ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Liu Gao,Fujie Li,Guangrong Zeng,Xin Jin,Zhenyou Li,Chao Wang
Elevating the charging cut-off voltage is an effective strategy to increase the energy density of LiCoO 2 . However, unstable interfacial structures and unfavorable phase transitions in bulk are inevitably triggered during deep de-lithiation at high voltage. Herein, an integrated surface-to-bulk Ti-modification strategy is applied to LiCoO 2 , enabling uniform Li 2 TiO 3 coating on the surface and gradient Ti-doping toward the structural bulk. The resultant Ti-modified LiCoO 2 (T-LCO) electrode can be stably cycled up to 4.6 V, providing a high-rate capability of 137 mAh g −1 at 5C and a long-life stability with 80.5% capacity retention after 400 cycles at 1C, far outperforming the unmodified LiCoO 2 electrode with only 50.7% capacity retention. In situ X-ray diffraction characterization and density functional theory calculation reveal that the synergistic modification of T-LCO enhances Li + diffusion, facilitates the construction of high-quality cathode/electrolyte interphase, reduces the phase transition from O3 to H1-3 and Co3d/O2p band overlap, and restrains layer-to-spinel phase distortion, thus improving structural stability at 4.6 V. This work presents a “two birds one step” strategy to enhance the cycling stability and achievable capacity of high-voltage LiCoO 2 for developing high energy density lithium-ion batteries.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Kai Huang,Xulin Mu,Yang Ding,Jinhui Li,Manling Sui,Pengfei Yan
Polycrystalline Ni-rich layered lithium transition metal oxides are one of the most promising cathode materials for next-generation high energy density lithium-ion batteries, yet they are still facing many challenges, especially for the cycling induced structural degradations. Intergranular cracking has been identified as one of the most crucial degradations, and grain boundary (GB) engineering has been demonstrated to be an effective countering strategy. Herein, we report a GB modification protocol that can realize not only improved GB stability but also interfacial reaction kinetics, realizing much improved cycling performance of NCM811. The simple and effective solution method can incorporate Ti-dopant into GBs and secondary particle surface, realizing the increase of the capacity retention from 79.5% to 93.5% at 3.0–4.5 V after 100 cycles, and its high voltage (4.7 V) and high temperature (55 °C) cycling stability are also significantly improved. Comprehensive microstructure and electrochemical characterizations of the samples before and after cycling are conducted to reveal the underlying mechanisms, validating that both interfacial degradations and bulk failures have been effectively mitigated. This work provides an effective protocol in the modification of GBs and interfaces of polycrystalline battery materials, which is promising and feasible for industrial mass-production application.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 14
·9354-9363
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IF 12.732
Zheng Si,Baozhao Shi,Jin Huang,Ye Yu,You Han,Jinli Zhang,Wei Li
Nickel-rich layered oxides (LiNixCoyMn1−x−yO2) (x ≥ 0.8, NCM) are intensively developed cathode materials for lithium-ion batteries owing to their high energy and low price, however, their application is impeded by poor cycle stability. Herein we explored a Ti and F co-doped Li(Ni0.8Co0.1Mn0.1)O2 cathode through a solid phase reaction using the precursors of TiO2 and NH4F. Combining the characterization results of XRD, Ar sputtering assisted XPS, HRTEM, in situ XRD, etc, it is illustrated that Ti4+ and F− co-modification can synergistically modulate the lattice parameter and the Ni2+/Li+ mixing degree for the Li(Ni0.8Co0.1Mn0.1)O2 cathode material. Particularly, density functional theory (DFT) calculations demonstrate that Ti and F co-doping is beneficial to form stable crystal structures with a layered phase and rock-salt phase. Ti4+ and F− co-dopants induce the formation of an ultra-thin rock-salt phase on the cathode surface, which provides a protective layer on the nickel-rich cathode surface, so as to enhance the electrochemical performance. The optimal Ti4+ and F− co-doped sample 0.5Ti@0.5F-NCM shows a superior discharge capacity of 202.2 mA h g−1 at 1C and 45 °C, and a capacity retention of 88.1% after 200 cycles, much higher than the retention of 45.2% for NCM. For 0.5Ti@0.5F-NCM, the lithium-ion diffusion coefficients after the 1st and 100th cycles are 2.67 × 10−11 cm2 s−1 and 7.14 × 10−12 cm2 s−1 respectively, larger than those of the pristine NCM (1.37 × 10−11 cm2 s−1 and 4.52 × 10−12 cm2 s−1). The Ti4+ and F− co-doping can suppress the H2–H3 phase change of the cathode during the charge and discharge process and reduce the charge transfer resistance. The results provide a simple and feasible design strategy via cation@anion dopants to boost the electrochemical performance of nickel-rich cathodes for lithium-ion batteries.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2021
·Vol. 104
·期 11
·6054-6063
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IF 3.784
Xing Zhang,Cheng Liu,Liang Shi,Wenhao Xu,Hongyang Zhang,Rui Zeng,Huaiwu Zhang
Ti 4+ -modified MgZrNb 2 O 8 (MgZr 1- x Ti x Nb 2 O 8 , x = 0, 0.1, 0.2, 0.3, 0.4) ceramics were synthesized using the traditional solid-state reaction method. Pure MgZr 1– x Ti x Nb 2 O 8 was detected without any secondary phase via the X-ray diffraction patterns. According to the sintering behavior and the surface morphology results, the introduction of Ti 4+ reduced the sintering temperature and promoted the grain growth. The correlations between the dielectric properties and the crystal structure were analyzed through the Rietveld refinement and Raman spectroscopy. The slight shifts of the Raman peaks, corresponding to different vibration modes, were induced by the substitution of Ti 4+ for Zr 4+ and related to the improved quality factor. In general, the sample of MgZr 0.9 Ti 0.1 Nb 2 O 8 sintered at 1320°C for 4 h exhibited promising microwave dielectric properties with an ultra-high Q × f value of 130 123 GHz (at 7.308 GHz, 20°C), which is potential for 5G communication applications.
研究领域:
材料科学
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物理学
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DOI
高影响因子
ELECTROPHORESIS
·
2020
·Vol. 42
·期 4
·465-472
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IF 3.081
Qiuyue Xu,Beibei Chen,Man He,Bin Hu
Ti (IV)-modified vinyl phosphate magnetic nanoparticles (Fe 3 O 4 @SiO 2 @KH570-PO 4 -Ti (IV)) was prepared for simultaneous extraction of multiple arsenic species, followed by high performance liquid chromatography (HPLC)– inductively coupled plasma mass spectrometry (ICP-MS) analysis. Inorganic arsenic (iAs), dimethyl arsenic acid (DMA), monomethyl arsenic acid (MMA), p -amino phenyl arsenic acid ( p -ASA), 4-hdroxyphenylarsenic acid (4-OH), phenyl arsenic acid (PAA), and 3-nitro-4-hydroxyphenylarsenic acid (ROX) were investigated as interest analytes. It was found that they were quantitatively adsorbed on Fe 3 O 4 @SiO 2 @KH570-PO 4 -Ti (IV) at pH 5, and desorbed completely with 0.1 mol/L sodium hydroxide solution. Enrichment factor of 100-fold was obtained by consuming 100 mL sample solution. Under the optimal conditions, the method combining MSPE with HPLC-ICP-MS presented a linear range of 1–5000 ng/L for seven arsenic species. The limits of detection were 0.39, 0.60, 0.23, 1.85, 0.54, 0.48, and 0.84 ng/L for DMA, MMA, p -ASA, iAs, 4-OH, PAA, ROX, with the relative standard deviations ( c = 10 ng/L, n = 7) of 3.6, 3.9, 5.5, 12.4, 6.1, 5.8, 5.0, respectively. The accuracy of the method was validated by analyzing BCR 627 Tuna fish. The application potential of the method was further evaluated by chicken muscle and liver samples. No target arsenic species were detected in these samples, and good recoveries (80.6–123%) were obtained for the spiked samples at low, medium, and high concentration levels.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Xiao-Shui Li,Ya-Ni Pan,Yong Zhao,Bi-Feng Yuan,Lin Guo,Yu-Qi Feng
As one of the most important post-translational modifications, reversible phosphorylation of protein plays crucial roles in a large number of biological processes. Moreover, endogenous phosphopeptides are also associated with certain human diseases. An efficient enrichment and separation method is the premise for successful identification and quantification of phosphopeptides. In this work, titanium grafted magnetic mesoporous silica (Fe 3 O 4 @Ti-mSiO 2 ) was developed and applied for the enrichment of endogenous phosphopeptides. Fe 3 O 4 @Ti-mSiO 2 particles were prepared by grafting titanocene dichloride on the inner walls of magnetic mesoporous silica and then being calcined to remove cyclopentadienyl ligand. The physicochemical properties of the prepared materials were characterized by energy dispersive X-ray spectroscopy (EDX), nitrogen adsorption–desorption analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). For selective enrichment of phosphopeptides, the prepared Fe 3 O 4 @Ti-mSiO 2 particles were applied for tryptic digests of β -casein, mixtures of β -casein and bovine serum albumin (BSA), and low-fat milk. Finally, Fe 3 O 4 @Ti-mSiO 2 was successfully applied for the enrichment of endogenous phosphopeptides from human serum.
研究领域:
生物化学
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分析化学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Yuan-Hang Qin,Zi-Yao Xiong,Jiayu Ma,Li Yang,Zaikun Wu,Weiliang Feng,Tie-Lin Wang,Wei-Guo Wang,Cun-Wen Wang
TiO 2 -modified nitrogen-doped carbon (TiO 2 -NC), prepared by a polymerization-pyrolysis process, is used to support the Pd catalyst for ethanol oxidation reaction (EOR) in alkaline media . X-ray photoelectron spectroscopy characterization indicates that the incorporation of TiO 2 and nitrogen into the carbon matrix could improve the percentage of Pd 0 in Pd/TiO 2 -NC catalyst. Electrochemical characterization shows that the Pd/TiO 2 -NC catalyst presents higher electrocatalytic activity and stability for EOR than the nitrogen-doped carbon-supported Pd (Pd/NC) catalyst and the carbon black-supported Pd (Pd/CB) catalyst, which can be mainly attributed to the high percentage of Pd 0 in Pd/TiO 2 -NC catalyst (65%) than those in Pd/NC (48%) and Pd/CB (31%) catalysts. The results indicate that the Pd/TiO 2 -NC catalyst holds great potential as high-performance anode catalyst for direct ethanol fuel cells.
研究领域:
材料科学
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电化学
·
燃料电池
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Mengyao Ouyang,Jian Wang,Bo Peng,Yujun Zhao,Shengping Wang,Xinbin Ma
A highly efficient Ag catalyst supported on a novel Ti-decorated spherical fibrous silica (Ag/Ti-KCC-1) was synthesized via a facile approach. Characterization of catalysts, including FT-IR, N 2 physisorption, TEM, ICP-OES and DRUV–vis was carried out to investigate the physicochemical properties of the catalyst, XPS, H 2 -TPR, H 2 -TPD and DMO-TGA were conducted to further elucidate the effect of Ti dopant. It is shown that the Ti additive is able to, (1) inhibit the aggregation of Ag; (2) induce electron transfer from Ti to Ag, which effect the Ag dispersion and the adsorption ability of the reactants on the catalyst surface. Proper amount of Ti additive provided a balanced coverage of both hydrogen and dimethyl oxalate (DMO) on catalyst surface, which is essential in promoting the performance of the catalyst in the hydrogenation of DMO. By using the novel 10Ag/0.02Ti-KCC-1 catalyst, a high MG yield of 93.0% under extremely high WHSV of 1.75 h −1 is achieved.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Zhengyang Sun,Fei Xu,Shanguang Xu,Xin Han,Shanguo Du,Jie Zhang
The selective hydrogenation of furfural (FAL) to furfuryl alcohol (FOL), catalyzed by the industrially important Cu/Al 2 O 3 catalysts, represents a significant research focus in biomass valorization. In this work, the significant promoting role of Ti modification on the performance of Cu/Al 2 O 3 for this reaction was systematically investigated using a series of Cu-xTi/Al 2 O 3 (x = 1–15 wt%) catalysts. The results revealed that at low Ti loadings (<9 wt%), Ti species were highly dispersed, formed Ti–O–Al interfacial structures with the Al 2 O 3 support, effectively increasing the number of weak acid sites and oxygen vacancies. Importantly, Ti modification optimized the metal-support interaction, enhanced the electron density of Cu species through electron transfer, significantly improved the reducibility of Cu species, and promoted the formation of metallic Cu 0 . However, excessive Ti loading (>9 wt%) led to the formation of crystalline TiO 2 particles that blocked surface active sites. The Cu-9Ti/Al 2 O 3 catalyst exhibited the best performance, achieving 100 % furfural conversion and 100 % furfuryl alcohol selectivity under reaction conditions of 85 °C, 1.0 MPa H 2 , and 4.5 h in isopropanol solvent. In situ DRIFTS experiments confirmed that the reaction followed the pathway of selective carbonyl adsorption and hydrogenation, and the formed furfuryl alcohol underwent rapid desorption, avoiding over-hydrogenation. This work elucidates the dual role of Ti modification in enhancing catalytic performance by tuning support acidity and optimizing the Cu electronic structure, providing insights for designing high-performance non-noble metal hydrogenation catalysts.
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DOI
高影响因子
RENEWABLE ENERGY
·
2020
·
IF 6.274
Feng Guo,Hongtao Zou,Qilu Yao,Bin Huang,Zhang-Hui Lu
Selective catalytic decomposition of hydrazine (N 2 H 4 ) to provide a clean energy carrier hydrogen (H 2 ) is a promising alternative to fossil fuels for the future energy economy. NiPt nanoparticles (NPs) dispersed on delamination of TiO 2 -decorated Ti 3 C 2 T x (denoted as DT-Ti 3 C 2 T x ) nanosheets are prepared via a simple wet chemical reduction method and applied as an efficient catalyst for dehydrogenation of N 2 H 4 in aqueous solution. The rich oxygen-containing functional groups on the surface of DT-Ti 3 C 2 T x not only facilitate the formation and immobilization of monodisperse NiPt NPs but also enhance the synergistic effect between metal NPs and MXene support. Among all of the tested samples, the optimized Ni 0.8 Pt 0.2 /DT-Ti 3 C 2 T x nanocatalyst exhibits the 100% H 2 selectivity and best catalytic performance with a TOF value of 1220 h −1 for the selective decomposition of N 2 H 4 at 323 K. In addition, this catalyst also shows excellent catalytic performance for hydrogen production from hydrazine borane (N 2 H 4 BH 3 ) via the hydrolysis of borane group and selective decomposition of hydrazine moiety. The TiO 2 -decorated Ti 3 C 2 T x MXene can be applied as an excellent support to obtain well-dispersed and ultrafine metal NPs for various applications.
研究领域:
材料科学
·
催化
·
能源存储与转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Jianlin Li,Tingting Cai,Wei Li,Weiwei Li,Laicui Song,Qianjin Li,Guangping Lv,Jialong Sun,Saisai Jiao,Siwei Wang,Yu Jin,Tiesong Zheng
A new protein microarray method for multiplex mycotoxin detection in parallel has been established on a stable TiO2-modified porous silicon (PSi) surface. A typical competitive immunoassay microarray protocol has been developed for simultaneous detection of multiplex mycotoxins including aflatoxin B1 (AFB1), ochratoxin A (OTA), and fumonisin B1 (FB1) on the TiO2-PSi surface. The epoxy groups were selected to modify the surface of a TiO2-PSi wafer for the immobilization of artificial antigens of mycotoxins because of their high signal-to-noise ratios. Under optimal conditions, the developed method showed wide linear detection ranges of 0.01–1 ng/mL for OTA, 0.001–1 ng/mL for AFB1, and 0.01–1 ng/mL for FB1 and low limit of detections (LODs) of 0.433 ng/mL for OTA, 0.243 ng/mL for AFB1, and 0.093 ng/mL for FB1. The microarray method can specifically identify the three mycotoxins and their analogues. The recovery rates in real samples were within 75–120%, which were in agreement with that of the classical ELISA method. The new method has great application potential for rapid, sensitive, and high-throughput screening of multiplex mycotoxins and other target molecules.
研究领域:
分析化学
·
毒理学
·
食品安全
·
生物技术
✓ 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）