ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Fengshou Yu,Zhixiang Zhou,Yang You,Jiayu Zhan,Tong Yao,Lu-Hua Zhang
Precise electronic state regulation through coordination environment optimization by metal–support interaction is a promising strategy to facilitate catalysis reaction, while the limited density of functional groups in the bulk substrate restricts the regulation degree. Herein, different sizes of Ti3C2Tx MXene with hydroxyl (−OH) terminal including the MXene layer (ML-OH, 3 μm), the MXene nanosheet (MNS-OH, 600 nm), and the MXene quantum dot (MQD-OH, 8 nm) were prepared to anchor CoPc, and the effect of −OH density on the performance of electrochemical CO2 reduction was systematically investigated. Notably, a linear relationship was established by plotting reactivity vs hydroxyl density. With the highest −OH density, CoPc/MQD-OH exhibits a superior Faradaic efficiency for CO formation (FECO) of ∼100% at −0.9 to −1.0 V vs RHE and a high FECO of >90% over a wide potential window from −0.8 to −1.4 V. The mechanism exploration shows that the axial coordination interaction of the −OH terminal with Co increases the electron density of the Co site, thus promoting the adsorption and activation of CO2. This work provides a new insight into designing of molecular catalysts with high efficiency and tunable structure for other electrochemical conversions.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yanhua Ma,Dongzhi Zhang,Zihu Wang,Hao Zhang,Hui Xia,Ruiyuan Mao,Haolin Cai,Huixin Luan
Flexible strain sensors based on self-adhesive, high-tensile, super-sensitive conductive hydrogels have promising application in human–computer interaction and motion monitoring. Traditional strain sensors have difficulty in balancing mechanical strength, detection function, and sensitivity, which brings challenges to their practical applications. In this work, the double network hydrogel composed of polyacrylamide (PAM) and sodium alginate (SA) was prepared, and MXene and sucrose were used as conductive materials and network reinforcing materials, respectively. Sucrose can effectively enhance the mechanical performance of the hydrogels and improve the ability to withstand harsh conditions. The hydrogel strain sensor has excellent tensile properties (strain >2500%), high sensitivity with a gauge factor of 3.76 at 1400% strain, reliable repeatability, self-adhesion, and anti-freezing ability. Highly sensitive hydrogels can be assembled into motion detection sensors that can distinguish between various strong or subtle movements of the human body, such as joint flexion and throat vibration. In addition, the sensor can be applied in handwriting recognition of English letters by using the fully convolutional network (FCN) algorithm and achieved the high accuracy of 98.1% for handwriting recognition. The as-prepared hydrogel strain sensor has broad prospect in motion detection and human–machine interaction, which provides great potential application of flexible wearable devices.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhenyuan Xu,Dongzhi Zhang,Zheng Li,Chen Du,Yan Yang,Bao Zhang,Wenhao Zhao
Flexible wearable sensors to monitor human movement and for electronic skins must exhibit high sensitivity, a wide detection range, and waterproof characteristics. This work reports a flexible, highly sensitive, and waterproof sponge pressure sensor (SMCM). The sensor is made by assembling SiO2 (S), MXene (M), and NH2-CNTs (C) on the backbone of melamine sponge (M). The SMCM sensor exhibits excellent sensitivity (10.8 kPa–1), an ultra-short response/recovery time (40 ms/60 ms), a wide detection range (30 kPa), and an extremely low detection limit (4.6 Pa). Benefiting from layer-by-layer self-assembly, the sensor still exhibits excellent stability after 5000 cycles. In addition, the SMCM sensor also has excellent waterproof performance (a water contact angle of 142°), enabling it to operate unaffectedly under wet conditions. The SMCM sensor can accurately detect small body movements such as pulse and swallowing while also accurately detecting finger and elbow movements. In addition, the sensor can be designed as an array to construct an electronic skin for detecting the magnitude and distribution of external pressure. This work holds great application potential in next-generation electronic skin, fitness detection, and flexible pressure sensors.
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Engineering
·
2023
·
IF 12.8
Jianzhong Ma,Li Ma,Lei Zhang,Wenbo Zhang,Qianqian Fan,Buxing Han
This study presents a solvent-free, facile synthesis of a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin (MV) using vanillin. The resulting MV not only imparted antibacterial properties to coatings layered on leather, but could also be employed as a green alternative to petroleum-based carcinogen styrene (St). Herein, MV was copolymerized with butyl acrylate (BA) to obtain waterborne bio-based P(MV–BA) miniemulsion via miniemulsion polymerization. Subsequently, MXene nanosheets with excellent photothermal conversion performance and antibacterial properties, were introduced into the P(MV–BA) miniemulsion by ultrasonic dispersion. During the gradual solidification of P(MV–BA)/MXene nanocomposite miniemulsion on the leather surface, MXene gradually migrated to the surface of leather coatings due to the cavitation effect of ultrasonication and amphiphilicity of MXene, which prompted its full exposure to light and bacteria, exerting the maximum photothermal conversion efficiency and significant antibacterial efficacy. In particular, when the dosage of MXene nanosheets was 1.4 wt%, the surface temperature of P(MV–BA)/MXene nanocomposite miniemulsion-coated leather (PML) increased by about 15 °C in an outdoor environment during winter, and the antibacterial rate against Escherichia coli and Staphylococcus aureus was nearly 100% under the simulated sunlight treatment for 30 min. Moreover, the introduction of MXene nanosheets increased the air permeability, water vapor permeability, and thermal stability of these coatings. This study provides a new insight into the preparation of novel, green, and waterborne bio-based nanocomposite coatings for leather, with desired warmth retention and antibacterial properties. It can not only realize zero-carbon heating based on sunlight in winter, reducing the use of fossil fuels and greenhouse gas emissions, but also improve ability to fight off invasion by harmful bacteria, viruses, and other microorganisms.
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COMPOSITES COMMUNICATIONS
·
2023
·
IF 8
Wenting Tao,Meng Ma,Xianjun Liao,Wenqin Shao,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
Conductive polymer composites (CPCs) have always attracted great attention in the development of electromagnetic shielding materials. However, how to solve the conflict between high electromagnetic (EM) waves reflection and high electromagnetic interference (EMI) shielding performance brought by conductive fillers is becoming an urgent problem. In this study, a homogeneous composite film with porous structure was constructed by vacuum filtration using cellulose nanofibers (CNF), MXene , and mesoporous carbon hollow spheres (MCHS). Benefiting from the porous structure, the impedance match between the composite film and the air was improved, thereby reducing the reflection of electromagnetic waves. In addition, the hollow porous structure of MCHS was beneficial to the multiple reflections and interfacial losses of EM waves in its pores and between the interfaces of MXene and MCHS, thereby further reducing the EM waves reflection. The obtained CNF/MXene/MCHS composite film with 10 wt% MCHS exhibits electromagnetic interference shielding effectiveness (EMI SE) of 24.6 dB, the reflection value (R) become 0.72, and the reflection effectiveness drops to 5.5 dB, which greatly improved the absorption of electromagnetic waves while meeting the commercial application standards. Hence, the preparation strategy of this work provides a concise, efficient, and controllable method for the subsequent development of low-reflection porous structured composite films.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yingnan Yang,Haifeng Yang,Pengfei Tang,Xiaodong Li,Weimiao Wang,Guangcheng Yang
Laser induced high temperature pulse (HTP) generation has been widely used in some high-immediacy applications requiring dramatic temperature changes. Recent years researchers put interest in light-to-heat (include photothermal, light induced exothermic reaction and combination of both) materials to reduce the initiating energy of the laser ignition. However, the laser energy for realizing sufficient light-to-heat conversion is still high. MXene exhibits excellent light absorption, high light-to-heat conversion efficiency and has abundant metastable atoms which trend to undergo exothermic chemical reactions, but its incomplete oxidation affects its total heat release when the laser power is relatively high. Herein, we have prepared a ZIF-67/Ti 3 C 2 MXene intercalated membrane. It is found that porous ZIF-67 exhibits a synergistic effect on MXene and can significantly improve its physical/chemical coupled HTP by enhancing its light absorption and subsequent energy release during its oxidation. ε 2,4,6,8,10,12-(hexanitrohexaaza) cyclododecane (ε-CL-20) laser ignition experiments prove that ZIF-67/Ti 3 C 2 MXene intercalated membrane exhibits better ignition performance than pure MXene membrane by reducing both ignition threshold (151.2 mJ) and ignition delay (21 ms) at a low laser power intensity (59.7 W/cm 2 ). This work can provide an insight for the structural design of new light-to-heat membranes.
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CELLULOSE
·
2023
·Vol. 30
·期 7
·4373-4385
·
IF 5.7
Zhang Tianyi,Song Baiqing,Yang Jie,Yuan Binbin,Ma Jianhua
Multifunctional films have potential applications in smart wearable devices and portable electronic products. Yet, it is always a challenge to ensure these materials simultaneously to have flexible, strong, and functional properties during the material preparation process. Herein, bacterial cellulose/polydopamine modified by MXene (BC/PM) multi-layer films is prepared by vacuum-assisted self-assembly. The micromorphology, phase composition, and application performance of this composite film were systematically characterized. The mechanical properties test indicates that the BC/PM multi-layer film exhibits an excellent reinforcement effect. The tensile strength and elongation of the three-layer BC/PM film reach 181.6 MPa and 8.9%, respectively. For multifunctional applications, the BC/PM multi-layer film shows remarkable electric heating and excellent photothermal properties, for example, it can be heated up to 85 °C at a constant voltage of 6 V for 20 s, and its temperature can increase from room temperature to 90 ℃ after 250 W infrared lamp is irradiated for 30 s. Furthermore, the sample has potential high sensitivity and high response speed to humidity changes. This research will provide a data basis and theoretical reference for the practical application of bacterial cellulose-based multifunctional films.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Chao Liu,Wen Xiao,Guiyun Yu,Qiang Wang,Jiawei Hu,Chenghao Xu,Xinyi Du,Jianguang Xu,Qinfang Zhang,Zhigang Zou
Developing efficient heterojunction photocatalysts that have a high charge carrier separation rate and improved light-harvesting capacity is a crucial step in solving energy crisis and reducing environmental pollution. Herein, we synthesized few-layered Ti 3 C 2 MXene sheets (MXs) by a manual shaking process, and combined with CdIn 2 S 4 (CIS) to construct novel Ti 3 C 2 MXene/CdIn 2 S 4 (MXCIS) Schottky heterojunction through a solvothermal method. The strong interface between two-dimensional (2D) Ti 3 C 2 MXene and 2D CIS nanoplates led to enhanced light-harvesting capacity and promoted charge separation rate. Additionally, the presence of S vacancies on the MXCIS surface helped to trap free electrons. The optimal sample, 5-MXCIS (with 5 wt% MXs loading), exhibited outstanding performance for photocatalytic hydrogen (H 2 ) evolution and Cr(VI) reduction under visible light due to the synergistic effect of enhanced light-harvesting capacity and charge separation rate. The charge transfer kinetics was thoroughly studied using multiple techniques. The reactive species of • O 2 − , • OH and h + were generated in 5-MXCIS system, and e − and • O 2 − radicals were found to be the main contributors to Cr(VI) photoreduction. Based on the characterization results, a possible photocatalytic mechanism for H 2 evolution and Cr(VI) reduction was proposed. On the whole, this work provides new insights into the design of 2D/2D MXene-based Schottky heterojunction photocatalysts for boosting photocatalytic efficiency.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-14
·
IF 26.6
Xu Ting,Song Qun,Liu Kun,Liu Huayu,Pan Junjie,Liu Wei,Dai Lin,Zhang Meng,Wang Yaxuan,Si Chuanling,Du Haishun,Zhang Kai
Multifunctional architecture with intriguing structural design is highly desired for realizing the promising performances in wearable sensors and flexible energy storage devices. Cellulose nanofiber (CNF) is employed for assisting in building conductive, hyperelastic, and ultralight Ti 3 C 2 T x MXene hybrid aerogels with oriented tracheid-like texture. The biomimetic hybrid aerogels are constructed by a facile bidirectional freezing strategy with CNF, carbon nanotube (CNT), and MXene based on synergistic electrostatic interaction and hydrogen bonding. Entangled CNF and CNT “mortars” bonded with MXene “bricks” of the tracheid structure produce good interfacial binding, and superior mechanical strength (up to 80% compressibility and extraordinary fatigue resistance of 1000 cycles at 50% strain). Benefiting from the biomimetic texture, CNF/CNT/MXene aerogel shows ultralow density of 7.48 mg cm −3 and excellent electrical conductivity (~ 2400 S m −1 ). Used as pressure sensors, such aerogels exhibit appealing sensitivity performance with the linear sensitivity up to 817.3 kPa −1 , which affords their application in monitoring body surface information and detecting human motion. Furthermore, the aerogels can also act as electrode materials of compressive solid-state supercapacitors that reveal satisfactory electrochemical performance (849.2 mF cm −2 at 0.8 mA cm −2 ) and superior long cycle compression performance (88% after 10,000 cycles at a compressive strain of 30%).
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CELLULOSE
·
2023
·Vol. 30
·期 8
·5171-5185
·
IF 5.7
Zhao Bencheng,Li Chengze,Chen Yongfang,Tian Qiong,Yurekli Yılmaz,Qiu Fengxian,Zhang Tao
To handle the increasingly harsh living space caused by extreme temperatures and floods of electromagnetic waves, wearable materials have been attracting much attention for decades due to their good versatile compatibility and precise utility. In this work, a Janus MXene/cellulose/ZnO nanorods membrane for accurate on-demand personal thermal management and electromagnetic interference shielding was fabricated via hydrothermal treatment and vacuum-assisted filtration, followed by a hydrophobization process. The ZnO nanorod side of obtained Janus membrane exhibits a high visible reflectance (96.3%) and infrared emissivity in the atmospheric window band (0.837). The corresponding visible absorption and average infrared reflectivity (5–25 μm in wavelength) of the MXene side are over 90% and 0.7, respectively. Remarkable temperature differences on both sides (7 °C increment on MXene side and 5 °C reduction on ZnO side compared to bare wooden board) were achieved in the validation test under direct sunshine, reflecting to the great optical properties and radiative thermal management performances of the obtained membrane. Moreover, the water contact angles (≥ 120°) indicated the hydrophobicity and associated stain resistance of this membrane. Active Joule heating and electromagnetic interference shielding characteristics have been successfully introduced into the Janus membrane by means of the integration of MXene. A rapid increase in temperature to 75 °C was attained within a 1 min of low voltage (2 V) applying. The effectiveness of the electromagnetic shielding (~ 30 dB) was higher than the commercial shielding materials. The results in general, provide a promising solution to protecting people from temperature extremes and electromagnetic waves interference in modern living space.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Linsen Li,Xiang Gong,Zhuwei Yang,Riguang Zhang,Zhao Jiang,Tao Fang
As the candidates for large-scale hydrogen storage , liquid organic hydrogen carriers (LOHCs) exhibit evident advantages in hydrogen storage density and convenience of storage and transportation. Among them, NECZ (N-ethylcarbazole)/12H-NECZ (dodecahydro-N-ethylcarbazole) is considered as a typical system with the lower hydrogenation/dehydrogenation temperature. However, the low dehydrogenation efficiency restrict its commercial applications. In this work, the single-layer Ti 3 C 2 T x MXene was employed as the support to load the Pt nanoparticles for the 12H-NECZ dehydrogenation reaction. The effect of transition metals , loading amounts and morphologies of catalysts were analyzed. It was found that the 3 wt% Pt/S–Ti 3 C 2 T x catalyst exhibited the best catalytic performance with 100% conversion, 91.55% selectivity of NECZ and 5.62 wt% hydrogen release amount at 453 K, 101.325 kPa for 7 h. The product distributions and kinetics analysis suggested that the elementary reaction from 4H-NECZ to NECZ was the rate-limiting step. The selectivity of NECZ is sensitive to the dehydrogenation temperature. Combined with the XRD , SEM , HRTEM , XPS , BET and FT-IR results, it could be indicated that the special two-dimension structure of S–Ti 3 C 2 T x and electronic effect between Pt and S–Ti 3 C 2 T x enhanced the dehydrogenation efficiency of 12H-NECZ. The measurements of cyclic dehydrogenation indicated that the Pt/S–Ti 3 C 2 T x catalyst exhibited good stability after 42 h. This work brought a new strategy for the design of efficient catalysts using two-dimensional materials in the applications of the liquid organic storage hydrogen technology .
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Qingbo Xu,Xinyu Wang,Yanyan Zhang,Peng Wang,Zhi Liu,Qingping Song,Yanyan Sun
Conductive and thermal cotton fabrics have a great potential in the field of wearable textiles, in particular, warm textiles. However, poor durability and low wearability have hindered the practical application of conductive and thermal cotton fabrics. In this study, a cotton fabric with excellent conductive and thermal properties was prepared by coating with silver nanoparticles (Ag NPs), MXene , and polydimethylsiloxane (PDMS). The Ag NPs and MXene coatings endowed the cotton fabric with excellent conductive and thermal properties, while the PDMS coating endowed the conductive and thermal fabric with mechanical and chemical durability. As a result, the surface resistance of the finished cotton fabric reached 23.4 ± 1.7 Ω/sq, exhibiting excellent conductive properties. In addition, the temperature of the cotton fabric was improved a short time (<96.0 s) after the application of a low voltage, and the temperature increase of the fabric could be controlled by adjusting the time. Moreover, the inherent properties of the finished cotton fabric were retained to a significant extent after the finishing process. Therefore, it is believed that the fabricated cotton fabric has great potential for application in conductive and warm textiles.
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