NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 22
·8613-8619
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IF 3.069
Zizheng Ai,Bin Chang,Chengwei Xu,Baibiao Huang,Yongzhong Wu,Xiaopeng Hao,Yongliang Shao
Electrocatalysts with the advantages of stability, high efficiency, and noble-metal-free features are in urgent need for water splitting. Herein, for the first time, based on the interface engineering, a novel BNNS@Ti3C2 intercalation electrocatalyst was prepared via a controllable synthesis strategy. The rich active sites of Ti3C2 were better protected as well as were able to serve as a bridge to connect the different layers of BNNS. Furthermore, combining the first-principles calculations, the nature of the interface proved the transformation from semiconducting properties to metallicity in this unique intercalation structure. The as-obtained composite possessed improved conductivity and abundant catalytic active sites, exhibiting a low onset potential of 23 mV and overpotential of 52 mV (vs. RHE) at 10 mA cm−2 with outstanding stability. BNNS@Ti3C2 was used as an electrocatalyst for the first time without noble-metal assistance. This study demonstrates that the layered materials can serve as a promising electrocatalyst by interfacing with the intercalation structure.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 46
·1905694
·
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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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
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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Advances in Applied Ceramics
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2018
·
IF 1.092
Kuibao Zhang,Dan Yin,Xirui Lu,Haibin Zhang
In this study, the zirconolite-rich composite was rapidly synthesised from self-propagating high-temperature synthesis plus quick pressing using MoO3 as the oxidant and Ti as the reductant. As a surrogate of trivalent actinides, Nd was introduced to substitute the Ca site of zirconolite and Al was employed as the charge compensator to replace the Ti site (nominally Ca1−xNdxZrTi2−xAlxO7). The phase composition and Nd occupancy were analysed after Nd2O3 addition. Nd-bearing zirconolite was produced as the major ceramic phase. Nd mostly substitutes the Ca sites of zirconolite, which results in waste loading higher than 8.6 wt-% Nd. The aqueous durability of Nd–Al codoped sample (with 15 at.-% Nd substitutes the Ca site of zirconolite) was evaluated at 90°C as well. The 42 days normalised leaching rates of Mo, Ca and Nd were measured to be 3.70, 1.90 × 10−2 and 3.46 × 10−4 g m−2 d−1.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
X.Q. Liu,C.J. Li,J.H. Yi,K.G. Prashanth,N. Chawake,J.M. Tao,X. You,Y.C. Liu,J. Eckert
Achieving effective load transfer at the interface between carbon nanotubes (CNTs) and aluminum (Al) is a crucial issue for fabricating high-performance CNTs reinforced Al matrix (CNT/Al) composites. In this work, CNT/Al composites with different Ti additions and the compared materials were prepared by powder metallurgy . Micro-sized Ti particles in which CNTs are well-dispersed firstly circumvent the difficulty of CNT dispersion, and subsequently act as nucleation site for sandwiched TiAl 3 layers that lock the dispersed CNTs in place and improve the CNT-Al interface bonding. Additionally, Ti addition not only allows modification of the dispersed CNTs but also enhances the strength of the composites by enhancing the load-bearing capacity of the CNTs through in situ formation of nano-sized titanium carbide (TiC). This work provides a new approach to improve the load transfer efficiency of CNTs by strengthening the interface bonding for fabricating high strength CNT/Al composites.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yajing Wang,Jiankang Wang,Guokang Han,Chunyu Du,Qihuang Deng,Yunzhi Gao,Geping Yin,Ying Song
Carbon support used in commercial Pt/C commonly suffers from corrosion under harsh electrooxidation environment endowed by anodic potential. An alternative support with superior electric conductivity and stable structure should be developed. Herein, Ti 3 C 2 MXene was synthesized as support to immobilize Pt nanoparticles due to its fascinating stable layered structure, and metallic property. Used as electrocatalyst for methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) for the first time, as-prepared Pt/Ti 3 C 2 MXene showed much enhanced electrocatalytic activity for methanol oxidation, as unraveled by its peak current density of 1.137 mA/cm 2 , nearly three times larger than that of Pt/C (0.388 mA/cm 2 ). Moreover, it also exhibited long-term stability even running for 2 h. In addition, Pt/Ti 3 C 2 MXene was able to catalyze electrochemical hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 solution with only 7 mV overpotential at − 10 mA/cm 2 , obviously lower than that of Pt/C (17 mV). The improved MOR and HER activity of Pt/Ti 3 C 2 MXene could be assigned to the unique stable 2D nanosheet structure, excellent electric conductivity, strong binding strength as well as electronic effect between Pt and Ti 3 C 2 MXene. This work widens the application of Ti 3 C 2 MXene in the field of methanol oxidation and hydrogen evolution reaction.
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高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Ying Lei,Wensheng Gao,Yu Li,Rundong Wan,Wen Chen,Rui Zheng,Leiqiang Ma,Hongwei Zhou
In the present wok, a series of Ti-filled and Te-doped skutterudite compounds Ti x Co 4 Sb 11.5 Te 0.5 (x = 0.2, 0.3, 0.5) were successful fabricated by combination of microwave synthesis and spark plasma sintering technique. The microstructure and thermoelectric properties of Ti x Co 4 Sb 11.5 Te 0.5 bulks have been investigated systematically. The experimental results show that nearly single phase skutterudite were obtained by 5 min microwave synthesis. The Ti 0.3 Co 4 Sb 11.5 Te 0.5 bulk has smallest and uniform grain size of about 2 μm. The influences of Ti concentration on thermoelectric properties were discussed. A highest ZT of 0.60 for Ti 0.3 Co 4 Sb 11.5 Te 0.5 was achieved at 773 K along with a total thermal conductivity of 3.72 W m −1 K −1 , one might obtain higher values at a higher temperature.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xin Zhang,Zhuanghe Ren,Yunhao Lu,Jianhua Yao,Mingxia Gao,Yongfeng Liu,Hongge Pan
Herein, we synthesize successfully ultrafine TiN nanoparticles (<3 nm in size) embedded in N-doped carbon nanorods (nano-TiN@N–C) by a facile one-step calcination process. The prepared nano-TiN@N–C exhibits superior catalytic activity for hydrogen storage in NaAlH4. Adding 7 wt % nano-TiN@N–C induces more than 100 °C reduction in the onset dehydrogenation temperature of NaAlH4. Approximately 4.9 wt % H2 is rapidly released from the 7 wt % nano-TiN@N–C-containing NaAlH4 at 140 °C within 60 min, and the dehydrogenation product is completely hydrogenated at 100 °C within 15 min under 100 bar of hydrogen, exhibiting significantly improved desorption/absorption kinetics. No capacity loss is observed for the nano-TiN@N–C-containing sample within 25 de-/hydrogenation cycles because nano-TiN functions as an active catalyst instead of a precursor. A severe structural distortion with extended bond lengths and reduced bond strengths for Al–H bonding when the [AlH4]− group adsorbs on the TiN cluster is demonstrated for the first time by density functional theory calculations, which well-explains the reduced de-/hydrogenation temperatures of the nano-TiN@N–C-containing NaAlH4. These findings provide new insights into designing and synthesizing high-performance catalysts for hydrogen storage in complex hydrides.
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PubMed
高影响因子
ANALYST
·
2018
·Vol. 143
·期 20
·5030-5037
·
IF 3.864
Qiong Wu,Fengxia Zhang,Huijuan Li,Zhihua Li,Qi Kang,Dazhong Shen
Herein, we report a ratiometric photoelectrochemical (PEC) immunosensor coupled with secondary antibodies–Co3O4 nanoparticle conjugates (Ab2–Co3O4 NPs) for signal amplification. The Ab1-g-C3N4@TiO2 NTs and BSA-g-C3N4@TiO2 NTs act as the sensing and reference photoelectrodes, where Ab1, BSA and TiO2 NTs are the capture antibodies, bovine serum albumin and TiO2 nanotube arrays, respectively. In the presence of target Ag, the sensing PEC photocurrent decreases due to the steric hindrance of Ab1 molecules, which increases the inner resistance of the photoelectrode. The signal-off response is enhanced further using Ab2–Co3O4 NP conjugates due to their steric hindrance effect and the consumption of electron donors by the Co3O4 NPs. Furthermore, the performance of the ratiometric PEC platform is tested using alpha-fetoprotein (AFP) as a model antigen. Under the optimal conditions, the concentration of AFP is detected in the range of 0.4 pg mL−1 to 40 ng mL−1 with a detection limit of 0.2 pg mL−1. This ratiometric strategy is beneficial to improve the reliability and anti-interference ability of PEC immunosensors.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 33
·16196-16204
·
IF 9.931
Jianqiu Zhao,Yawei Yang,Chenhui Yang,Yapeng Tian,Yan Han,Jie Liu,Xingtian Yin,Wenxiu Que
Solar steam generation is a renewable, environmentally friendly and low-cost technology for seawater desalination and wastewater remediation. Highly efficient solar evaporation from pure water has been achieved using advanced artificial architectures and hydrophilic light absorption materials, while the long-term steady work for high salinity water desalination becomes a non-negligible problem when it comes to practical use. In terms of this issue, a hydrophobic MXene membrane, which contains a salt-blocking delaminated Ti3C2 nanosheet layer with trimethoxy(1H,1H,2H,2H-perfluorodecyl)silane modification for sunlight harvesting and a piece of commercial filter membrane for water supply, is proposed in this work. With high light utilization, high stability, abundant evaporating channels, rapid water transport through the filter membrane and salt-blocking on the MXene membrane, the as-fabricated self-floatable device achieves a solar evaporation rate of 1.31 kg m−2 h−1 and a solar steam conversion efficiency of 71%, and stability under high salinity conditions under one sun over 200 hours, ensuring the highly efficient and long-term stable photothermal transduction for water purification from seawater and wastewater containing organic dyes and heavy metals. The hydrophobic surface enabled salt-blocking MXene membrane is proved to be an effective, efficient and stable photothermal material for solar desalination.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Jiali Xue,Kuibao Zhang,Zongsheng He,Wenwen Zhao,Weiwei Li,Dayan Xie,Haibin Zhang
Simulated radioactive soil waste has been immobilized rapidly by self-propagating high-temperature synthesis (SHS) using CuO as the oxidant. CeO 2 was incorporated into the soil waste as the surrogate of radioactive actinide nuclides. The phase composition, microstructure, elemental distribution, density and chemical durability of obtained waste forms have been characterized. These results show that the radioactive soil waste forms were successfully prepared with zirconolite (2M-CaZrTi 2 O 7 ), soil (SiO 2 ) and Cu as the main phases. Simulated nuclide Ce was successfully immobilized in the solidified zirconolite-rich ceramic body. Moreover, the radioactive soil waste solidified body exhibits excellent chemical durability. The normalized leaching rates (42 d) of Si and Ca are in low values of 4.1 × 10 −3 and 2.5 × 10 −3 g m −2 d −1 , while that of Ce is kept as 10 −4 − 10 −6 g m −2 d −1 within 42 days. This result indicates a potential application of SHS for the safety disposal of radioactive contaminated soil waste.
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危险品化学品经营许可证（带存储）