APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Xin Guo,Hao Zhang,Yiyuan Yao,Chengming Xiao,Xin Yan,Ke Chen,Junwen Qi,Yujun Zhou,Zhigao Zhu,Xiuyun Sun,Jiansheng Li
Integrating the merits of the substrate and active sites with the water matrix is of significant importance to design novel catalysts for peroxymonosulfate (PMS)-based advanced oxidation processes. A sandwich-like heterostructure catalyst (MCoO@Co-N-C) were fabricated via anchoring zero-dimensional metal-organic frameworks (MOFs)-derived CoO nanoparticles on two-dimensional Ti 3 C 2 T x MXene nanosheets . Benefiting from the distinctive structure, the resultant catalysts achieved excellent decontamination performance under high salinity conditions (200 mM). Nearly 100% efficiency of bisphenol A (BPA) was degraded within 10 min only using 0.05 g L −1 catalyst and 0.1 g L −1 PMS, with exceptional high turnover frequency (TOF) value (8.64 min −1 ) which was 22.5 times higher than that of MOFs derived catalysts without MXene. A mediated-electron transfer mechanism is found to be conducive to the oxidation of BPA. This work provides a new approach to novel catalysts designed for removing trace organic contaminants (TrOCs) in saline water.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 13
·2249
·
IF 5.719
Rui Cai,Jinlong Zhao,Naixin Lv,Anqing Fu,Chengxian Yin,Chengjun Song,Min Chao
Herein, the curing kinetics and the glass transition temperature (Tg) of MXene/phenolic epoxy composites with two curing agents, i.e., 4,4-diaminodiphenyl sulfone (DDS) and dicyandiamine (DICY), are systematically investigated using experimental characterization, mathematical modeling and molecular dynamics simulations. The effect of MXene content on an epoxy resin/amine curing agent system is also studied. These results reveal that the MXene/epoxy composites with both curing agent systems conform to the SB(m,n) two-parameter autocatalytic model. The addition of MXene accelerated the curing of the epoxy composite and increased theTgby about 20 K. In addition, molecular dynamics were used to simulate theTgof the cross-linked MXene/epoxy composites and to analyze microstructural features such as the free volume fraction (FFV). The simulation results show that the introduction of MXene improves theTgandFFVof the simulated system. This is because the introduction of MXene restricts the movement of the epoxy/curing agent system. The conclusions are in good agreement with the experimental results.Keywords:MXene;epoxy resin;amine curing agent;curing kinetics;molecular dynamic simulations;non-isothermal DSC
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高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Wenbin Yu,Shaobo Ma,Mengxue He,Ruinan Li,Hui Yang,Yong Li,Geping Yin,Pengjian Zuo
Inhibiting the shuttle effect and accelerating the reaction kinetics of soluble lithium polysulfides (LiPS) are crucial for constructing high-performance lithium–sulfur (Li–S) batteries. Herein, a novel iodine-doped MXene (I-MXene)-modified separator is proposed to optimize the electrochemical performance of Li–S batteries. The I-MXene composite exhibits a uniform two-dimensional layer structure and high electronic conductivity, which are beneficial for building high conductivity and a thin/uniform coating layer. Additionally, the I-MXene can effectively immobilize LiPS through Ti–S bonds and accelerate the reaction kinetics of LiPS conversion. When combined with the KB/S cathode, the cell using the I-MXene-modified separator displays a high initial discharge capacity of 1308 and 761 mAh g–1 after 100 cycles at 0.2 C, as well as high C-rate capability (655 mAh g–1/2 C). With a sulfur area loading above 5 mg cm–2, the cell matching the I-MXene/PP separator still delivers an attractive reversible capacity of 578 mAh g–1 after 200 cycles at 0.2 C. The novel catalytic two-dimensional materials and separator modification method proposed here are expected to facilitate the practical application of Li–S batteries.
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高影响因子
Nanoscale
·
2022
·Vol. 14
·期 40
·14902-14912
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IF 8.307
Kun Liu,Haishun Du,Wei Liu,Meng Zhang,Yaxuan Wang,Huayu Liu,Xinyu Zhang,Ting Xu,Chuanling Si
Flexible and light weight electromagnetic interference (EMI) shielding materials with high electromagnetic shielding efficiency (SE) and excellent mechanical strength are highly demanded for wearable and portable electronics. In this work, for the first time, a freestanding and flexible cellulose nanofibril (CNF)/PEDOT:PSS/MXene (Ti3C2Tx) nanocomposite film with a ternary heterostructure was manufactured using a vacuum-assisted filtration process. The results show that compared with pure MXene films, the tensile strength of the optimized nanocomposite film increases from 8.88 MPa to 59.99 MPa, and the corresponding fracture strain increases from 0.87% to 4.60%. Intriguingly, the optimized nanocomposite film exhibited an impressive conductivity of 1903.2 S cm−1, which is among the highest values reported for MXene and cellulose-based nanocomposites. Owing to the superior conductivity and unique heterostructure, the nanocomposite film exhibits a high EMI SE value of 76.99 dB at a thickness of only 58.0 μm. Taking into account the robust mechanical properties and remarkable EMI shielding performance, the CNF/PEDOT:PSS/MXene nanocomposite film could be a prospective EMI shielding material for a variety of high-end applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Zhen Qin,Xiangyang Chen,Yuhuan Lv,Biao Zhao,Xiaohui Fang,Kai Pan
The emerging wearable electronics promote the rapid development of flexible piezoresistive sensors. However, it remains a big challenge to develop a high-performance piezoresistive sensor with high sensitivity, wide pressure range, and stable output. Here, an lightweight (17.33 mg cm −3 ) cellulose acetate nanofiber/sodium alginate synergistically enhanced MXene composite aerogel is fabricated through a liquid nitrogen-assisted unidirectional-freezing strategy. The conductive MXene-based aerogel possesses excellent mechanical performance and high compressive strength (16 kPa). Importantly, the unique synergies endow the aerogel assembled piezoresistive sensor with an ultra-high sensitivity up to 114.55 kPa −1 in a wide pressure range up to 21.78 kPa, and it can withstand more than 24,000 cycles of compression. More interestingly, the prepared sensor can be used to realize real-time monitoring of various human activities and developed as a wireless device to transmit information. The unparalleled sensing performance endows the MXene composite aerogel with a broad application prospect in the field of flexible intelligent wearable devices.
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Journal of Materials Chemistry C
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2022
·Vol. 10
·期 33
·11914-11923
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IF 8.067
Sheng-Ji Wang,Zhuo Chen,Xiangshu Hu,Jian Zou,Zhihui Xie,Hao-Yang Mi,Zi-Hao Liu,Zhi Zhang,Yinghui Shang,Xin Jing
Hydrogels combining good biocompatibility and super flexibility have attracted tremendous interest in flexible sensors. Nevertheless, they always suffer from poor stability due to their dehydration properties over a long period, leading to their limited service-life in practical applications. To address this problem, we proposed a facile strategy to prepare a highly stable polyacrylamide (PAM)/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)/MXene organohydrogel (PPMOH), in which ethylene glycol (Eg) is used as a bridge to enhance the interfacial bonding between the encapsulating layer and the PPMOH. On the other hand, LiCl was added to cooperate with the Eg to enhance the water retention ability of the organohydrogel, which exhibited excellent cycling stability (500 cycles) for as long as 90 days, and displayed good anti-freezing performance (−20 °C for 24 h). Moreover, MXene and PEDOT:PSS as well as the ions in the organohydrogel provided excellent sensitivity for the PPMOH, which demonstrated a high gauge factor of 4.71 and 10.69 in the range of 0–300% and 300–500%, respectively, as well as a fast response time of 100 ms. These multifunctional properties allow the prepared PPMOH to be used as a flexible strain sensor to detect both subtle and large deformation of human movements, which demonstrate great potential for use in human healthcare, intelligent robotics, and human–machine interface applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yafeng Chen,Ge Meng,Tao Yang,Chang Chen,Ziwei Chang,Fantao Kong,Han Tian,Xiangzhi Cui,Xinmei Hou,Jianlin Shi
Earth-abundant MoS 2 has attracted great attentions as a promising hydrogen evolution reaction (HER) electrocatalyst , but it is limited by sluggish water dissociation and strong adsorption of the oxygen-containing intermediates in alkaline media. Herein, an interfacial engineering strategy to fabricate Co-doped 1T-MoS 2 coupling with V 2 C MXene was reported to improve the HER kinetics of MoS 2 . DFT calculations predict that the construction of heterogeneous interfaces between V 2 C MXene and Co-doped 1T-MoS 2 can effectively reduce the energy barrier of water dissociation and optimize the free energy of hydrogen adsorption. As a result, the synthesized Co-MoS 2 /V 2 C@CC nanohybrid exhibits excellent HER performance with small overpotentials of 70.1, 263.2 and 296 mV to achieve current densities of 10, 500 and 1000 mA cm −2 , respectively, and outstanding stability for 50 h HER test without degradation. Additionally, the overall hydrazine-assisted water splitting (OHzS) system catalyzed by Co-MoS 2 /V 2 C@CC in both anode and cathode requires only 0.33 V to achieve a current density of 10 mA cm −2 with significant long-term durability.
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Energy & Environmental Materials
·
2022
·Vol. 6
·期 6
·e12454
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IF 13.443
Guoqiang Zhou,Xiao Wang,Ting Wan,Chaozheng Liu,Weimin Chen,Shaohua Jiang,Jingquan Han,Youguo Yan,Meichun Li,Changtong Mei
The titanium carbide nanosheets (MXene) hold great potential for fabricating high-performance electronics due to their two-dimensional layered structure, high electrical conductivity, and versatile surface chemistry. However, assembling the small MXene nanosheets into flexible macroscopic films for wearable electronics still remains a challenge. Herein, we report the hierarchical assembling of MXene nanosheets and cellulose nanofibers into high-performance composite films via an electrostatic self-assembly strategy induced by polyethyleneimine. Benefited from the nacre-like microstructure of MXene “bricks” and cellulose nanofibers “mortars” interlocked by polyethyleneimine via hydrogen bonding and electrostatic interaction, composite films possess integrated superior flexibility, high tensile strength, and stable electrical conductivity, which are advantageous for wearable electronic applications. To provide a proof-of-concept design, a symmetric quasi-solid-state supercapacitor with the as-prepared composite film as electrode is fabricated, which exhibits a specific capacitance of 93.9 mF cm −2 at a current density of 0.1 mA cm −2 and almost constant capacitive behavior under different bending states. In addition, the composite film possesses capacities of electrothermal conversion and complete degradation in a hydrogen peroxide solution. These results demonstrate that the electrostatically self-assembled composite films hold great promise in the development of highly flexible, mechanically robust, and environmentally friendly energy storage and conversion devices.
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高影响因子
AMINO ACIDS
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2022
·Vol. 54
·期 8
·1173-1181
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IF 3.789
Liu Cheng,Pan Hong,Hu Haoyun,Wei Wei,Lu Qiujun,Zhao Chenxi,Wang Haiyan,Du Fuyou
Vanadium carbide MXene (V 2 C) acts as a new type of two-dimensional (2D) graphene-like transition metal material that has attracted research interest. V 2 C has been widely used in various fields due to its excellent physical and chemical properties. Herein, the self-assembled V 2 C@gold nanoparticles (V 2 C@AuNPs) are prepared by water bath process at 80 °C. With the addition of glutathione (GSH), the absorbance (Abs.) at 550 nm of V 2 C@AuNPs was decreased. Therefore, an optical sensor is developed to detect GSH based on the properties of V 2 C@AuNPs. Under the optimal conditions, the detection range is 1–32 µM and the detection limit is 0.099 µM. Furthermore, the proposed GSH sensor exhibits high sensitivity, high selectivity, strong stability, and excellent recovery. The work will expand the application of V 2 C in biosensing.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tongtong Ma,Liping Li,Mingzhu Pan,Chuigen Guo,Changtong Mei
Design and development of multifunctional fire-resistant and fire alarm wallpaper (FAW) that can simultaneously hold early fire warning function and the ability to inhibit flame propagation is urgently required to boost the fire safety of combustible materials in public security. Herein, a flexible sandwich-like and nacre-biomimetic FAW was fabricated by using renewable lignocellulose nanofibrils (LCNF) and MXene thermosensitive sensor via a vacuum-assisted alternate self-assembly method. The FAW achieved ultrasensitive fire early warning response because of the synergistic effect of the insulating LCNF layers and highly conductive MXene with hierarchical structure sandwiched between LCNF layers. Furthermore, owing to the ultrafast catalytic char formation and intumescent flame retardant effect of ammonium polyphosphate (APP), the trigger sensitivity and thermal oxidation capacity of the FAW (LCNF-15) were greatly optimized by adding 15 % APP in the LCNF layer, resulting in a superior fire alarm response (0.32 s) and a continuous alarm signal (about 3073.0 s) under a flame attack. Besides, the LCNF-15 also exhibited good flexibility, ideal cyclic warning performance, excellent heat insulation ability and strong char-forming properties in a fire. The sandwich-like strategy offers a new platform for the construction of MXene-based multifunctional FAW, which is of great value in broadly addressing the fire hazard problem of traditional wallpapers.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 33
·2203704
·
IF 19.924
Dongfang Xu,Tong Li,Yu Han,Xuexia He,Shaomin Yang,Yuhang Che,Jie Xu,Hong Zou,Xi Guo,Jungang Wang,Xuruo Lei,Zhike Liu
CsPbI 3 inorganic perovskites have attracted significant attention due to their desirable bandgap for tandem solar cells and excellent thermal stability. However, CsPbI 3 perovskite solar cells (PSCs) still exhibit low efficiency and high energy loss due to nonradiative recombination. Herein, functionalized Ti 3 C 2 F x quantum dots (QDs) are prepared and selected as interface passivators to enhance the performance of CsPbI 3 PSCs. The systematic experimental results reveal that Ti 3 C 2 F x QDs serve as effective passivators mainly in three aspects: 1) p -type Ti 3 C 2 F x QDs can tune the energy level of perovskite films and provide an efficient pathway for hole transfer; 2) Ti 3 C 2 F x QDs can effectively passivate defects and reduce interfacial nonradiative recombination, and 3) Ti 3 C 2 F x QDs form a barrier layer to prevent water invasion and improve the stability of CsPbI 3 PSCs. Consequently, the champion CsPbI 3 PSC with Ti 3 C 2 F x QDs treatment exhibits an excellent efficiency of 20.44% with a high open-circuit voltage of 1.22 V. Meanwhile, the corresponding device without encapsulation retained 93% of its initial efficiency after 600 h of storage in ambient air.
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高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Zheng Bo,Zhesong Huang,Chenxuan Xu,Yucheng Chen,Erka Wu,Jianhua Yan,Kefa Cen,Huachao Yang,Kostya (Ken) Ostrikov
Capacitive deionization (CDI) is one of the most promising energy-efficient technologies for water desalination , however its industrial translation is slow and impeded by limited electrosorption capacity, slow electrosorption rate and poor cycling stability. Herein we address the above challenges by developing and validating a new concept of unimpeded and selective full-cell anion-cation separation using custom-designed anion-kinetics-selective anode and cation-energy-selective cathode. Nanoporous graphene anode enables the selective anion kinetics, while cation selectivity on the functionalized MXene cathode is due to the difference in ion adsorption energy . These mechanisms are validated by electrochemical quartz crystal microbalance measurements. The finely-tuned balance between ion transport and adsorption causes unimpeded ion diffusion, leading to the higher electrosorption rates. These effects are guided by the atomistic and quantum chemistry simulations, and also confirmed experimentally by tuning the pore size of graphene anode and the functionalization of MXene cathode. The fabricated asymmetric CDI cell exhibits superior electrosorption capacity of 49 mg g −1 and high electrosorption rate of 2.92 mg g −1 min −1 in 5000 mg L −1 NaCl solution as well as excellent cycling stability (100 cycles), which are among the best of the current state-of-the-art CDI studies. These results demonstrate the design of advanced electrode materials for the effective control of ion kinetics and energies to achieve selective ion transport, thus providing new insights for a broader range of energy-related applications.
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