricated utilizing PDMS as a hydrophobic agent, adhesive, and surface protector, while Ni@Ti3C2Tx as a magnetic photothermal filler innovatively. Through a simple spraying method, the filler is guided by a strong magnetic field to self-assemble into an eyelash-like microstructure array. The unique structure not only imparts superhydrophobic properties to the surface but also constructs an efficient “light-capturing” architecture. Remarkably, the m-NMPA film demonstrates outstanding superhydrophobic passive anti-icing and efficient photothermal active deicing performance without the use of fluorinated chemicals. The micro-/nanostructure of the film forms a gas layer, significantly delaying the freezing time of water. Particularly under extreme cold conditions (−30 °C), the freezing time is extended by a factor of 7.3 compared to the bare substrate. Furthermore, under sunlight exposure, surface droplets do not freeze. The excellent photothermal performance is attributed to the firm anchoring of nickel particles on the MXene surface, facilitating effective “point-to-face” photothermal synergy. The eyelash-like microarray structure enhances light-capturing capability, resulting in a high light absorption rate of 98%. Furthermore, the microstructure aids in maintaining heat at the uppermost layer of the surface, maximizing the utilization of thermal energy for ice melting and frost thawing. Under solar irradiation, the m-NMPA film can rapidly melt approximately a 4 mm thick ice layer within 558 s and expel the melted water promptly, reducing the risk of secondary icing. Additionally, the ice adhesion force on the surface of the m-NMPA film is remarkably low, with an adhesion strength of approximately 4.7 kPa for a 1 × 1 cm2 ice column. After undergoing rigorous durability tests, including xenon lamp weathering test, pressure resistance test, repeated adhesive tape testing, xenon lamp irradiation, water drop impact testing, and repeated brushing with hydrochloric acid and particles, the film’s surface structure and superhydrophobic performance have remained exceptional. The photothermal superhydrophobic passive anti-icing and active deicing technology in this work rely on sustainable solar energy for efficient heat generation. It presents broad prospects for practical applications with advantages such as simple processing method, environmental friendliness, outstanding anti-icing effects, and exceptional durability.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 35
·2103210
·
IF 18.808
Xue Wang,Yuanming Wang,Yunpeng Jiang,Xiaolong Li,Yang Liu,Huanhao Xiao,Yu Ma,You-yuan Huang,Guohui Yuan
Exploiting Zn metal-free anode materials would be an effective strategy to resolve the problems of Zn metal dendrites that severely hinder the development of Zn ion batteries (ZIBs). However, the study of Zn metal-free anode materials is still in their infancy, and more importantly, the low energy density severely limits their practical implementations. Herein, a novel (NH 4 ) 2 V 10 O 25 · 8H 2 O@Ti 3 C 2 T x (NHVO@Ti 3 C 2 T x ) film anode is proposed and investigated for constructing “rocking-chair” ZIBs. The NHVO@Ti 3 C 2 T x electrode shows a capacity of 514.7 mAh g −1 and presents low potential which is 0.59 V (vs Zn 2+ /Zn) at 0.1 A g −1 . The introduction of Ti 3 C 2 T x not only affords an interconnected conductive network, but also stabilizes the NHVO nanobelts structure for a long cycle life (84.2% retention at 5.0 A g −1 over 6000 cycles). As a proof-of-concept, a zinc metal-free full battery is successfully demonstrated, which delivers the highest capacity of 131.7 mAh g −1 (mass containing anodic and cathodic) and energy density of 97.1 Wh kg −1 compared to all reported aqueous “rocking-chair” ZIBs. Furthermore, a long cycling span of 6000 cycles is obtained with capacity retention reaching up to 92.1%, which is impressive. This work is expected to provide new moment toward V-based materials for “rocking-chair” ZIBs.
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高影响因子
FUEL
·
2024
·
IF 6.7
Junqian Wang,Yi Wang,Yuqi Wang,Xinyi Li,Caichao Wu,Tianyu Zhang,Bin Tian,Lili Qian,Yang Guo,Le Wu,Lan Zheng,Yanan Li,Xin Ding
Currently, traditional hydrodeoxygenation (HDO) catalysts have various shortcomings such as low activity levels and vulnerability to deactivation. Therefore, a series of MXene-supported Ni-M (M = Pd, Pt, Ru) bimetallic catalysts were designed and prepared. The above catalysts were also comprehensively characterized using XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, SEM and TEM methods. Moreover, due to the largest particular specific surface area, moderate amount of acid sites and the strongest three-electron transfer channels between support and active metals of Ni-Pd/MXene catalyst, it exhibited the superior catalytic performance to achieve 100 % guaiacol conversion and 35.15 % highest overall yields of HDO products (Y HDO ) under the optimal reaction conditions (at 340 °C for 8 h, utilizing in-situ hydrogen source: formic acid). Furthermore, a detailed discussion on the main reaction pathways and mechanism of guaiacol HDO catalyzed by Ni-Pd/MXene was provided, an unique bimetallic synergistic “relay catalytic” theory has been proposed. Kinetic studies revealed that phenol, one of the main HDO products, is primarily generated via guaiacol demethoxylation, while catechol dehydroxylation to phenol acts as the rate-determining step. This work introduces a new strategy for the development of HDO catalysts.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Dongqi Liu,Yanchen Wang,Weihao Lu,Lei Xiao,Jun Di,Fengqi Zhao,Xiaojun Feng,Kun Zhang,Wei Jiang,Gazi Hao
Multifunctional composite catalysts show significant potential for enhancing the thermal decomposition and combustion of energetic materials. However, their synergistic mechanisms remain unclear. In this work, we prepared a 3D macroporous (3DM) CuO/ZnO catalyst via PMMA template calcination and combined it with Ti 3 C 2 T x MXene through electrostatic assembly, to form a 3DM CuO/ZnO-Ti 3 C 2 T x heterogeneous catalyst with uniform morphology and high conductivity. Results show that 3DM CuO/ZnO-Ti 3 C 2 T x has a good catalytic effect on TKX-50, which can advance the decomposition peak from 246 to 208 ℃, increase the heat release from 730 to 1106 J/g and boost combustion time from 560 to 790 ms, improve the flame temperature from 773 to 1109 ℃. By combining LAMMPS, materials studio software and TG-MS-IR analysis, the catalytic mechanism of 3DM material on the thermal decomposition of TKX-50 was deeply explored. 3DM materials can adsorb hydroxylamine molecule, accelerate the H + transfer process, achieve rapid exchange of H and OH, and realize the rapid and concentrated release of gas, thereby promoting the decomposition process of TKX-50. Consequently, the construction of composite catalysts with synergy can start from the perspective of forming more heterostructures, which provides better theoretical support for future research on composite catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Qingying Feng,Yingqing Zhan,Wei Yang,Ao Sun,Hongyu Dong,Yu-Hsuan Chiao,Yucheng Liu,Ximin Chen,Yiwen Chen
Developing the multi-functional membranes including oil/water emulsion separation and removal of hazardous organic pollutants is essential to the purification of the complicated wastewater. However, it remains a daunting challenge to combine these intended functions while maintaining high separation efficiency. Herein, we developed a new 2D lamellar MXene/poly (arylene ether nitrile) (PEN) fibrous composite membrane through the self-assembly of TiO 2 nanoparticles intercalated MXene nanosheets onto the porous PEN nanofibrous mats and bioinspired polydopamine triggered chemical-crosslinking with polyethyleneimine (PEI). Such nano-intercalation and mussel-inspired crosslinking could effectively regulate the interlayer spacing of the MXene nanosheet skin layer and surface wettability of the composite membrane, which also further contributed to the fast separation and unique bifunctional feature. It was found that the MXene@TiO 2 /PEN fibrous composite membrane exhibited low oil-adhesion and superhydrophilic (WCA = 0°)/underwater superoleophobic (UOCA > 155°) properties, which could efficiently separate various surfactant-stabilized oil-in-water emulsions under low pressure of 0.04 MPa while keeping good stability (Under 1 M HCl and 2 M NaOH solutions) and recyclability. Interestingly, the fibrous composite membrane achieved favorable permeation flux of 908–1003 Lm −2 h −1 (2270–2507.5 Lm −2 h −1 bar −1 ) in comparison to other reported MXene based multifunctional composite membranes. Moreover, owing to the synergistic effect of MXene nanosheets and TiO 2 nanoparticles, the MXene@TiO 2 /PEN membrane showed excellent photocatalytic degradation performance for various dyes under visible light, i.e. the photocatalytic degradation efficiency for 15 ppm MB, MO, CV, and MeB solutions achieved 92.31%, 93.50%, 98.06%, and 99.30% within 60 min, respectively. Such 2D MXene bio-functional composite membranes with outstanding oil/water emulsions separation and photocatalytic degradation of dyes pave an avenue for treating complicated oily wastewater.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-10
·
IF 5.3
Qu Xiangwen,Zhou Pengwei,Shi Boya,Zheng Yekai,Kan Lian,Jiang Li
A multifunctional surface-enhanced Raman scattering (SERS) platform integrating sensitive detection and drug resistance analysis was developed for Gram-positive bacteria. The substrate was based on self-assembled Ti 3 C 2 T x @Au NPs films and capture molecule phytic acid (IP6) to achieve specific capture of Gram-positive bacteria and different bacteria were analyzed by fingerprint signal. It had advantages of good stability and homogeneity (RSD = 8.88%). The detection limit (LOD) was 10 2 CFU/mL for Staphylococcus aureus and 10 3 CFU/mL for MRSA, respectively. A sandwich structure was formed on the capture substrate by signal labels prepared by antibiotics (penicillin G and vancomycin) and non-interference SERS probe molecules (4-mercaptobenzonitrile (2223 cm −1 ) and 2-amino-4-cyanopyridine (2240 cm −1 )) to improve sensitivity. The LOD of Au NPs@4-MBN@PG to S. aureus and Au NPs@AMCP@Van to MRSA and S. aureus were all improved to 10 CFU/mL, with a wide dynamic linear range from 10 8 to 10 CFU/mL ( R 2 ≥ 0.992). The SERS platform can analyze the drug resistance of drug-resistant bacteria. Au NPs@4-MBN@PG was added to the substrate and captured MRSA to compare the SERS spectra of 4-MBN. The intensity inhomogeneity of 4-MBN at the same concentrations of MRSA and the nonlinearity at the different concentrations of MRSA revealed that MRSA was resistant to PG. Finally, the SERS platform achieved the determination of MRSA in blood. Therefore, this SERS platform has great significance for the determination and analysis of Gram-positive bacteria. Graphical Abstract
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