ACS Catalysis
·
2025
·
IF 13.1
Rui Zhai,Zhenyu Wang,Chang Huang,Chao Zeng,Mengyue Gu,Tianqi Wang,Fanqi Bu,Shaobin Wang,Jinying Zhang
Phosphorus has various crystallographic structures and variable phosphorus-derived structures, which have attracted much attention due to its unique properties. One-dimensional phosphorus structures with atomic substitution in the phosphorus lattice are extremely favored due to their high specific surface area and stable single-atom dispersion. The precise crystal structures and single atomic substitution positions are crucial factors to understand the mechanism of single-atom effects but remain a big challenge. Herein, single crystals composed of 1D zigzag linear phosphorus selenium chains (ZLP-Se) have been produced and characterized by SC-XRD to be P18.56Se1.44 with a space group of Pnma (CSD-2348033). The exact Se substitution positions were further ascertained by calculations of the whole thermodynamic stability phase diagram to have three types of substitution patterns (Se1/P1 mixed occupied positions with intervals of 3Se+2P, 1Se+4P, and 1Se+1P+1Se+2P). The selenium-rich crystal plane (-10-1) has been demonstrated to significantly enhance CO2 adsorption and C−C coupling to obtain ethylene (C2H4). A high photocatalytic CO2 reduction performance (18.0 μmol g−1 h−1, 97.0% electron selectivity for C2H4) has been achieved by the ZLP-Se with the Ag cocatalyst. The adsorption of CO2* and CO* was found to be much stronger on the Se-rich surface of ZLP-Se. The CO* intermediates were found to be energetically favored for protonation and subsequent asymmetrical C−C coupling to produce C2H4, with COCHO* intermediates detected by in situ DRIFTS. The electron was also demonstrated by in situ XPS to transfer from Se and Ag to P under Xe lamp irradiation, confirming the electronic localization effect of ZLP-Se to yield C2H4.
研究领域:
材料科学
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催化
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物理化学
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纳米技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Xianlong Lu,Lili Wang,Xueyang Zhao,Binbin Pan,Zhendong Li,Xiangfei Du,Shihan Zhang,Fan Dong,Bangwei Deng
Copper (Cu)-based catalysts show significant potential for producing high value-added C 2+ products in electrocatalytic CO 2 /CO reduction reactions (CO (2) RR). However, the structural reconfiguration during operation poses substantial challenges in identifying the intrinsic catalytic active site, especially under similar mass transport conditions. Herein, three typical and commercial Cu-based catalysts (Cu, CuO, and Cu 2 O) are chosen as representatives to elucidate the structure-activity relationship of CORR in the membrane electrode assembly electrolyzer. Notably, only the Cu catalyst demonstrates the most suppression of hydrogen evolution reaction, thus achieving the highest FE of 86.7% for C 2+ products at a current density of 500 mA cm –2 and maintaining a stable electrolysis over 110 h at a current of 200 mA cm –2 . The influence of chemical valence state of Cu, electrochemical surface area, and local pH were firstly investigated and ruled out for the significant FE differences. Finally, based on the structure analysis from high resolution transmission electron microscope, OH – adsorption, in situ infrared spectroscopy and density functional theory calculations, it is suggested that the asymmetric C-C coupling ( via *CHO and *CO) is the most probable reaction pathway for forming C 2+ products, with Cu (100)-dominant grain boundaries (GBs) being the most favorable active sites. These findings provide deeper insights into the synergistic relationship between crystal facets and GBs in electrocatalytic systems.
研究领域:
电化学
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催化
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材料科学
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纳米技术
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL COMMUNICATIONS
·
2017
·Vol. 53
·期 74
·10295-10298
·
IF 6.319
Huihuang Fang,Junmou Du,Chenchen Tian,Jianwei Zheng,Xinping Duan,Linmin Ye,Youzhu Yuan
Evenly dispersed tungsten carbides with controlled phase compositions that exhibit an impressive capacity to carry out the regioselective hydrogenolysis of inert aryl ether C–O bonds instead of aliphatic C–O bonds to produce aromatic compounds are reported.
研究领域:
催化
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有机化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Open Ceramics
·
2023
·
IF 0
Zhaoju Yu,Zhenyue Wang,Xichao Dong,Jia Sun,Xingang Luan,Ralf Riedel
Liquid polymeric precursors have found wide applications as a matrix source for continuous fiber reinforced ceramic matrix composites (CMCs) because of their excellent fluidity and high ceramic yield. In the present study, a processable liquid single-source-precursor was synthesized using allylhydropolycarbosilane (AHPCS) and low-cost hafnium tetrachloride (HfCl 4 ) as raw materials to form final SiC-HfC-C nanocomposites by well-known polymer-derived ceramic (PDC) approach. The precursor synthesis, thermal behavior, polymer-to-ceramic transformation and ceramic phase evolution were investigated by FT-IR, TGA, XRD and TEM. The TGA results show that the obtained single-source-precursor exhibits very high ceramic yields of over 80.0 wt% after heat treated at 1400 °C. After annealing at 1600 °C, the resultant SiC-HfC-C nanocomposites contain SiC@C and HfC@C nanoparticles with SiC and HfC as cores and amorphous carbon as shells. The present single-source-precursor is candidate material for CMC applications due to its liquidity and high ceramic yield.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
DOI
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·
IF 2.4
Chen Mao,Chen Buxin,Jiang Yang,Zheng Kui,Hu Meilong,Qiu Shuxing
Ti(C,N) is commonly observed in vanadium titanomagnetite blast furnaces and greatly affects the stable and smooth operation of the smelting processes. To get fundamental insight into Ti(C, N) formation, systematic experiments were conducted to investigate the effects of the composition of slags, temperatures, reaction time and reaction atmosphere on the formation of Ti(C,N) from TiO 2 -containing slags. The results show that TiN and TiC contents increase with TiO 2 content increases. When TiO 2 is larger than 30 wt pct, TiN contents increase dramatically. Control of basicity, MgO and Al 2 O 3 concentrations in the slag could help to reduce Ti(C,N) contents in slags. TiN and Ti(C,N) contents increase dramatically with the extension of time. TiN is more easily formed at high temperatures, and TiN contents increase with the increase of temperature. With the increase of N 2 contents, TiC contents are relatively stable, and TiN and Ti(C,N) contents increase almost linearly. H 2 would greatly promote the formation of TiC. This paper can provide a theoretical basis for minimizing the formation of Ti(C,N) in different blast furnace conditions.
研究领域:
冶金学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC COMMUNICATIONS
·
2018
·
IF 1.377
Xinyuan Ma,Qiong Mo,Jie Chang,Kai Xie
This paper mainly studied Pd-catalyzed regioselective chlorination of disubstituted 1,2,3-triazoles directed by the 1,2,3-triazole ring. A series of regioselective chlorinated products were synthesized in 47–86% yields using Pd(OAc)2 as a catalyst and CuCl2 as a chlorinated reagent. This method provides a new mean for the synthesis of 1,2,3-triazole halides which combines the formation of C-X bond with C-H activation.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 22
·4577-4586
·
IF 6.331
Yongjia Tang,Haoran Xu,Yaxue Dai,Fang Wang,Wenjing Huang,Peifei Liu,Yueqing Gu
Hepatocellular carcinoma (HCC) is one of the most common malignant tumors with limited diagnosis. Mesenchymal epithelial transition factor (c-Met) has become a hot target for cancer diagnosis and therapy, which is overexpressed in HCC. In this study, we labeled a novel c-Met targeting peptide YQ-M3 with a near-infrared fluorescent dye MPA and a radionuclide technetium-99m for HCC detection. YQ-M3-MPA showed high affinity for c-Met positive HepG2 tumor in vitro and higher tumor uptake and higher T/N ratio than GE137-MPA (a positive tracer for c-Met) in HepG2 tumor-bearing mice in vivo by fluorescence imaging. In addition, 99mTc-HYNIC-YQ-M3 also showed significant tumor uptake in vivo through SPECT imaging. These results indicated that c-Met positive tumors were successfully detected via fluorescence and SPECT imaging using YQ-M3-MPA and 99mTc-HYNIC-YQ-M3, respectively, and further suggested that YQ-M3-MPA and 99mTc-HYNIC-YQ-M3 have some possibly potential clinical applications for HCC diagnosis.
研究领域:
肿瘤学
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分子生物学
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医学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Asian Journal of Organic Chemistry
·
2023
·Vol. 12
·期 5
·e202300015
·
IF 2.7
Yu-Tong Duan,Zhong-Xia Wang
Graphical Transition-metal-free reaction of oxindoles with primary or secondary alcohols in the presence of LiO t Bu affords α-C-alkylated oxindoles. Transition-metal-free α-C-alkylation of oxindoles with alcohols was performed. The reaction requires the presence of LiO t Bu and proceeds under thermal conditions. The method exhibits a wide scope of substrates. Both primary and secondary aliphatic and aromatic alcohols can be employed as the alkylating reagents. Oxindole and various 1-alkyl- or 1-aryl-substituted oxindoles can be alkylated. The mechanistic studies show that the reaction may involve both free radical and aldol condensation/MPV processes.
研究领域:
有机化学
·
合成化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qiao Li,Yang Huang,Zhong Pan,Jiancong Ni,Weiqiang Yang,Jianhua Chen,Ying Zhang,Jianmin Li
Novel hollow C, N-TiO 2 @C surface molecularly imprinted microspheres (HCNTC-SMIPs) with hydrophilicity, reusability, and selectivity were synthesized. The core–shell hollow structure yields large specific surface areas, high surface-to-volume ratios and effective diffusion rate on both inner and outer exposed surfaces. The C, N-TiO 2 shell possesses high photo-catalytic decomposition capacity toward the specific pollutants. Moreover, TiO 2 acts not only as a photocatalyst but also as a double cross-linker agent of molecularly imprinted to significantly reduce the molar ratio of formaldehyde. The hydrophilic surface imprinted layer provides the recognition sites and specific pore structures. The results showed that HCNTC-SMIPs possessed a high specific surface area of 305.10 m 2 g −1 and a good visible light harvesting property with a bandgap of 1.67 eV. This could efficiently suppress the photoelectron-hole recombination, and thereby heightening the photocatalytic degradation of sulfadiazine (SDZ). The photodegradation efficiency of HCNTC-SMIPs can reach 99.25 % within 140 min and 90.00 % after 6 cycles. The HCNTC-SMIPs had a higher kinetic constant (0.01815 min −1 ) than those of HCNTC (0.00964 min −1 ) and TiO 2 (0.00548 min −1 ). HCNTC-SMIPs can achieve targeted and efficient SDZ removal, as well as in-situ regeneration. The possible degradation pathways of SDZ primarily includes smiles-type rearrangement, SO 2 extrusion, ring hydroxylation, direct oxidation and S N bond cleavage processes based on LC-MS analysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guanjie Zeng,Xiaozhong Huang,Jiyang Li,Jianling Yue,He Zhang,Xiu-Zhi Tang
Creating multifunctional materials that can serve in extreme environments is of critical importance but also a formidable challenge. Herein, we present a simple technique that combines carbothermic reduction and organic template carbonization to produce multifunctional SiC/C hybrid fabrics from inexpensive cotton mats. The obtained fabrics display high resilience to high/low temperature, anti-oxidation, and chemical assault is exhibited. Additionally, the fabric's ultralow thermal conductivity results in superior thermal insulation performance. Notably, these in situ-generated SiC nanowires considerably improve the ductility of the ceramic fabric. The compression strength and the breaking elongation increased by 39% and 2.6%, respectively, as compared to the SiC fabric without grown nanowires. When employed as an electromagnetic interference shielding material, it exhibits an excellent EMI shielding capability with a SE value of 40 dB. This research advances not just the usability of flexible ceramic fabrics in severe environments, but also the creation of fine structures in ceramic materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Minghua Wang,Dan Guo,Bochong Wang,Jianyong Xiang,Kun Zhai,Tianyu Xue,Fusheng Wen,Yingchun Cheng,Congpu Mu
In this work, MIL-96 (Ga) was successfully synthesized by a microwave-assisted method and pyrolyzed at 700 o C to obtain Ga 2 O 3 /C (G-700) composites. After carbonization, Ga 2 O 3 nanoparticles were uniformly embedded in a porous carbon skeleton. The surface of MIL-96(Ga)-derived Ga 2 O 3 /C was used as a template for directional pyrrole polymerization. G-700@PPy composite materials were obtained by in-situ polymerization of pyrrole on the surface of G-700. A hierarchical interfacial structure was created with regulated dielectric properties. The effect of pyrrole doping content on the electromagnetic waves (EMWs) absorption properties of G-700@PPy composite materials was studied. The experimental result showed that the minimum reflection loss ( RL min ) value of G-700@PPy-3 composite materials reached -79.0 dB under a thin thickness of 1.58 mm, and the maximum effective absorption bandwidth (EAB) of 5.66 GHz was obtained under 1.78 mm. The results indicate that highly conductive PPy could significantly improve the impedance matching conditions and electromagnetic attenuation capacity of G-700 composite materials, which provided an important idea for optimizing the microwave absorption properties of low permittivity composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2017
·
IF 4.849
Jian Cheng,Jun Sun,Jiekuan Yan,Song Yang,Pengcheng Zheng,Zhichao Jin,Yonggui Robin Chi
The metal-free catalytic functionalization of aromatic sp2-carbons and benzylic sp3-carbons remains challenging. Here we report a carbene-catalyzed functionalization of the 3-methyl sp3-carbon attached to 2-formyl-indoles. The reaction proceeds through an NHC-bound o-quinodimethane as the key intermediate generated from 2-formyl-3-methylindoles under oxidative conditions. Reactive ketones are found to be effective substrates to produce substituted hydropyrano[3,4-b]indoles in good to excellent yields.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）