SOLAR ENERGY
·
2019
·
IF 4.674
Han Song,Zhenxiao Pan,Huashang Rao,Xinhua Zhong
The time-consuming transport of photo-generated electrons across conventional photoanode film, composed of disordered P25 TiO 2 nanoparticulates, is one of the main bottlenecks to improve the performance of quantum dot-sensitized solar cells (QDSCs). A convenient and effective method was developed for the preparation of high performance photoanodes based on composite paste composed of conventional P25 TiO 2 nanoparticulates and TiO 2 hierarchical nanowires (HNW) for QDSCs. The shortened transport path in the composite photoanode brings forward suppressed charge recombination processes at the interfaces between photoanode and electrolyte, and improved photovoltaic performance of the resulting solar cells. Through optimizing the composite photoanode and the adoption of N-doped mesoporous carbon/Ti counter electrodes, average power conversion efficiency of Zn-Cu-In-Se (ZCISe) QDSCs was increased from 12.77% corresponding to conventional P25 photoanodes to 13.43% ( J sc = 27.38 mA cm −2 , V oc = 0.764 V, and FF = 0.642) corresponding to photoanodes with HNW/P25 weight ratio of 0.1%. Furthermore, this composite photoanode is also effective in improving the photovoltaic performance of QDSCs under different QD sensitizers (such as Zn-Cu-In-S (ZCIS) QDs) as well as different counter electrodes (such as Cu 2 S/brass).
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DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 16
·5932-5941
·
IF 8.262
Yu Zhou,Yong Liu,Wenxia Zhao,Fangyan Xie,Ruimei Xu,Baojun Li,Xiang Zhou,Hui Shen
A promising new concept is to apply additive/binder-free electrodes for lithium-ion batteries by directly growing active materials on current collectors, however, they still suffer from the low quality electronic contact and poor mechanical stability due to the lattice mismatch between active materials and substrates. Here we present the direct growth of vertically aligned MoS2 nanosheets on a Ti substrate through a self-supported TiO2 bonding interface route, thereby preferentially exposing the edges on the film surface. In this unique structure, MoS2 nanosheets are interconnected with each other and create a strong adhesion to the Ti substrate through the TiO2 bonding interface, which would allow electrons to easily transport throughout the whole electrode. Furthermore, their edge-terminated structure can provide more sites for Li-ion intercalation. By using this additive/binder-free electrode, it can deliver a discharge capacity as high as 1189 mA h g−1 at a current density of 1000 mA g−1 after 600 cycles. Importantly, our synthetic approach, based on this metal surface dissolution–crystallization produced bonding interface, can provide a general strategy for the direct growth of other metal sulphides such as NiS and CoS nanosheets on the Ti substrate with great promise for various applications.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yong Huang,Wendong Wang,Xuejiao Zhang,Xiaoting Liu,Zhiwei Xu,Shuguang Han,Zhuobin Su,Huiying Liu,Yuan Gao,Hejie Yang
Orthopedic implants need to be coated with biomedical coatings that can facilitate osseointegration and mitigate bacterial biofilm formation. Using anodisation and electrodeposition techniques, we modified Ti implants with a double-layer coating made of TiO 2 nanotubes (TNT) and hydroxyapatite that was codoped with silver and manganese (AgMnHA). The silver incorporation into hydroxyapatite improves its antimicrobial properties, and the manganese doping offsets the potential cytotoxicity of the incorporated silver. The AgMnHA and the TNT films were characterized with X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The results highlight that the manganese and silver ions were evenly incorporated into the AgMnHA/TiO 2 coating. Its adhesion strength significantly increased because of the interlocking of the rough TiO 2 layer with the bioceramic particles that entered into the voids of the TiO 2 nanotubes. The coating decreases the corrosion current density of titanium from 3.71 μA to 0.19 μA, and increases its corrosion resistance by almost two orders of magnitude. The coating can continuously release silver ions into the bacterial suspension, resulting in excellent antimicrobial efficacy with a 100% reduction in viable cells. Both hydroxyapatite and the AgMnHA/TiO 2 coating are super-hydrophilic; meanwhile, if immersed in a simulated body fluid, they could induce the deposition of typical spherical apatite . In-vitro cell culture tests demonstrated that hydroxyapatite and the AgMnHA/TiO 2 coating considerably improved the cell viability and the alkaline phosphatase (ALP) activity. Therefore, the AgMnHA coating has no significant cytotoxicity on osteoblasts, and could generate sufficient osteoblast differentiation for osseointegration. We therefore find that a bilayer AgMnHA/TiO 2 coating on Ti implants improves antibiofilm properties that does not offset the hydroxyapatite biocompatibility that is needed for successful osseointegration and bone healing.
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高影响因子
Nanoscale
·
2019
·Vol. 11
·期 18
·8967-8977
·
IF 6.97
Li Li,Rui Zhao,Tinghua Xu,Dandan Wang,Du Pan,Kun Zhang,Caiyan Yu,Xia Lu,Guanjie He,Ying Bai
LiNi0.5Mn1.5O4 (LNMO) spinel has drawn increasing attention due to its high voltage, stabilized electrochemical performance and safety features as a cathode for lithium-ion batteries. However, the main challenge lies in its unstable surface structure, especially at elevated temperatures. In this paper, we decorate the LNMO precursor with a solid electrolyte of Li1.4Al0.4Ti1.6(PO4)3 (LATP) via a facile sol–gel method, followed by a co-crystallization process at 820 °C, to successfully generate a LATP modification shell at the surface of LNMO. The LATP modification shell could not only optimize the morphology of LNMO including the limitation of particle growth and control of crystalline orientation, but also realize ion doping during the co-crystallization process. By tuning the LATP contents, the 2 wt% LATP modification is found to be the most effective at balancing the interfacial stability and Li+ diffusion kinetics of LNMO, as well as enhancing its rate capability and capacity retention at high temperatures. As a result, the 2 wt% LATP-modified LNMO cathode exhibits a high reversible capacity of 84.8 mA h g−1 after 500 cycles with a capacity retention of 68.9%, and a superior rate capability (102.0 mA h g−1 at 20 C) at room temperature. Moreover, this electrode also delivers a good capacity retention of 85.7% after 100 cycles at 55 °C, which is ascribed to the stabilized interface with a LATP protective layer.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Zhen Wang,Xinbo Ci,Hongjun Dai,Lu Yin,Huixiang Shi
A highly photoactive Ti-containing Cr-modified MCM-48 photocatalyst (Si/Ti = 3.4, Si/Cr = 50) was prepared by a facile one-step method at room temperature. A combination of various physicochemical techniques such as X-ray diffraction (XRD), N 2 physisorption, diffuse reflectance UV–vis spectra (DRS) and X-ray photoelectron spectra (XPS) were used to characterize the properties of the synthetic catalysts. The characterization and experimental results indicated that tetrahedral Ti oxide moieties as dominant Ti oxide were loaded into the mesoporous structure and there was a synergistic interaction between the Ti species anchored on the walls and the Cr ions presented in the MCM-48 framework, which was considered to be directly correlated to the photoactivity. The Ti-Cr-MCM-48 sample can remove H 2 S with the efficiency of 92% under visible light, being the Cr 6+ species primarily responsible for this photoactivity. A deactivation was observed as a consequence of sulfate accumulation on the surface of the catalyst and reduction of Cr 6+ .
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhu Gao,Jiaxing Wang,Yaseen Muhammad,Peng Hu,Yang Hu,Zhe Chu,Zhongxing Zhao,Zhenxia Zhao
Competitive adsorption of volatile organic compounds (VOCs) under high humidity is a critical but challenging issue in the applications of metal–organic frameworks (MOFs). In this work, hydrophobic-shell structured NH 2 -MIL(Ti)-125@mesoporous carbon composite was designed to enhance selective adsorption towards VOCs under humid conditions via confined growth strategy. Ti-clusters were first anchored into pores of ordered mesoporous carbon (OMC), and then confined grown into NH 2 -MIL(Ti)-125 via ‘ship-in-the-bottle’ approach. Hydrophobic shell of OMC concurrently protected the adsorption sites on NH 2 -MIL(Ti)-125 from H 2 O occupation and enhanced affinity towards non-polar toluene. Moreover, the resulting composited supplied abundant diffusion channels for toluene thereby accelerated the mass transfer though mesopores (OMC) and micropores (MOFs). As expected, the hydrophobic-shell NH 2 -MIL(Ti)-125@OMC composite efficiently enhanced hydrophobic property and toluene adsorption affinity. It obtained a dramatical increase in toluene adsorption capacity (3.86 mmol/g at 0.001 P / P 0 ) about 7.4 times of NH 2 -MIL(Ti)-125, and a 29% decrease in water vapor adsorption capacity (0.30 g/g at 1 mbar), which much superior than many reported expensive adsorbents. In addition, the composite induced more confined micropores to mesopores interconnected structure in MIL(Ti)@OMC Ti , and hence facilitated toluene diffusion. The toluene rate constant of pseudo-second-order adsorption ( k a ) on the MIL(Ti)@OMC Ti was up to 0.12 g/(mmol∙min), which was 1.2–2.0 times higher than those of the MIL(Ti) species. Moreover, breakthrough curve indicated that MIL(Ti)@OMC Ti showed 1.5 times of toluene working capacity with faster diffusivity at 80% RH compared to pure NH 2 -MIL(Ti)-125, while the latter exhibited much lower value of Q w / Q e than that of the former. This work provides a novel composite strategy for hydrophobic MOFs construction, and deeper understanding for VOCs/H 2 O competitive adsorption on MOFs composites in large scale applications.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 38
·20195-20201
·
IF 8.867
Jiuwang Gu,Qitong Huang,Yufei Yuan,Kai-Hang Ye,Zilong Wang,Wenjie Mai
Unfavorable interfacial electron back-injection, sluggish surface kinetics, and poor bulk conductivity leading to remarkable recombination are the key issues which significantly hinder the solar-to-hydrogen efficiency of PEC photoanodes. In this study, Ti foil is employed as the substrate for fabricating BiVO4 photoanodes. Surface passivation of TiO2 is sophisticatedly designed to block interface recombination in solar water splitting for the first time, so that a significant two-fold increase in photocurrent and a large decrease in dark current are observed. In addition, to address the other two issues, CoOx oxygen evolution catalysts (OECs) and Mo/N doping are applied to increase the photocurrent density and applied bias photon-to-current efficiency to 5.04 mA cm−2 at 1.23 VRHE and 1.41% at 0.75 VRHE, respectively, under AM 1.5 G illumination, which suggests the great potential of integrating strategies to target specific issues in BiVO4 photoanodes.
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高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Fan Peng,Youqi Chu,Yu Li,Qichang Pan,Guangchang Yang,Lixuan Zhang,Sijiang Hu,Fenghua Zheng,Hongqiang Wang,Qingyu Li
The Nickel-rich layered cathode materials charged to 4.5 V can obtain a specific capacity of more than 200 mAh g −1 . However, the nickel-rich layered cathode materials suffer from the severe capacity fade during high-voltage cycling, which is related to the phase transformation and the surface sides reactions caused by the lattice oxygen evolution. Here, the simultaneous construction of a Mg, Ti-based surface integrated layer and bulk doping through Mg, Ti surface treatment could suppress the lattice oxygen evolution of Ni-rich material at deep charging. More importantly, Mg and Ti are co-doped into the particles surface to form an Mg 2 TiO 4 and Mg 0.5– x Ti 2– y (PO 4 ) 3 outer layer with Mg and Ti vacancies. In the constructed surface integrated layer, the reverse electric field in the Mg 2 TiO 4 effectively suppressed the outward migration of the lattice oxygen anions, while Mg 0.5– x Ti 2– y (PO 4 ) 3 outer layer with high electronic conductivity and good lithium ion conductor could effectively maintained the stability of the reaction interface during high-voltage cycling. Meanwhile, bulk Mg and Ti co-doping can mitigate the migration of Ni ions in the bulk to keep the stability of transition metal–oxygen (M−O) bond at deep charging. As a result, the NCM@MTP cathode shows excellent long cycle stability at high-voltage charging, which keep high capacity retention of 89.3% and 84.3% at 1C after 200 and 100 cycles under room and elevated temperature of 25 and 55 °C, respectively. This work provides new insights for manipulating the surface chemistry of electrode materials to suppress the lattice oxygen evolution at high charging voltage.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Qiuyang Zhang,Ruirui Ma,Kunpeng Jia,Xuan Zhu,Shunhang Dong,Jing Sun,Jie Chen,Hao Feng
Given the clinical challenge of implant-associated infections, the development of stimuli-responsive antibacterial surfaces is of great significance for the repair of infected bone defects. In this study, a multifunctional coating of TNT + PMAA with pH-responsive antibacterial and pro-osteogenic activities was designed and fabricated on the surface of orthopedic titanium implants. TiO 2 nanotubes (TNT), as nanocarriers, were first prepared via electrochemical anodization. Subsequently, Zn 2+ ions and naringin were loaded via hydrothermal treatment and spin-coating, respectively. Poly(methacrylic acid) (PMAA), acting as a molecular “gatekeeper”, was further grafted onto the surface via a carbodiimide reaction with pre-deposited polydopamine layers. The as-prepared coatings were systematically characterized in terms of their morphology, chemical composition, surface wettability, Zn 2+ and naringin release behaviors, antibacterial activity, and cytocompatibility. The TNT + PMAA coatings maintained the porous nanotubular structure of the original nanotubes, but the inner diameter was significantly reduced and the roughness increased. Owing to the introduction of abundant hydrophilic groups, the surface wettability was greatly enhanced. The TNT + PMAA coatings intelligently released Zn 2+ ions and naringin to significantly inhibit S . aureus and E . coli . Such release was notably triggered by acidification of the surrounding microenvironment, thus realizing on-demand release. The TNT + PMAA coatings displayed excellent cytocompatibility, which enhanced osteoblast adhesion and proliferation, up-regulated the function expressions of alkaline phosphatase (ALP), osteocalcin (OCN), and runt-related transcription factor-2 (RUNX2), and significantly accelerated the formation of bone-like apatite crystals. This work offers a novel approach for designing osteogenic and antibacterial surfaces for infected bone regeneration and repair, using natural components with low cytotoxicity.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Yuanqiong Mu,Tong Wang,Mei Zhang,Min Guo
Lithium silicate (Li 4 SiO 4 ), an efficient CO 2 high-temperature sorbent , has become the research hotspot in CO 2 capture due to its large theoretical adsorption capacity and fast rate. How to further reduce production cost while ensuring the adsorption performance has become the key to industrial application. In this work, using Al, Fe, Ti co-doped SiO 2 aerogel synthesized from fly ash as silicon source, Li 4 SiO 4 sorbents were achieved through solid-state calcination method. The influences of preparing conditions on the microstructure and CO 2 capture property were systematically investigated. Under the optimum conditions, the as-prepared Li 4 SiO 4 demonstrated the best CO 2 adsorption capacity of 33.24 wt% within 7.0 min. Particularly, the CO 2 capture capacity remained 23.38 wt% (>70% of the first value) after 35 cycles, indicative of long cycle stability. Moreover, the kinetic characteristics of CO 2 adsorption process could be well simulated by the double exponential model, and the diffusion process of Li + /O 2− ions was the decisive step of the whole adsorption reaction. Compared with Li 4 SiO 4 by pure reagents, the sorbent from fly ash-based aerogel exhibited competitive adsorption capacity, which provides a new cost-effective way to synthesize CO 2 high-temperature sorbent with super capture performance and good cycle stability.
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Boyuan Tu,Kaifu Yu,Dengjiang Fu,Li Zhou,Ruixiang Wang,Xinying Jiang,Huanhuan Liu,Xin Cao,Xiang Gong,Rong He,Yongjian Tang,Tao Chen,Wenkun Zhu
Photo-assist uranium extraction from fluorine-containing uranium wastewater by building semiconductor-plasma material heterostructure is a forward-looking strategy, which not only effectively accelerates F-U separation via the LSPR effect but also impacts the intensity of binding between U (VI) and site. Here, we developed an amino-rich Ag-NWs/NH 2 -MIL-125(Ti) (AgNW/N-M(Ti)) hybrid nanowires with LSPR effect for photo-assist uranium extraction. Accordingly, the AgNW/N-M(Ti) hybrid nanowires presented 90.4% removal efficiency for U(VI) without a sacrificial agent at the U: F molar ratio of 1:20. By virtue of In-situ KPFM, we identify hot electrons generated over AgNW were transferred to amino-rich N-M(Ti) to efficiently reduce the U(VI) adsorbed on the N-M(Ti), which effectively enhances the excellent uranium removal performance of AgNW/N-M(Ti) hybrid nanowires. This strategy may open a paradigm for the development of advanced heterojunctions with the LSPR effect as catalysts for photo-assisted uranium extraction from fluorine-containing uranium wastewater.
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DOI
高影响因子
Journal of Natural Gas Chemistry
·
2012
·
IF 1.348
Lincai Peng,Junping Zhuang,Lu Lin
Effects of Zr/Ti molar ratio in SO 2− 4 /ZrO 2 -TiO 2 solid acid catalyst calcined at different temperatures on its surface properties and catalytic activity were thoroughly investigated in this paper. The physicochemical characteristics of prepared samples were determined by N2 adsorptiondesorption, XRD, NH3-TPD and XPS techniques, respectively. It was found that the crystallization temperature of the samples increased after the combination of ZrO 2 and TiO 2 ; and phase transformations from the anatase to the rutile of TiO 2 species and the tetragonal to the monoclinic of ZrO 2 species were effectively suppressed at higher temperature. The sample with a Zr/Ti molar ratio of 3/1 calcined at 450 °C showed the highest surface area and the most acid sites among all the tested samples. The acid site densities of samples were relatively closed to each other if they were calcined at the same temperature, however, decreased with the calcination temperature. The result indicates that the sulfur content in samples is a crucial factor to control the acid site density. Calcining the sample at 650 °C and higher temperatures resulted in a significant desorption of sulfate ion on the samples. The synthesized samples were evaluated as a potential catalyst for glucose conversion under the near-critical methanol conditions (200 °C/4 MPa). The results suggested that the relatively weaker acid sites of the catalyst were more favorable for the accumulation of methyl glucosides, while the moderate acid sites were responsible for the formation of methyl levulinate. The catalytic activity for methyl levulinate production almost increases linearly with the catalyst acid site density. The catalyst deactivation is due to the loss of sulfate ion and the two catalysts with Zr/Ti molar ratios of 3/1 and 1/3 could effectively alleviate the deactivation caused by sulfate solution in the reaction medium and can be reused after calcination with the reuse rate of over 90% in terms of the methyl levulinate selectivity.
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产品关联
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高影响因子
危险品化学品经营许可证（带存储）