ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 21
·2101145
·
IF 18.808
Xiaoming Zhou,Yang Liu,Yang Ren,Tiansheng Mu,Xucai Yin,Chunyu Du,Hua Huo,Xinqun Cheng,Pengjian Zuo,Geping Yin
SiO x /C composites with a void-reserving structure are promising anodes for lithium-ion batteries. However, the facile and controllable synthesis of uniformly dispersed SiO x and carbon components, simultaneously incorporating ample voids, still remains a great challenge. Herein, a molecular polymerization strategy is devised to construct SiO x /C hollow particles for lithium-ion batteries. 3-aminopropyltriethoxysilane and dialdehyde molecules are judiciously engineered as silicon and carbon precursors to produce the polymer hollow spheres (PHSs) through a one-step aldimine condensation without any template and additive. A range of PHSs is obtained using terephthalaldehyde, glutaraldehyde, and glyoxal as the crosslinkers, demonstrating the high tunability of the strategy. Importantly, in situ pyrolysis of the PHSs warrants the homogeneous incorporation of SiO x ( < 5 nm) in carbon hollow capsids at a nanocluster scale. The obtained SiO x /C hollow spheres exhibit excellent Li + -ion storage behaviors, including cycling lifespan, coulombic efficiency, and rate performance. The superior performance is attributed to the well-dispersed SiO x nanoclusters in carbon substrate and the hollow structure. This molecular polymerization approach not only enables Si-based hollow composites effective and scalable anode materials but also opens up a new avenue for the controllable synthesis of template-free hollow architectures.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Shaoming Yang,Yaqi Wang,Jiayi Chen,Yun Feng,Jiahui Li,Yongxin Liu,Liangpeng Zeng,Ji Zhao,Jiali Zhang
Owing to its environmental compatibility and energy conservation properties, photocathodic protection (PCP) has emerged as a promising approach for metal corrosion protection. The key to efficient PCP lies in developing semiconductor composite materials that combine excellent photoelectrochemical performance with a simple preparation process. Herein, a carbon-doped TiO 2 /Bi 2 S 3 composite (Bi 2 S 3 /C-TiO 2 ) was fabricated via a single-step, low-temperature hydrolysis strategy using NH 2 -MIL-125(Ti) as the precursor, concurrently achieving carbon doping and incorporating a narrow-bandgap semiconductor. Characterization by UV-Vis diffuse reflectance spectroscopy and photoelectrochemical testing under illumination revealed that the composite exhibits significantly enhanced visible-light absorption while effectively suppressing photogenerated charge carrier recombination. Under optimized conditions, the Bi 2 S 3 /C-TiO 2 photoanode shifted the potential of coupled 304 stainless steel (304SS) to −464 mV (vs. Ag/AgCl) under visible-light irradiation—substantially below its corrosion potential—demonstrating effective photogenerated cathodic protection for 304SS.
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产品关联
DOI
高影响因子
Nature Catalysis
·
2021
·Vol. 4
·期 5
·364-373
·
IF 41.813
Cui Yinglu,Wang Yinghui,Tian Wenya,Bu Yifan,Li Tao,Cui Xuexian,Zhu Tong,Li Ruifeng,Wu Bian
Although C–N bonds are ubiquitous in natural products, pharmaceuticals and agrochemicals, biocatalysts forging these bonds with high atom-efficiency and enantioselectivity have been limited to a few select enzymes. In particular, ammonia lyases have emerged as powerful catalysts to access C–N bond formation via hydroamination. However, the use of ammonia lyases is rather restricted due to their narrow synthetic scope. Herein, we report the computational redesign of aspartase, a highly specific ammonia lyase, to yield C–N lyases with cross-compatibility of non-native nucleophiles and electrophiles. A wide range of non-canonical amino acids (ncAAs) are afforded with excellent conversion (up to 99%), regioselectivity >99% and enantioselectivity >99%. The process is scalable under industrially relevant protocols (exemplified in kilogram-scale synthesis) and can be facilely integrated in cascade reactions (demonstrated in the synthesis of β-lactams with N-1 and C-4 substitutions). This versatile and efficient C–N lyase platform supports the preparation of ncAAs and their derivatives, and will present opportunities in synthetic biology.
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高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Hui Huang,Lingjun Kong,Ming Liu,Jie He,Wei Shuang,Yunhua Xu,Xian-He Bu
The large-scale application of Zn-air battery requires the development of efficient, low-cost, and stable bifunctional electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Herein, an electrocatalyst of a Co/MoC-nanoparticles embedded N-doped carbon (Co/MoC@N-C) was prepared via the in-situ encapsulation of Co 2 (CO) 8 and Mo(CO) 6 in ZIF-8 using ball-milling, followed by pyrolysis under an Ar atmosphere. When used as a bifunctional electrocatalyst, the as-prepared Co/MoC@N-C showed an ORR half-wave potential of 0.824 V in an alkaline medium and an overpotential of only 290 mV for the OER at 10 mA cm − 2 , which was 70 mV lower than RuO 2 . The Co/MoC@N-C was also evaluated as a cathode in a solid-state Zn-air battery and delivered a higher peak discharge power density and better cycling stability (over 1600 min) than Pt/C-RuO 2 . Most importantly, our work provides a new strategy to prepare bifunctional catalysts and promotes their applications in the energy conversion field.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 12
·17518-17528
·
IF 5.532
Yu Zhao,Liaoyuan Chen,Jiayu Sun,Wenzheng Wu,Tianbiao Yu
Poor mechanical properties of Ni alloy hinder its widespread application in the industrial. In order to enhance its performance, Ni204-based composite coatings reinforced with in-situ TiC and (Ti, Nb)C particles were investigated and successfully built on 45 steel alloy via laser cladding technology. The strengthening phase characteristics, microstructure evolution, and mechanical properties of the samples were examined and analyzed. By doping Ti and C particles into the NbC–Ni composite coatings, the large lump structure of NbC was effectively eliminated. The alternative formation of TiC and NbC promoted the in-situ generation of the multiphase (Ti, Nb)C and further prevented the NbC from agglomerating. Therefore, the problem of TiC particles floating has been effectively alleviated. The microhardness is up to 1.53 higher than that of the original Ni204 coating. Compared with the mass fraction ratio of Ti/C/NbC is 7:2:21 composite coating, the wear resistance of the composite coating (the addition of NbC is 30%) is improved by around 11 times. The composite coating has excellent combination property when the mass fraction ratio of Ti/C/NbC is 4:1:5. This work provides insight into the Ni204-based composite coatings by ceramic reinforcement.
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高影响因子
CARBON
·
2026
·
IF 12.7
Min Liu,Wei Wang,Yu Feng,Shuai Yuan,Jiaxin Zheng,Junkai Zhang,Jiahui Fan,Yiwu Pan,Shitong Zhou,Xiangyu Jin,Changqing Hong
An in situ SiO 2 -Al 2 O 3 aerogel network repairs macropores and weak interfaces in C/CA. • Hierarchical interfacial reinforcement enhances mechanical strength, cyclic resilience, and electromagnetic shielding. • The composite provides efficient thermal insulation and stable protection under high heat-flux and repeated flame ablation. Carbon aerogels and their fiber-reinforced composites (C/CA) show great promise for thermal protection owing to their lightweight, porous structure and excellent thermal stability. However, their susceptibility to high-temperature oxidation and macroscopic defects induced by shrinkage mismatch during carbonization severely limit reliable service in extreme environments. To address these challenges, this work proposes a carbon/ceramic aerogel composite design strategy based on the synergy between heterogeneous interface reinforcement and in situ defect repair. A continuous SiO 2 -Al 2 O 3 aerogel network was in situ constructed on the surface and within the pores of the C/CA skeleton via a sol-gel method, yielding lightweight C/CA-SiO 2 -Al 2 O 3 composites with high strength, durable thermal protection, and electromagnetic interference shielding capability. The optimized C/CA-SiO 2 -Al 2 O 3 -3 exhibited high specific surface area and excellent mechanical properties, maintaining stable stress-strain responses after 100 compression cycles. Benefiting from synergistic effects of conduction loss, interfacial/dipole polarization, and multiple scattering, its total electromagnetic interference shielding effectiveness was enhanced by approximately threefold. Moreover, the composite showed outstanding ablation resistance, retaining low back-side temperature and good shape integrity after five repeated ablation cycles. This work provides a carbon/ceramic aerogel composite design strategy integrating heterogeneous interface reinforcement, functional limitations of large-area thermal protection materials under repeated high-temperature exposure and repeated service. Download: Download high-res image (449KB) Download: Download full-size image
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Zhihua Tian,Bingzhen Yan,Fushuo Wu,Jingwen Tang,Xueqin Xu,Jian Liu,Peigen Zhang,ZhengMing Sun
Herein, high-purity Ti 2 (In x Al 1- x )C ( x = 0–1) solid solutions were successfully synthesized. The crystal structure and actual composition of solid solutions were confirmed using XRD, SEM, and TEM analyses, and their formation mechanism was revealed by thermal analysis. On the In-rich side ( x ≥ 0.5), primary Ti 2 InC first formed and then acted as a crystalline seed for the subsequent solid solutions, resulting in a cluster-like morphology. The lattice constants of Ti 2 (In x Al 1- x )C were found to well follow Vegard’s law. The examined properties of Ti 2 (In x Al 1- x )C also greatly depended on their A-site compositions. Ti 2 AlC exhibited the highest hardness and elastic moduli, while the best corrosion resistance was achieved at Ti 2 InC, and all Ti 2 (In x Al 1- x )C displayed active dissolution in 0.5 M HCl solution. Thus, adjusting the In/Al ratio at A-site can yield a desired set of performances, which provides a good example for regulating the performance of MAX phases via A-site solid solution strategy.
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高影响因子
IONICS
·
2021
·Vol. 28
·期 1
·191-200
·
IF 2.817
Chen Zi-Liang,Gu Yi-Jing,Luo Gui-Yang,Huo Yong-Lin,Wu Fu-Zhong
Although researchers have previously examined whether graphene modified by sulfur can improve the electrochemical performance of LiFePO 4 /C composites, they have rarely examined whether it can do so during the synchronous synthesis of LiFePO 4 /C and sulfur-modified reduced graphene oxide (SG) via a one-step hydrothermal method. To answer this question, a series of olivine structure LiFePO 4 /C composites wrapped with SG were investigated. Subsequently, we found that SG can form a three-dimensional conductive network on the surface of the LiFePO 4 /C sample. In the process, XRD and HRTEM tests were undertaken as well. From the XRD test, the results show that SG does not affect the olivine structure of LiFePO 4 /C. In the HRTEM experiment, clear lattice fringes and a uniformly coated carbon layer on the sample surface were observed. Alongside these results, there were 4 others. First, the charge–discharge data showed that the electrochemical performance of the samples could be increased by SG modification. Second, sample S2 with a mass ratio of Na 2 S to rGO of 1:10 shows the best specific discharge capacity and stability. Third, the specific capacity of S2 is 163 mAhg −1 at 0.2 C, and the capacity retention is 108.23% even after 200 cycles at a magnification of 10 C. Fourth, according to EIS, the charge migrating resistance of S2 is 226.4 Ω, and the lithium-ion diffusion coefficient is 2.41 × 10 −14 cm 2 ·S −1 . The significance of these results is that they indicate that wrapping LiFePO 4 /C with SG significantly contributed to the improvement of its electrochemical performance.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 10
·e6342
·
IF 4.105
Yue Dai,Tangtong Ju,Hailong Tang,Meiling Wang,Min Wang,Yongqing Ma,Ganhong Zheng
A novel composite of N-doped TiO 2 -quantum dots tightly anchored on graphene (denoted as N-doped TiO 2 -QDs@GP) with superior interfacial contact via C–Ti bond was synthesized via the simple one-pot vapor-thermal method. The as-obtained N-doped TiO 2 -QDs@GP includes TiO 2 QDs with an average size of 3.28 nm uniformly distributed on the surface of GP. The large specific area and superior interfacial contact via C–Ti bond ensured its potential photocatalytic application. Except for the effective interfacial charge transfer achieved via C–Ti chemical bond between TiO 2 QDs and GP, its enhanced visible light absorption and larger oxygen vacancy ratio also make contributions. Electron spin resonance spectra (ESR) were used to study the photocatalytic mechanism, which proved the participation of both superoxide radical (·O 2 − ) and hydroxyl radical (·OH) in the photocatalytic reactions. This work provides a promising one-pot method for constructing intimately contacted N-doped TiO 2 /GP composite with superior interfacial contact via C–Ti bond and excellent photocatalytic activities.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mengxuan Zhang,Lu Zhao,Dong Sun,Yankun Sun,Chunming Xu,Shichao Lu,Tao Li,Yongfeng Li,Zhihua Xiao
The poor electronical conductivity and large volume change of nano-silicon anode has seriously hindered its further application. To overcome these drawbacks, we employed the S-doped multiwalled carbon nanotubes (SCNTs) as the conductive additive to fabricating a scaffolded framework for the first time. The as-assembled Si anode with 5 wt% SCNTs (Si@C-5SCNTs) shows a large specific capacity of 939 mA h g −1 at 2 A g −1 within 0–1 V, significantly higher than that of Si@C (466 mA h g −1 ) and Si@C-5CNTs (720 mA h g −1 ), showing a superior rate performance. Besides, it shows higher initial coulombic efficiency, Li-ion diffusion coefficient, cycling performance, and smaller volume change than that of Si@C and Si@C-CNTs at room temperature. Even at 40 ℃, the Si@C-5SCNTs anode still show a superior rate performance (1842 and 819 mAh g −1 at 0.05 and 2 A g −1 , respectively) and cycling stability (83.6% capacity retention) than that of Si@C and Si@C-5CNTs. To better explain the significantly enhanced electrochemical performance of Si anode both room and high temperature conditions, both the chemo-mechanical coupling and internal temperature distribution models have been rational constructed, and further demonstrated that the SCNTs can effectively buffer the volume expansion and reduce the internal local temperature rise.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lifeng Zhang,Yifei Song,Yue Hu,Huan Ruan,Jiaxi Bai,Shuai Li,Yi Liu,Shouwu Guo
Antimony-based electrode materials with conventional slurry-casting process still face great challenges such as tedious preparation process and unsatisfying cycling stability for sodium ion batteries (SIBs). Therefore, the design and fabrication of integrated electrodes with binder-free and even current collector-free are highly significant. Herein, we fabricated flexible Sb/Sb 2 O 3 -C nanofibers (NFs) films utilizing a facile combination of electrospinning technique and carbonization . Sb/Sb 2 O 3 nanoparticles are well embedded in carbon NFs with a fiber diameter of ca. 340 nm. The fabricated NFs films can be directly used as binder and current collector-free anodes for SIBs and exhibited high-capacity and long-lifetime cycles (385.6 mAh g −1 over 500 cycles). Ex situ SEM and TEM observations re-appear their intact fibrous network morphology and stable one-dimensional composite structures after hundreds of discharging-charging cycles, demonstrating that Sb/Sb 2 O 3 -C NFs film is a promising binder-free electrode for SIBs.
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高影响因子
Current Protocols
·
2022
·Vol. 2
·期 6
·e432
·
IF 0
An-Di Liu,Zhao-Li Wang,Li Liu,Liang Cheng
The photoredox synthesis of C-5 (hetero)arylated uracil and uridine substrates with the corresponding diazonium salts is described. The coupling proceeds efficiently without protection of the hydroxyls at the ribose or pre-functionalization of the C5 position at the nucleobase. No transition-metal catalyst is used in this transformation, thereby avoiding metal contamination in the final products. The use of water as the medium also eliminates the impurities caused by the use of organic solvents. © 2022 Wiley Periodicals LLC. Basic Protocol 1 : Synthesis of 5-aryl and 5-heteroaryl uracil derivatives Basic Protocol 2 : Synthesis of 5-aryl uridine and deoxyuridine uridine derivatives
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