INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhongxuan Lin,Zhenluo Yuan,Huanhuan Zhang,Shuyan Guan,Xiaojiao Wang,Shiqian Zhao,Guangxin Fan,Yanping Fan,Baozhong Liu
Lowering the dehydrogenation temperature and maintaining high dehydrogenation capacity are greatly hindering the practical application of α-AlH 3 for the hydrogen fuel cell industry. Herein, the layered accordion-like V 2 C MXene is synthesized and doped into α-AlH 3 by mild ball milling . The 1 wt.% V 2 C-catalyzed α-AlH 3 possesses excellent dehydrogenation performance with a low initial decomposition temperature of 70.5 °C and a high hydrogen release capacity of 8.1 wt.%. Furthermore, 7.8 wt.% of hydrogen could be quickly released from α-AlH 3 -1 wt.% V 2 C composite within 15 min at 120 °C, with a lower activation energy of 69.5 kJ/mol than that of as-received sample. The excellent dehydrogenation performance is attributed to the high activity of the zero valence V catalyst which is transformed from the multivalent V during ball milling and to promote dissociation and reorganization of hydrogen. This effective approach significantly enhances the dehydrogenation of α-AlH 3 , providing a hopeful approach for modifying metal hydrides .
研究领域:
材料科学
·
无机化学
·
能源化学
·
纳米材料
·
储氢材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Ling Zhang,Jiaying Bi,Zhikun Zhao,Yuxin Wang,Daobin Mu,Borong Wu
High energy density Lithium-Sulfur (Li-S) batteries have attracted significant attention, although their severe energy decay and rate capability loss still hinder their large-scale application. Two-dimensional (2D) MXene materials can immobilize polysulfides via strong chemisorption and physical hinderance. However, MXene nanosheets tend to restack in solution, losing their favorable electronic conductivity due to functional substituents on the surface. In this work, a three-dimensional (3D) MXene material is fabricated with MXene nanosheets and carbon-poly (diallyl dimethyl ammonium chloride) nanoparticles using self-assembly strategy. As the sulfur host, the 3D material not only prevents MXene nanosheets from restacking, but also ensures to provide a framework to confine S and raises the utilization of sulfur. As a result, the sulfur cathode demonstrates a highly reversible specific capacity of 1016.8 mAh g −1 at 0.2 C, excellent rate capability, and long-term cycling stability, with the capacity decay rate of only 0.075% per cycle over 600 cycles at 1 C.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Zhiyuan Zhang,Ning Zhang,Jintao Li,Lei Chen,Xing Cao
Although the phase change material (PCM) is increasingly recognized for its potential in battery thermal management application, the effectiveness of PCM is hindered by issues such as high rigidity, prone leakage and low thermal conductivity. To get rid of such predicament, a novel flexible composite PCM containing the myristyl alcohol/olefin block copolymer/MXene is fabricated and tested in this paper, and then the applicability of this composite PCM on battery thermal management is evaluated through numerical simulation. The results indicate that the MXene enhances the thermal conductivity of the composite PCM, and up to 207 % increment is acquired by 15 wt% MXene. The excellent thermally-induced flexibility of the composite PCM is realized owing to the olefin block copolymer. Under the cooperative action of the MXene and the olefin block copolymer, the composite PCM features outstanding thermal reliability. As for the battery cooling application, the composite PCM features superior characteristic than the air. Considering the better thermal control performance, the low MXene addition in the composite PCM is appropriate for the high discharge rate, while the high MXene addition is suitable for the low discharge rate. The PCM thickness between parallel batteries exerts greater impact on battery thermal management in contrast to the PCM thickness between series batteries. The prepared composite PCM can meet the thermal control requirements when the ambient temperature is 20–35 °C.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Amr Osman,Hui Liu,Jian Lu
Wearable sensors are becoming a vital element of newly developed smart devices for their significant prospects in health monitoring, motion detection, and human–machine interactions. Introducing a cost-effective strategy to fabricate pressure sensors with high sensitivity, compressibility, recoverability, and linearity, while also maintaining control over the structure, is a challenge in the development of scalable and high-performance wearable devices. Herein, a fused deposition modelling (FDM)-assisted dip coating is performed to fabricate highly porous pressure sensors with gyroid topologies derived from 3D-printed sacrificial molds. A layer-by-layer dip coating is proposed to obtain a uniform conductive layer over elastomer-based scaffolds using negatively and positively charged MXene nanosheets. The porous sensor based on the self-assembled MXene demonstrates a high sensitivity (9.859 kPa −1 ) in an extensive linearity range of up to 50 kPa, negligible hysteresis, and good stability up to 1750 cycles. Additionally, the sensor exhibits high temperature sensitivity (4.349 % °C −1 ) with superb linearity (up to 100 °C). The distinctive sensing and deformation mechanisms are elucidated in detail using in situ SEM and finite element analysis. By tuning the lattice structure of the sensors, the pressure sensitivities can be significantly improved to 34.43 kPa −1 and 84.47 kPa −1 within the pressure ranges of 12–34 kPa and 34–55 kPa, respectively. The gyroid-derived pressure sensor exhibits promising potential in diverse applications, including pulse rate monitoring, phonation, and motion activities. A 4 × 4 sensor array is assembled to provide real-time spatial pressure mapping. Furthermore, the wearability of the sensor can be tailored to introduce user-specific products.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xue Zhu,Xin Qian,Mengyuan Hao,Yonggang Zhang,Zhenjiang Zhang,Shujun Li,Haonan Wu
Two-dimensional transition-metal carbides (MXene) has been considered as a promising choice for outstanding EMW absorption material, because of the single dielectric loss caused by its high dielectric constant and the various polarization modes attributed to the abundant surface groups. However, the impedance mismatch caused by high dielectric constant and the structural design difficulties resulted from lamellar self-stacking limit the application of MXene. In this study, large-size MXene precipitation and small-size MXene were separated by a differential centrifugal method. A novel flower-like MXene (MXene-F) self-assembled from small-size MXene was obtained by an ice template method. The chemical compositions of MXene and its formation mechanism were analyzed by XRD, XPS, Raman and FTIR. Results showed that nano-scaled MXene could self-assemble into a spherical structure under the action of intermolecular hydrogen bonds. The porous structure of MXene-F was conducive to its impedance matching, and its flower-like structure could enhance the multiple reflection and scattering. Therefore, MXene-F possessed excellent absorption performance with a minimum reflection loss of −66.9 dB at a thickness of only 1.47 mm and an effective absorption bandwidth of 4.08 GHz. This work provides a novel and effective approach for the preparation of MXene EMW absorbing materials with low thickness and high reflection loss.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 17
·25273-25286
·
IF 0
Chen Junxia,Yang Zhenzhen,Li Weigang,Yang Yuying,Zhu Feng,Huo Zongli,Zhou Qing
The poor conductivity, poor stability, and agglomeration of iron-based metal organic framework MIL-88A(Fe) limit its application as persulfate (PS) activator in water purification. Herein, MXene-supported MIL-88A(Fe) composites (M88A/MX) were synthesized to enhance its adsorption and catalytic capability for tetracycline (TC) removal. Scanning electron microscope (SEM), X-ray diffractometer (XRD), Fourier transform infrared spectrometer (FT-IR), and X-ray photoelectron spectroscopy (XPS) were used to characterize prepared materials, confirming the successful attachment of MIL-88A(Fe) to the surface of MXene. M88A/MX-0.2 composites, prepared with 0.2 g MXene addition, exhibit optimal degradation efficiency, reaching 98% under conditions of 0.2 g/L M88A/MX-0.2, 1.0 mM PS, 20 ppm TC, and pH 5. The degradation rate constants of M88A/MX-0.2 were 0.03217 min −1 , which was much higher than that of MIL-88A(Fe) (0.00159 min −1 ) and MXene (0.00626 min −1 ). The removal effects of reaction parameters, such as dosage of M88A/MX-0.2 and PS; initial solution pH; and the presence of the common co-existing constituents (humic acid and the inorganic anions) were investigated in detail. Additionally, the reuse of M88A/MX-0.2 showed that the composites had good cycling stability by recurrent experiments. The results of electron paramagnetic resonance (EPR) and quenching experiments indicated that ·OH, ·SO 4 − , and ·O 2 − were involved in the M88A/MX-0.2/PS system where persulfate oxidation process was activated with prepared M88A/MX-0.2. In addition, the intermediates of photocatalytic degradation were determined by HPLC–MS, and the possible degradation pathways of the target molecules were inferred. This study offered a new avenue for sulfate-based degradation of Fe-based metal organic framework.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chao Ji,Ying Wang,Zhenqiang Ye,Liyuan Tan,Dasha Mao,Wenguang Zhao,Xiaoliang Zeng,Changzeng Yan,Rong Sun,Dae Joon Kang,Jianbin Xu,Ching-Ping Wong
High-performance thermal management materials are essential in miniaturized, highly integrated, and high-power modern electronics for heat dissipation. In this context, the large interface thermal resistance (ITR) that occurs between fillers and the organic matrix in polymer-based nanocomposites greatly limits their thermal conductive performance. Herein, through-plane direction aligned three-dimensional (3D) MXene/silver (Ag) aerogels are designed as heat transferring skeletons for epoxy nanocomposites. Ag nanoparticles (NPs) were in situ decorated on exfoliated MXene nanosheets to ensure good contact, and subsequent welding of ice-templated MXene/Ag nanofillers at low temperature of ∼200 °C reduced contact resistance between individual MXene sheets. Monte Carlo simulations suggest that thermal interficial resistance (R0) of the MXene/Ag–epoxy nanocomposite was 4.5 × 10–7 m2 W–1 K–1, which was less than that of the MXene–epoxy nanocomposite (Rc = 5.2 × 10–7 m2 W–1 K–1). Furthermore, a large-scale atomic/molecular massively parallel simulator was employed to calculate the interfacial resistance. It was found that RMXene = 2.4 × 10–9 m2 K W–1, and RMXene-Ag = 2.0 ×10–9 m2 K W–1, respectively, indicating that the Ag NP enhanced the interfacial heat transport. At a relatively low loading of 15.1 vol %, through-plane thermal conductivity reached a value as high as 2.65 W m–1 K–1, which is 1225 % higher than that of pure epoxy resin. Furthermore, MXene/Ag–epoxy nanocomposite film exhibits an impressive thermal conductive property when applied on a Millet 8 and Dell computer for heat dissipation.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Yanli Sun,Bo Li,Huafu Zheng,Kai Rong,Wei Fan,Danyang Li
Lightweight, good processability and efficient electromagnetic interference (EMI) shielding materials have captured more interest with the recognition of electromagnetic pollution hazards. Biomass-based carbon has been considered as a promising EMI shielding due to its low cost, renewability and environmental friendliness. Here, we used jute felt as the precursor of biomass carbon to fabricate the MXene (Ti 3 C 2 T x )/jute composite (MXene/CJ) via a simple carbonization process and dip-and-dry method. Higher carbonization temperature and more MXene loading are conducive to electrical conductivity and shielding effectiveness (SE). When the carbonization temperature was 900 °C and dip-and-dry times was 3, the average EMI SE of 59.08 dB was achieved in 8.2–12.4 GHz (X-band) with a reflection-dominated mechanism. Besides, the composite also exhibits the potential to be used as a strain sensor. Under small pressure, the composite possessed excellent sensitivity and response time. The wrist bending, swallowing and vocal cord vibration can be monitored in real-time. These results illustrate that the MXene/CJ composite has a broad prospect in the EMI shielding and wearable electronics fields. This work also provided a feasible approach for the high-value utilization of natural biomass resources.
研究领域:
材料科学
·
环境科学
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Wenbin Ren,Jinfeng Luan,Liang Yin,Huijuan Chen,Changchun Wang,Pinhua Zhang,Guangliang Cui,Li Lv
The development of real-time trace-level NO2 quantification platforms that can be operated at room temperature constitutes a critical advancement for occupational safety and public health monitoring systems. This study demonstrates a room-temperature NO2 sensor using MXene–Cu2O composites prepared via a hydrothermal method. Systematic evaluation of MXene-introduced effects identified the 0.84 wt % MXene–Cu2O composite as optimal, exhibiting 4-fold enhanced sensitivity and shorter response (55 s)/recovery (35 s) time compared to pure Cu2O. Additionally, the sensor exhibits a low detection limit (10 ppb), high selectivity, great reversibility, and long-term stability. The enhanced sensing performance originates from precisely engineered interfacial architectures between MXene and Cu2O, which effectively adjust the charge-transfer behavior through the conduction tunnel in the sensing material. Furthermore, oxygen vacancy engineering creates defect-mediated adsorption centers that promote selective NO2 chemisorption through charge polarization effects. This research offers a novel strategy for designing optimized structures to enhance the sensitivity of MOS-based materials for NO2 gas detection.
研究领域:
材料科学
·
环境监测
·
化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yilei Gao,Biaobiao Yan,Man Zhou,Yuanyuan Yu,Qiang Wang,Ping Wang
Functional textiles decorated with two-dimensional transition metal carbon/nitride (MXene) have been widely studied in many fields due to their favorable conductivity and easy scalability. However, the susceptibility to oxidation and poor bonding fastness limit their wide applications in the field of wearable textiles. Herein, cationization modification of cotton textile was performed by using a branched compound of polyethylenimine (PEI), followed by efficient electrostatic assembly of MXene nanosheets onto the modified fiber surfaces, aiming at fabricating durable wearable textiles with multiprotection functions. Under the assistance of PEI molecules, MXene was uniformly deposited on the surface of cationic cotton fabric to form a stable and orderly nanosheet coating, realizing the efficient utilization of electroactive media. The assembled textile exhibits good conductivity (130.6 S/m), high solar spectral absorptivity (89%), and low mid-infrared emissivity (0.245), which allows for a flexible conversion system of Joule heating, solar heating, and low radiation heating to meet personal warming needs. In addition, the MXene-assembled textile offers excellent electromagnetic interface shielding (28 dB) and infrared thermal camouflage while retaining good breathability and moisture permeability. This simple strategy, based on the PEI-mediated assembly of MXene, provides an alternative for facilitating smart textiles with multiprotective function.
研究领域:
材料科学
·
纺织工程
·
智能穿戴技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Lu Tang,Huajing Wang,Zhenming Du,Chaoqi Zhu,Chaofan Ma,Dawen Zeng
Due to the large band gap, most metal oxide semiconductor (MOS)-based gas sensors operate at high temperatures, which greatly limits their performance for gas sensing. In this work, we reported the successful synthesis of nanocomposites consisting of porous MXene nanosheets formed by the sublimation of sulfur and SnO2 nanoparticles (S-PM/SnO2). To prevent the restacking of MXene flakes under van der Waals force, a sacrificial S-template method was employed to transform MXene into a three-dimensional (3D) structure. The presence of MXene lowers the operating temperature. With a high response (∼30.6 – 10 ppm of H2S), rapid response speed (∼16.6 s – 50 ppm of H2S), high sensitivity (∼3.12 ppm–1), low detection limits (distinct response to 100 ppb H2S), and good selectivity at 100 °C, the sensor based on the optimal sample of S-PM/SnO2-6 demonstrates excellent H2S sensing performance. The improvement in H2S gas-sensing capacity can be attributed to the development of heterojunctions at the interface of porous MXene nanosheets (S-PM) and SnO2 nanoparticles (NPs). This leads to an enlarged surface depletion region and an elevated potential barrier, which significantly amplifies the range of resistance variation. These results suggest that S-PM/SnO2 nanocomposite has promising prospects in the realm of low-temperature and highly sensitive H2S detection.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Materialia
·
2018
·
IF 0
Zhengyang Shen,Zeyi Wang,Min Zhang,Mingxia Gao,Jianjiang Hu,Fang Du,Yongfeng Liu,Hongge Pan
A novel solid-solution MXene (Ti 0.5 V 0.5 ) 3 C 2 is successfully synthesized by exfoliating a solid-solution MAX phase (Ti 0.5 V 0.5 ) 3 AlC 2 , and its catalytic effect on the hydrogen storage reaction of Mg is systemically evaluated for the first time. Typical layer morphology is observed for the prepared (Ti 0.5 V 0.5 ) 3 C 2 , which exhibits a better catalytic activity than that of Ti 3 C 2 . The addition of 10 wt% (Ti 0.5 V 0.5 ) 3 C 2 remarkably reduces the dehydrogenation onset temperature of MgH 2 by 70 °C, from 266 to 196 °C. At 250 °C, approximately 5.0 wt% H 2 is released from the 10 wt% (Ti 0.5 V 0.5 ) 3 C 2 -containing MgH 2 within 20 min. The dehydrogenated sample rapidly absorbs 4.8 wt% H 2 within 5 s at 120 °C; these hydrogenation kinetics are much more superior even to the well-studied Nb 2 O 5 catalyst. The apparent activation energy is calculated to be 77.3 kJ/mol for the MgH 2 -10 wt% (Ti 0.5 V 0.5 ) 3 C 2 sample, which is only around half of that of the pristine MgH 2 (153.8 kJ/mol). This is responsible for the remarkably reduced dehydrogenation operating temperature. Moreover, the chemical states of (Ti 0.5 V 0.5 ) 3 C 2 during dehydrogenation are also analysed and discussed.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
危险品化学品经营许可证（带存储）