Metals
·
2022
·Vol. 12
·期 12
·2022
·
IF 2.695
Buxiang Wang,Qing Shu,Haodong Chen,Xuyao Xing,Qiong Wu,Li Zhang
It remains a formidable challenge to prepare an economical and stable electrocatalyst for hydrogen evolution reaction using non-precious metals. In this study, MXene (Ti3C2Tx) nanosheets were prepared by high-energy ultrasound treatment, and Cu nanoparticles were prepared by NaBH4as a reducing agent. Then, the electrocatalyst Cu/Ti3C2Tx, suitable for hydrogen evolution reaction (HER), was prepared by supporting Cu with Ti3C2Tx. The structure, morphology, crystal phase and valence state of the obtained catalyst were determined by a variety of characterization analysis methods, and the influence of these properties on the catalytic performance is discussed here. The results of Brunner–Emmet–Teller (BET) showed that Ti3C2Txcan effectively inhibit Cu agglomeration. Results of Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) showed that Cu has metallic and oxidized states. X-ray Photoelectron Spectroscopy (XPS) further revealed the existence of multivalent states in Cu, which would contribute to the formation of electron transfer channels and the enhancement of electrocatalytic activity. In addition, the Cu/Ti3C2Txcatalyst has strong hydrophilicity, as measured by contact angle, which is conducive to HER. Ti3C2Txhas acceptable electrocatalytic hydrogen evolution performance: under alkaline conditions, when the current density is 10 mA cm−2, HER overpotential is as low as 128 mV and the Tafel slope is as low as 126 mV dec−1. Meanwhile, Ti3C2Txshowed adequate stability for HER (94.0% of the initial mass activity after 1000 CV cycles). This work offers insights into the development of high-performance non-precious metal-based catalysts to achieve the high performance of HER in alkaline electrolytes.Keywords:hydrogen evolution reaction;electrocatalyst;Cu;MXene (Ti3C2Tx) nanosheets
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
·
IF 3.7
Xu Zhang,Yanan Li,Yuting Yuan,Cuiming Wu,Xiaolin Wang,Yahua Liu,Xiaozhao Han
The main key component in bipolar membranes (BPMs) is the interfacial layer (IL), which is responsible for the water splitting. In this work, a most studied MXene Ti 3 C 2 T x and a modified Ti 3 C 2 T x (PANI-Ti 3 C 2 T x ) were investigated as the catalysts in ILs of BPMs. BPMs with Ti 3 C 2 T x /PANI-Ti 3 C 2 T x were prepared through the layer-by-layer casting/spraying method. The resulting BPMs were assessed through morphologies, thermal stability, alkali resistance performance, current-voltage (I-V) curves and water splitting performance in the bipolar membrane electrodialysis (BMED). Results show that the as-prepared BPMs exhibited excellent adhesion between layers, good thermal stability and alkali resistance performance. I-V curves showed that the voltage of the BPM with the PANI-Ti 3 C 2 T x addition content of 0.5% (BPM-PANI-Ti 3 C 2 T x -0.5%, ~7.0 V) at the current density of 80 mA·cm -2 was only half of that of the blank sample BPM-0 without any catalysts (~14.1 V). After the BMED operation, the final OH - concentration increment in the base chamber (∆ C OH ) and the energy consumption of the BPM-Ti 3 C 2 T x -1.0% membrane (0.089 mol·L -1 , 0.58 kWh·mol -1 ) were ~7% higher and ~29% lower than those of BPM-0 (0.083 mol·L -1 , 0.82 kWh·mol -1 ), respectively; BPM-Ti 3 C 2 T x -1.0% (0.089 mol·L -1 , 95%) showed a higher final ∆ C OH and current efficiency than the commercial membrane BP-1 (0.087 mol·L -1 , 93%), but a higher energy consumption (0.58 kWh·mol -1 ) than BP-1 (0.33 kWh·mol -1 ). This study suggests that MXenes have the advanced catalytic effect on water splitting occurs in ILs of BPMs.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Mustehsin Ali,Hongwei Shi,Faheem Jan,Sharjeel Ahmed,Yingwei Song,En-Hou Han
Ti 3 C 2 T x nanosheets, emerging as revolutionary 2D nanomaterials, have sparked interest in advanced applications due to their thin-layered architecture and promise as innovative nanofillers for a variety of applications. To address the oxidation and stacking of Ti 3 C 2 T x nanosheets with the polymer, a novel multifunctional Ti 3 C 2 T x -based nanocomposite is engineered by an etching method. The Ti 3 C 2 T x surface is functionalized with 3-aminopropyltriethoxysilane (APTES), and attapulgite (ATP) is implanted on the NH 2 -Ti 3 C 2 T x interface to lower the cohesive energy between nanosheets. The novel self-healing epoxy films were achieved by encapsulating self-healing components ((8-hydroxyquinoline (8-HQ) + 2-mercaptobenzothiazole (MBT)) in the ATP-based NH 2 -Ti 3 C 2 T x nanocomposite (AMQM). Inhibited AA2024-T3 surface revealed hydrophobic nature, whereas the pH sensitive coatings exhibited strong adherence to the substrate and improved compatibility and mechanical strength. The impedance of artificially scratched epoxy film rose from 0.073 M Ω cm 2 to 0.198 M Ω cm 2 (after 12 h) and from 0.027 M Ω cm 2 to 2.189 M Ω cm 2 (after 96 h) in comparison with the control samples. Simulations depict the presence of hydrogen bonds between the inhibitors and the 2024-T3 alloy, as well as twice the adsorption energy compared to the individual inhibitors. Therefore, a novel pH-sensitive self-healing coating offers a synergistic approach for promising corrosion suppression.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Junzheng Zhang,Jingjing Shi,Sheng Tao,Lei Wu,Jun Lu
Photocatalytic CO 2 reduction has been viewed as a promising approach to relieve the energy crisis and green-house effect. Cheap and high performance cocatalyst is an effective approach to enhance the photocatalytic activity . Ti 3 C 2 T x (MXene) is a new family of 2D layered materials, which can be served as an electron conductor. In this work, Cu 2 O/Ti 3 C 2 T x heterojunction composites were prepared by in situ hydrothermal growth method. Cu 2 O/Ti 3 C 2 T x with the different percentages of ultrathin Ti 3 C 2 T x (2, 5, 10, 20 and 30 mg) nanosheet in the heterostructured catalysts are noted as CuTi-X (X = 2, 5, 10, 20, 30). As prepared CuTi-10 exhibits the highest photocatalytic CO 2 reaction activity (17.55 μmol·g −1 ·h −1 for CO and 0.96 μmol·h −1 ·g −1 for CH 4 ), which is 3.1 and 4.0 times higher than that of pure Cu 2 O (5.73 μmol·g −1 ·h −1 for CO and 0.24 μmol·g −1 ·h −1 for CH 4 , respectively). The advantage of the in situ growth endows the Cu 2 O/Ti 3 C 2 T x heterojunction contact interface, which is conductive to the separation of photogenerated electrons-hole pairs. The main reason is analysed and can be attributed to that Ti 3 C 2 T x can served as an electron acceptor due to its excellent conductive properties, rendering that more photo generated electrons attend the CO 2 reduction reaction. This provides a strategy to construct the Cu 2 O/Ti 3 C 2 T x heterojunction for photocatalytic CO 2 reduction.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lijuan Yang,Xiaoyin Cao,Jie Cui,Yunjia Wang,Zhaoqi Zhu,Hanxue Sun,Weidong Liang,Jiyan Li,An Li
The accumulation of non-degradable microplastics (MPs) originated from the mass production and huge consumption of plastics of modern industry in the water environment has resulted in severe pollution problems globally. Herein, we report for the first time the preparation of holey Ti 3 C 2 Tx (h-Ti 3 C 2 Tx) membranes obtained by etching Co 3 O 4 nanoparticles embedded on Ti 3 C 2 Tx nanosheets followed by simple vacuum filtration using polymeric membranes as supporting matrix for efficient removal of MPs from wastewater. The h-Ti 3 C 2 Tx nanosheets exhibit a planar porous structure which present nano-holes with an average hole-size of 25 nm in diameter, which facilitated the construction of membranes with better water flux for the separation of MPs. Using fluorescent PS (FP) microspheres of different diameters as microplastic models, the obtained h-Ti 3 C 2 Tx membranes exhibited extremely high MPs removal performance (up to 99.3% under our conditions). Moreover, a large water flux of 196.7 L h −1 m −2 k Pa −1 can be obtained, which can compete or be larger than that of most of the membranes composed of untreated two-dimension nanomaterials. Due to the physicochemical stability, tremendous large water reflux, and the high MPs removal efficiency of h-Ti 3 C 2 Tx membranes, there may be a great potential for practical applications in the separation and removal of various contaminants such as MPs or suspended solids from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Kai-Ning Zhang,Cheng-Zhen Wang,Qiu-Feng Lü,Ming-Hui Chen
Functionalized two-dimensional Ti 3 C 2 T x (TN-EHL) was prepared as an effective adsorbent for removal of methylene blue dye (MB) and copper ions (Cu 2+ ). Enzymatic hydrolysis lignin (EHL), a reproducible natural resource, was used to functionalize the Ti 3 C 2 T x nanosheets. EHL can not only introduce active functional groups into TN-EHL but also prevent the oxidation of Ti 3 C 2 T x , thus promoting the adsorption performance of TN-EHL. The maximum adsorption capacities of TN-EHL50 (in which the EHL content is 50 wt%) for MB and Cu 2+ were 293.7 mg g −1 and 49.96 mg g −1 , respectively. The higher correlation coefficients ( R 2 ) of MB (0.9996) and Cu 2+ (0.9995) indicating that their adsorption processes can be described by the pseudo-second-order kinetic model. The MB adsorption data fit the Freundlich isotherm with R 2 of 0.9953, whereas the Cu 2+ ions adsorption data fit the Langmuir isotherm with R 2 of 0.9998. The thermodynamic analysis indicates that the adsorption process of MB and Cu 2+ on TN-EHL50 is spontaneous and endothermic. Significantly, the Cu 2+ ions were reduced to Cu 2 O and CuO particles during the adsorption process. Therefore, TN-EHL has a great potential as an environmentally friendly adsorbent for MB removal and recovery of Cu 2+ ions from wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 20
·2777
·
IF 5.3
Zhenhua Feng,Chengwen Liu,Binbin Tang,Xiaojun Yang,Wenjie Jiang,Peng Wang,Xianjun Tang,Hongshan Wang,Xiangdong Zeng,Guangyong Zeng
Graphene oxide (GO) two-dimensional (2D) membranes with unique layer structures and tunable layer spacing have special advantages and great potential in the field of water treatment. However, GO membranes face the issues of weak anti-swelling ability as well as poor permeability. We prepared GO/Ti3C2TX2D composite membranes with 2D/2D structures by intercalating Ti3C2TXnanosheets with slightly smaller sizes into GO membranes. Ti3C2TXintercalation can effectively expand the layer spacing of GO, thereby substantially enhancing the flux of the composite membrane (2.82 to 6.35 L·m−2·h−1). Moreover, the GO/Ti3C2TXcomposite membrane exhibited a good Mg2+/Li+separation capability. For the simulated brine, the separation factor of M2 was 3.81, and the salt solution flux was as high as 5.26 L·m−2·h−1. Meanwhile, the incorporation of Ti3C2TXnanosheets significantly improved the stability of GO/Ti3C2TXmembranes in different pH environments. This study provides a unique insight into the preparation of highly permeable and ion-selective GO membranes.Keywords:graphene oxide;Ti3C2TXnanosheets;two-dimensional materials membrane;Mg2+/Li+separation
研究领域:
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huanhuan Niu,Xueyang Tu,Shuang Zhang,Yaya Li,Hailong Wang,Gang Shao,Rui Zhang,Hongxia Li,Biao Zhao,Bingbing Fan
Ti 3 C 2 T x nanosheets are attractive for electromagnetic wave absorption (EMA) materials requiring ultra-thin and high-performance due to their high conductivity and polarizability. However, the self-restacking of Ti 3 C 2 T x nanosheets unavoidably decreases the number of active sites, specific surface area, and conductivity. Herein, a simple strategy is developed to prepare a core–shell structure of SiO 2 @Ti 3 C 2 T x by electrostatic assembly and hydrogen bonding. SiO 2 spheres as templates cannot only prevent Ti 3 C 2 T x nanosheets from further stacking, but also modulate the surface impedance and significantly increase interfacial polarization loss. The resulted SiO 2 @Ti 3 C 2 T x composite can deliver superior absorption capacity with minimum reflection coefficient (RL) of −58.01 dB at an ultra-thin thickness of only 1.3 mm. The absorption efficiency is calculated over 99.999 % with an effective absorption bandwidth (EAB) of 3.44 GHz. Furthermore, with increasing amounts of SiO 2 templates, the EAB can be broadened up to 15.04 GHz (2.96–18 GHz) in the thickness range of 1–3 mm. The absorption mechanisms are described based on multiple reflection, polarization behaviors, tunable impedance matching, and conduction loss. The present work could pave a way for obtaining ultra-thin, high-performance MXene-based EMA materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xudong Liu,Yong Liu,Shangli Dong,Xuefeng Zhang,Yidan Wei,Lu Lv,Sirui He
Channel (hole and interlayer) engineering on two-dimensional (2D) MXenes has been proven to be an effective strategy to solve the issues of congested ion transport pathways, limited active sites, and sluggish ion transport kinetics caused by restacking of MXene nanosheets, which extended the application in the field of energy storage. Herein, a simple channel engineering strategy was proposed to treat the long-term stored Ti3C2Tx nanosheets, resulting in formation of an interlayer-expanded holey Ti3C2Tx film via etching out Ti3C2Tx oxides. The in situ oxides expanded the interlayer spacing and created holes on the Ti3C2Tx nanosheets, which formed channels in all directions. The interlayer-expanded holey Ti3C2Tx film showed outstanding electrochemical performance, with both high capacity (448 F g–1 at 2 mV s–1) and good cyclic stability (95.3% retention after 5000 cycles). Importantly, this strategy effectively recycles the waste MXenes that are oxidized by long-term storage, which embodies the concept of low carbon and environmental protection and promotes the industrialization process of MXenes.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Qingping Xin,Tao Huang,Shuo Li,Ningning Gao,Huimin Jin,Hao Chen,Lei Zhang,Hui Ye,Hong Li,Yuzhong Zhang
The membrane separation approach has garnered considerable interest in the area of CO2 separation due to its advantages of requiring little electricity and a wide range of applications. Here, we report the preparation of pSBMA@Ti3C2Tx nanosheets functionalized with poly(amphiphilic poly(methacryloyloxyethylsulfobetaine) (pSBMA)) by precipitation distillation, weighing of pSBMA@Ti3C2Tx nanosheets with different mass ratios to be added into cross-linked poly(ethylene oxide) (XLPEO), and preparation of a continuous, thin mixed-matrix membrane (MMM). Under gas humidification, the membrane showed the best permeation performance. Due to the richness of hydrophilic organosulfate groups (−SO3–) and quaternary amine groups [−N+(CH3)3] in pSBMA, the overall water content of the MMMs is increased, which greatly improves the CO2 permeability. Enhancing the ratio of bound water augments the membrane’s capacity to segregate CO2/N2. Under coordination of water molecules, quaternary amine groups effectively promote the quick delivery of CO2 in the membrane. In the wet state, the XLPEO/pSBMA@Ti3C2Tx-0.2 membrane has a CO2/N2 selectivity of 27.5 and a CO2 permeability of 4953 barrer, an improvement of 87% and 109%, respectively, compared to those of the XLPEO pure membrane, breaking the 2008 Robeson upper limit and approaching the 2019 upper limit. We also studied the change of the gas separation performance of the membrane under different pressures.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Chong Li,Ran Tao,Jianlei Zhang,Jinlong Chen,Chen Fu,Jikai Zhang,Huiling Ong,Chenze Lu,Yi Chen,Qiang Wu,Jing-Ting Luo,Yongqing Fu
Along with the revolution of the Internet of Things (IoT), smart, flexible, easily fabricated, and highly sensitive gas sensors are essential for many portable electronics. In this study, a wearable NO2 sensor based on a nanomesh structure woven with Ti3C2Tx microflakes and Bi2S3 nanobelts operated at room temperature was successfully designed and prepared. The effects of the mass ratio between two materials on the performance were evaluated. Bi2S3 nanobelts embedded inside accordion-like Ti3C2Tx provide large specific surface areas and abundant active sites for the adsorption of NO2 molecules. Attributed to the high conductivity of Ti3C2Tx, the carriers generated in the sensitive layers are easily transmitted during sensing, thus significantly reducing the response and recovery times. The sensor based on the nanomesh containing 30 wt % Ti3C2Tx exhibits excellent sensing performance, fast response/recovery rates, and high stability even in arbitrary deformed shape conditions. Upon exposure to 1 ppm NO2, the response of the sensor is 12.67, and the response/recovery times are 5/28 s, respectively. A stable sensing performance can be maintained after 1500 cycles of deformation. This work demonstrates a simple but reliable manufacturing strategy of wearable gas sensors for the next generation of IoT monitoring network-linking human activities.
研究领域:
材料科学
·
传感器技术
·
物联网应用
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 47
·24196-24205
·
IF 6.895
Heng Zhang,Peigen Zhang,Long Pan,Wei He,Qi Qi,Zhuoheng Bao,Li Yang,Wei Zhang,Michel W. Barsoum,ZhengMing Sun
Lithium–sulfur (Li–S) batteries are regarded as potential next-generation energy storage systems due to their high theoretical energy densities. However, the dissolution of lithium polysulfides (LiPSs) upon cycling can result in severe capacity degradation. Achieving high rate capabilities with good cycling stability remains a huge obstacle for the practical implementation of Li–S batteries. Here we developed a novel, multifunctional, hierarchical structure by self-assembling core–shell MnO2 nanorods @ hollow porous carbon with 2D Ti3C2Tx nanosheets, labelled as MCT, as an efficient polysulfide mediator for Li–S cathodes. The integration of the polar MnO2 core and hollow porous carbon shell captures LiPSs two ways: physical confinement and chemisorption. The conductive Ti3C2Tx nanosheets construct a continuous and conductive network, which not only promotes charge transfer and ion diffusion but also boosts LiPS adsorption and conversion. Based on these merits, the MCT/S cathode delivers good rate capability (688 mA h g−1 at 2.0C) and outstanding long-term cyclability (0.044% capacity decay per cycle over 600 cycles at 2.0C).
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）