JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Zifan Li,Zhibin Zhang,Zhimin Dong,Yongchuan Wu,Xiang Zhu,Zhongping Cheng,Yuhui Liu,Yingcai Wang,Zhijian Zheng,Xiaohong Cao,Youqun Wang,Yunhai Liu
The separation of uranium U(VI) through photoreduction approach has attracted substantial attention. Sulfide-based materials have revealed excellent performance for reducing U(VI) and there is no record of CuS based materials. Herein, we synthesized CuS/TNTAs heterostructured nanocomposites (CUTN) with varied CuS contents via successive ionic layer adsorption and reaction (SILAR) method. After SILAR deposition for 10 times, CUTN-10 showed the best photocatalytic performance, and 92.6 % of U(VI) can be removed within 180 min. The CuS could provide sufficient photoelectrons and TNTAs can transport these photoelectrons to the adsorbed U(VI) on its surface, the reduced uranium sediment was proved to be (UO 2 ) O 2 ·2H 2 O. More important, the combination of TNTAs could effective inhibit photocorrosion of CuS and the leaching of Cu 2+ was relatively low. We also unconsciously found that CUTN-10 can photoreduce U(VI) without any sacrificial agent which caused by the oxidation of S 2− . This work expands the application of sulfide-based materials and provides basic data for bracing the expansion of sulfide-based materials in the field of U(VI) photoreduction.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Lei Liu,Ziqiang Cheng,Bei Jiang,Yanxin Liu,Yanli Zhang,Fan Yang,Jiahong Wang,Xue-Feng Yu,Paul K. Chu,Cong Ye
The memristor is a foundational device for an artificial synapse, which is essential to realize next-generation neuromorphic computing. Herein, an optoelectronic memristor based on a two-dimensional (2D) transitional-metal trichalcogenide (TMTC) is designed and demonstrated. Owing to the excellent optical and electrical characteristics of titanium trisulfide (TiS3), the memristor exhibits stable bipolar resistance switching (RS) as a result of the controllable formation and rupturing of the conductive aluminum filaments. Multilevel storage is realized with light of multiple wavelengths between 400 and 808 nm, and the synaptic properties such as conduction modulation and spiking timing-dependent plasticity (STDP) are achieved. On the basis of the photonic potentiation and electrical habitual ability, Pavlovian-associative learning is successfully established on this TiS3-based artificial synapse. All these results reveal the large potential of 2D TMTCs in artificial neuromorphic chips.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Xiaoming Wang,Qianqian Peng,Xilin Zhang,Xucheng Lv,Xin Wang,Yongzhu Fu
Refractory high-entropy alloy nanocomposites (HEA-NPs) are important class of materials with unique structure and potential applications. Although several synthetic methods have been reported, developing novel routes to prepare nanoscale HEA-based catalysts facilely is still urgently desired. This work takes advantage of confinement assisted arc and plasma shock (APS) to prepare a series of HEA-NPs by regulating the type and proportion of metal precursors. The phase constitutes and morphology of the HEA-NPs are fully characterized. The prepared refractory HEA-NPs possesses five highly dispersed metal components, including titanium (Ti), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo) and simultaneously exhibits an uniform hexagonal morphology of nanocrystals . By taking advantage of its unique corrosion resistance , TiNbTaCrMo HEA-NPs can function as a promising candidate for electrocatalytic hydrogen evolution reaction (HER) in natural seawater . And its catalytic performance after alloying is significantly enhanced compared with the elemental metal. Theoretically, the promoted HER activity can be attributed to the strong adsorption for the various metal components in HEA-NPs caused by the upshifting d -band center close to the Fermi level . Furthermore, this confinement strategy can be further extended to synthesize other HEA-NPs. Our strategy provides a novel method to synthesize various HEA-NPs for further catalytic application.
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高影响因子
Small
·
2021
·Vol. 17
·期 40
·2103239
·
IF 13.281
Yanhong Duo,Guanghong Luo,Zihuang Li,Zide Chen,Xianming Li,Zhenyou Jiang,Binlu Yu,Hao Huang,Zhengbo Sun,Xue-feng Yu
Nanomaterial-based photothermal and photocatalytic therapies are effective against various types of cancers. However, combining two or more materials is considered necessary to achieve the synergistic anticancer effects of photothermal and photocatalytic therapy, which made the preparation process complicated. Herein, the authors describe simple 2D titanium diselenide (TiSe 2 ) nanosheets (NSs) that can couple photothermal therapy with photocatalytic therapy. The TiSe 2 NSs are prepared using a liquid exfoliation method. They show a layered structure and possess high photothermal conversion efficiency (65.58%) and good biocompatibility. Notably, upon near-infrared irradiation, these NSs exhibit good photocatalytic properties with enhanced reactive oxygen species generation and H 2 O 2 decomposition in vitro. They can also achieve high temperatures, with heat improving their catalytic ability to further amplify oxidative stress and glutathione depletion in cancer cells. Furthermore, molecular mechanism studies reveal that the synergistic effects of photothermal and enhanced photocatalytic therapy can simultaneously lead to apoptosis and necrosis in cancer cells via the HSP90/JAK3/NF-κB/IKB-α/Caspase-3 pathway. Systemic exploration reveals that the TiSe 2 NSs has an appreciable degradation rate and accumulates passively in tumor tissue, where they facilitate photothermal and photocatalytic effects without obvious toxicity. Their study thus indicates the high potential of biodegradable TiSe 2 NSs in synergistic phototherapy for cancer treatment.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yefeng Feng,Peiyao Chen,Bingshuang Mao,Maolin Bo,Qihuang Deng
Ultrahigh dielectric constant is obtained in polymer/MXene composites due to percolation . However, huge dielectric loss is triggered owing to high leakage current . In this work, hybrid filler consisting of Ti 2 C MXene and ZrO 2 was prepared for coordinating high dielectric constant and low dielectric loss in composites. Instead of Ti 2 C percolation, Ti 2 C/ZrO 2 interface effect mildly increased dielectric constant. Ultrahigh insulation and large aspect ratio of ZrO 2 fibers significantly reduced dielectric loss. Binary polymer/Ti 2 C and ternary polymer/Ti 2 C-ZrO 2 composites were fabricated, and better overall electric traits in ternary system were found. Ti 2 C/ZrO 2 interface effect was studied using density functional theory (DFT) calculations. Ternary composite with 12 wt% filler exhibited high dielectric constant of ~40, low dielectric loss of ~0.09 at 100 Hz and high breakdown strength of ~155 MV m −1 . This work might impulse fabrication of MXene-based hybrid fillers for dielectrics.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yiming Zhang,Yubing Si,Wei Guo,Xiang Li,Shuai Tang,Zhaoxin Zhang,Xin Wang,Yongzhu Fu
The practical application of lithium–sulfur batteries (LSBs) is partially impeded by large volume variation, severe shuttle effect, and inferior electrical conductivity of sulfur. On this account, a template-free arc-discharge method for the synthesis of TiSx (1.5 < x < 2)@HCN (hollow carbon nanocage) as an efficient sulfur host is developed for LSBs. TiSx@HCN can accommodate the volume changes of active materials and inhibit the shuttle effect of lithium polysulfides (LiPSs). Theoretical calculation shows that the defective titanium sulfide accelerates the conversion of long-chain LiPSs to intermediate species and promotes the redox reactions. As a consequence, the resulting hybrid cathode composited with sulfur exhibits excellent electrochemical performances. A reversible capacity of 1118.6 mA h g–1 is obtained under 0.1 C with a slow capacity decay of 0.108% per cycle for 200 cycles. The synthetic strategy provides a facile platform for the synthesis of nanocomposite materials.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaoqing Bin,Yapeng Tian,Yangyang Luo,Minhao Sheng,Yijia Luo,Maomao Ju,Wenxiu Que
In order to obtain high-performance flexible electrodes for supercapacitors, the nitrogen-doped delaminated-Ti 3 C 2 T x (N-d-Ti 3 C 2 T x ) decorated with MoO x nanoparticles (N-d-Ti 3 C 2 T x /MoO x ) films are prepared by a one-step solvothermal method. The N-d-Ti 3 C 2 T x nanosheets with high conductivity can facilitate electron transfer during the charge and discharge process, and the MoO x nanoparticles can contribute to high pseudocapacitance. Hence, their combination is expected to not only inhibit N-d-Ti 3 C 2 T x nanosheets from re-stacking, but also enhance the specific capacity of the whole electrode. Here, benefiting from the synergistic effect of the two components, the obtained optimal flexible and free-standing N-d-Ti 3 C 2 T x /MoO x film electrode delivers an ultrahigh capacity of 341.0 C g −1 (920.6 C cm −3 , 487.1 F g −1 , 1315.2 F cm −3 ) at the scan rate of 2 mV s −1 , and shows superior capacity retention of 99.2% after 11000 cycles at the current density of 5 A g −1 . Moreover, the flexible and free-standing N-d-Ti 3 C 2 T x /MoO x film electrode is also beneficial to promote the development of flexible supercapacitors.
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高影响因子
Materials Today Energy
·
2019
·
IF 0
Zhiguo Hou,Xueqian Zhang,Huaisheng Ao,Mengke Liu,Yongchun Zhu,Yitai Qian
The narrow electrochemical stability window (1.23 V) of electrolyte has hindered the development of aqueous sodium ion batteries greatly, especially the choice of electrode materials. Here, through theoretical calculation and experimental proof, it's found that the deposition of oxide films on both Al cathode and Ti anode current collectors exhibits strong passivation effect. When the thickness of Al 2 O 3 film on Al is about 3 nm and the thickness of TiO 2 film on Ti is about 5 nm, the electrochemical stability window of aqueous electrolyte can be expanded to 3.5 V. Therefore, TiS 2 with low working potential (1.5 V versus Na + /Na) can be used as anode material in aqueous sodium-ion battery for the first time. We assembled a full cell coupling TiS 2 anode with Prussian blue cathode in 15 M NaClO 4 aqueous electrolyte. The full cell of 2.6 V demonstrates cycle life up to 1000 times with high energy density (100 Wh kg −1 ) and high rate capability (30 C).
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Progress in Natural Science-Materials International
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2019
·
IF 3.31
Xinyang Jiao,Xiaoping Cai,Gao Niu,Xuanru Ren,Xueqin Kang,Peizhong Feng
Porous TiAl 3 intermetallics were synthesized from Ti-75 at.% Al elemental powder mixtures using an energy-saving and rapid reactive method of thermal explosion (TE). The results demonstrated that the actual temperature of the compact climbed rapidly from 673 °C to 1036 °C within 24 s, indicating that an obvious TE reaction occurred during sintering process. The video graphs suggested that the TE in Ti–Al system behaved instant occurrence and overall heating whether from axial or radial direction. The silver wires and NaCl particles that pressed on the surface of the sample disappeared due to the heavy heat released during TE reaction. Only pure TiAl 3 phases were synthesized in TE products and the open porosity of 55.4% was easy to obtain. After high-temperature treatment at 1000 °C, large amounts of sintering-neck formed and then improved the compressive strength of porous TiAl 3 materials. Moreover, the mass gain curve of porous TiAl 3 intermetallics oxidized at 650 °C for 120 h exhibited the parabolic oxidation rate law. XPS analysis confirmed that the strong O 1s peak was 531.4 eV which was the typical binding energy of Al 2 O 3 . Therefore, the excellent oxidation resistance of porous TiAl 3 foams would be considered as good candidate materials for prolonging the service life at high temperatures.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 46
·1905694
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IF 15.621
Lin Yang,Chunxiang Dall'Agnese,Yohan Dall'Agnese,Gang Chen,Yu Gao,Yoshitaka Sanehira,Ajay Kumar Jena,Xiao-Feng Wang,Yury Gogotsi,Tsutomu Miyasaka
MXenes are a large and rapidly expanding family of 2D materials that, owing to their unique optoelectronic properties and tunable surface termination, find a wide range of applications including energy storage and energy conversion. In this work, Ti 3 C 2 T x MXene nanosheets are applied as a novel type of electron transport layer (ETL) in low-temperature processed planar-structured perovskite solar cells (PSCs). Interestingly, simple UV-ozone treatment of the metallic Ti 3 C 2 T x that increases the surface Ti O bonds without any change in its bulk properties such as high electron mobility improves its suitability as an ETL. Improved electron transfer and suppressed recombination at the ETL/perovskite interface results in augmentation of the power conversion efficiency (PCE) from 5.00% in the case of Ti 3 C 2 T x without UV-ozone treatment to the champion PCE of 17.17%, achieved using the Ti 3 C 2 T x film after 30 min of UV-ozone treatment. As the first report on the use of pure MXene layer as an ETL in PSCs, this work shows the great potential of MXenes to be used in PSCs and displays their promise for applications in photovoltaic technology in general.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
X.Q. Liu,C.J. Li,X. You,Z.Y. Xu,X. Li,R. Bao,J.M. Tao,J.H. Yi
Carbon nanotube reinforced aluminum matrix (CNT/Al) composites with various microstructures were fabricated by powder metallurgy via introducing nano-sized and micron-sized Ti powders into the CNT-Al system. The size-dependent effects of Ti powders on the microstructure evolution and mechanical properties were further investigated. The results reveal that the best enhancement (∼51% of UTS) was obtained by adding 80 nm sized Ti powders into the CNT/Al composite compared with the composite without Ti addition, which mainly derives from the synergistic strengthening of the homogenously dispersed CNTs, a large quantity of in-situ formed nano-sized TiAl 3 particles and fine grains. Meanwhile, it is also noted that the addition of micron-sized Ti powders can help the CNT dispersion in powder fabrication stage, and subsequently in-situ formed core-shell structured particles with different interface reaction degree in the Al matrix. Among them, 1 μm was determined to be the optimal size of Ti for the maximum formation of core-shell structured particles, which best exploits the load transfer ability of TiAl 3 shell layers at their interfaces, and finally attributes to significant strength enhancement (∼35% of UTS). This research provides a valuable reference concerning the size effects of addition metal in future fabrication of CNTs reinforced metal matrix composites with alternative microstructure.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Longqing Chen,Wenbin Qiu,Hao Deng,Xiaoliang Yang,Yangyipeng Song,Jun Zhu,Jun Tang
The shrinkages presented in sintering process of tungsten alloys are extremely detrimental to their practical applications in fusion reactors. Positively in this work, we effectively reduced the shrinkages via synergistically applying Ti-doping and annealing process on tungsten‑potassium (WK) alloys. This shrinkage-fill effect only works in the one with trace amount of titanium doping, such as 0.05 wt%Ti or 0.5 wt%Ti. Due to such effect, the compressive strength was improved by ~18%. Based on morphological and elementary analyses, we speculated that the Ti-rich particles along the grain boundaries of WK alloys were activated and migrated into shrinkages during annealing. Further Ti doping (e.g. 1wt.%Ti) led to nanoscale grain refinement in WK alloys, which almost doubled the compressive strength. In this case, an unconventional grain-refinement model was proposed. Furthermore, anomalous grain growth was observed in WK-3wt.%Ti, which was attributed to the formation of Ti-rich regions and the corresponding raise of energy in grain boundaries. The fabricating strategies in this work may benefit the design of refractory tungsten alloys with less shrinkages and ultra-fine grains.
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高影响因子
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