Applied Materials Today
·
2023
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IF 8.3
Guiyang Yu,Ke Gong,Lan Hu,Chuanwang Xing,Yujia Hu,Debao Wang,Xiyou Li
The development of mild and environmental method for direct transformation of aromatic alcohol into hydrobenzoin via controlled C‒C coupling is a highly attractive but challenging goal. In this paper, a P-doped g-C 3 N 4 photocatalyst with NiS nanoparticles modification is first reported to apply the visible-light-driven C‒C coupling of aromatic alcohol into hydrobenzoin, as well as integrating with the production of clean H 2 fuel. The synergistic effect of doped P atoms and formed type-II heterojunction between PCN and NiS improves the light absorption ability of g-C 3 N 4 and greatly suppresses the charge recombination. Optimized 2.0% NiS/PCN composite achieves the complete conversion of aromatic alcohol within 6 h reaction time, as far as we known, which is the highest efficiency so far for aromatic alcohol conversion via photocatalytic strategy. Hydrobenzoin is controllably formed with 68% selectivity, together with a highly-efficient H 2 production rate of 994.8 μmol·g −1 ·h −1 . In-situ EPR studies reveal a preferential activation of C‒H bond than O‒H bond in aromatic alcohol by photoexcited holes, forming C 6 H 5 ĊH 2 OH radicals for subsequent coupling. The residual protons interact with photoexcited electrons to generate H 2 . Our study not only offers an efficient g-C 3 N 4 -based photocatalyst for the synthesis of hydrobenzoin under mild conditions, but also opens up a new avenue for manipulating the activation of C‒H or O‒H bonds for high selectivity of hydrobenzoin product.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Powder Materials
·
2025
·
IF 24.9
Yang Li,Bin Sun,Ying Li,Chong Zhang,Pu-Jun Jin,Xin Wang,Bao Yu Xia,Yu Chen,Xuan Ai
The large-scale implementation of direct ethylene glycol fuel cells (DEGFCs) relies on the design of catalysts that possess exceptional activity, durability, and efficient C–C bond breaking ability. However, Pt and Pd-based nanomaterials continue to face challenges of low selectivity and slow reaction kinetics in driving the complete oxidation of ethylene glycol to CO 2 . In this work, a facile one-pot reduction method is reported for controllable synthesis of PtBi nanodendrites (PtBi-NDs) composed of ultrathin bimetallene subunits. In alkaline media, the composition optimized PtBi-NDs demonstrate outstanding activity and strong resistance to CO poisoning during the ethylene glycol oxidation reaction (EGOR). The PtBi-NDs show 5.8-fold higher mass activity, enhanced stability, and superior C1 selectivity relative to commercial Pt nanoparticles (Pt c-NCs). Most strikingly, PtBi-NDs deliver a higher power density (8.3 mW cm –2 ) than Pt c-NCs in DEGFCs. The theoretical analysis and experimental measurements explain that the introduction of Bi element into Pt induces d–p orbital hybridization and promotes electron transfer from Bi to Pt, thereby facilitating C–C bond cleavage and boosting EGOR kinetics. This work establishes an effective strategy for constructing Pt-based ultrathin bimetallenes and offers fundamental insights into boosting EGOR performance via d-p orbital hybridization.
研究领域:
电催化
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纳米材料化学
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能源化学
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物理化学
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燃料电池
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Zhenxiao Tang,Maozhong Yi,Qiuling Xiang,Yuhui Du,Ke Peng
An improved high-solid-loading slurry impregnation process was developed to introduce HfB 2 particles into a low-density C/C preform efficiently, and precursor infiltration and pyrolysis process was used for densification to obtain a C/C-HfB 2 -SiC composite. The microstructure characterization revealed that HfB 2 particles uniformly filled the pores in the C/C preform, and SiC well densified the interstices between HfB 2 particles and the small pores in the carbon fiber bundles. After being tested, the C/C-HfB 2 -SiC composite had a density of 4.07 g/cm 3 and a bending strength of 344.8 MPa, and exhibited a non-brittle fracture behavior. After ablation with oxyacetylene flame at 2500 ℃ for 120 s, the mass ablation rate and linear ablation rate of the C/C-HfB 2 -SiC composite were 0.5 mg/s and 0.415 μm/s, respectively. The good ablation performance is attributed to the hindering effect of the HfO 2 scale on oxygen diffusion at high temperature.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2019
·
IF 6.355
Haibo Ouyang,Yulei Zhang,Cuiyan Li,Guibiao Li,Jianfeng Huang,Hejun Li
C/C-ZrC-SiC composites were fabricated by carbothermal reaction of hydrothermal co-deposited oxides and resulted in homogeneous microstructure. The fracture behavior passed from pseudo-plastic to brittle fracture with the increase in ZrC/SiC molar ratios. The composites with a molar ratio of ZrC/SiC≈2:1 presented outstanding ablation resistance with a mass ablation rate of 0.06 mg cm −2 s −1 and a linear ablation rate of 0.13 μm s −1 . The optimal ZrC/SiC molar ratio provided a suitable balance of viscosity and flowability of the oxides scale, which not only possessed enough solid ZrO 2 to endure the scouring but also had moderate liquid-phase to seal the defects and limited the oxidation.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Aolin Xie,Bei Zhang,Yichun Ge,Xiaodong Wang,Ping Xu,Zhirong Feng,Maozhong Yi,Zhe Zhou
To ensure the performance of C/C composites, a surface-modified C/C composite was prepared with a C/C composite as the substrate, one-dimensional SiC as the intermediate, and vertically oriented graphene as the modification material without changing the microstructure or composition of the C/C composites. C/C composite surface modifications were prepared in two steps. Its specific surface area is improved from 0.25 m 2 /g to 10.44 m 2 /g, and the electromagnetic interference shielding efficiency is enhanced from 13.08 dB to 23.86 dB. Different from the C/C composites without surface modification, the electromagnetic interference shielding mechanism of surface-modified C/C composites changed from electromagnetic reflection to the interaction of electromagnetic absorption and reflection. The reason is that the increased specific surface area elongates the transmission paths of the electromagnetic waves by multiple reflections, leading to significantly improved electromagnetic interference shielding efficiency.
研究领域:
材料科学
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电磁干扰屏蔽
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纳米材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Chen Zeng,Mingyu Zhang,Hanwei He,Xiaodong Wang,Kai Tong,Yafeng Wang,Ping Xu,Lei Zheng,Guang Zeng,Zhean Su,Qizhong Huang
Sol-gel is a promising technology to prepare the C/C–ZrC–SiC composites. However, carbon fiber erosion caused by carbothermal reduction severely degrades properties of the composites. At present study, the addition order of carbon source during sol-gel process was optimized to improve the microstructure, mechanical property and ablation resistance of the composites. Results show that adding phenolic resin before gelation combined with deposited pyrocarbon interlayer around the carbon fibers can greatly alleviate the degradation of the C/C–ZrC–SiC composites by reducing the carbon fiber erosion. The composites thus prepared delivered the flexural strength , mass and linear ablation rates are 162.58 MPa, 0.147 mg/(cm 2 ⋅s) and 0.0098 mm/s, respectively, which are 449% higher, 9.26% lower and 38.36% lower than those of the counterpart that added phenolic resin after gelation. The excellent performance is attributed to little erosion of the carbon fibers and the dense matrix of ZrC–SiC ceramics obtained from adding carbon source before gelation during the sol-gel process.
研究领域:
材料科学
·
复合材料
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航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
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IF 5.089
Shengnan Zhao,Song Song,Yong You,Yingtian Zhang,Wei Luo,Kaijie Han,Tong Ding,Ye Tian,Xingang Li
Heterogeneous photocatalytic C-C coupling is a green and efficient approach to producing valuable chemicals. The strategies for guiding effective photocatalyst design are desired but still limited. Here, we report visible-light-driven highly selective photocatalytic C-C coupling of benzyl alcohol over surfactant-modified Zn 3 In 2 S 6 semiconductors. A complete switch of product selectivity from benzyl aldehyde (91.5 %) to C-C coupling products (96.5 %) is obtained by the modification of Zn 3 In 2 S 6 with stearyl trimethyl ammonium bromide (STAB). This modification assists the formation of sulfur vacancies on Zn 3 In 2 S 6 to enhance charge carrier separation, thereby increasing the photocatalytic activity. The selectivity switch is mainly attributed to increasing conduction band position of Zn 3 In 2 S 6 by surfactant modification which strengthens the reduction ability of photogenerated electrons to induce the reversible reduction of benzyl aldehyde to ketyl radicals, and partially to the poor oxidation ability of the material that inhibits the oxidation of ketyl radicals to benzyl aldehyde. Encouragingly, this universal protocol has been successfully applied to a series of aromatic alcohols and biomass-derived furanic alcohols to selectively produce C-C coupling products.
研究领域:
化学
·
材料科学
·
光催化
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yuzhu Shen,Wei Sun,Yonglong Xu,Qingbo Wen,Hongbo Zhang,Xiang Xiong
In this study, to overcome the difficulties associated with the preparation of PyC-ceramic interface and controllable deposition of the structure, we initially used a two-step molten salt infiltration method to prepare a C/C-Me-Zr-Hf (Me = Ta, Si) composite with excellent oxyacetylene ablation performance. The microstructure and the behavior of ablative were addressed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) as well as by X-ray diffraction（XRD）. The results reveals that C/C-ZrHfC-SiC composite prepared by two-step molten salt infiltration method have a controllable ultra-high temperature ceramic structure and better ablation resistance.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2020
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IF 7.539
Yong Huang,Shasha Liu,Jie Zhang,Syed Shatir A. Syed-Hassan,Xun Hu,Hongqi Sun,Xun Zhu,Jianbin Zhou,Shu Zhang,Hong Zhang
This study investigated the interactions between volatile and char during biomass pyrolysis at 400 °C, employing a β–5 lignin dimer and amino-modified graphitized carbon nanotube (CNT–NH 2 ) as their models, respectively. The results demonstrated that both –NH 2 and its carrier (CNT) facilitated the conversion of the β–5 dimer, which significantly increased from 9.7% (blank run), to 61.6% (with CNT), and to 96.6% (with CNT–NH 2 ). CNT mainly favored the breakage of C–O bond in the feedstock to produce dimers with a yield of 55.5%, while CNT–NH 2 promoted the cleavage of both C–O and C–C bonds to yield monomers with a yield up to 63.4%. Such significant changes in the pyrolysis behaviors of the β–5 lignin dimer after the introduction of CNT–NH 2 were considered to be mainly caused by hydrogen-bond formations between –NH 2 and the dimeric feedstock/products, in addition to the π–π stacking between CNT and aromatic rings.
研究领域:
能源与燃料化学
·
生物质转化
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Sihang Hu,Haiquan Liu,Mingyu Yang,Huan Dai,Chongyang Tang,Dong He,Xiangheng Xiao
The complex reaction interface and the high reaction barrier for C─C coupling hinder the conversion of CO 2 toward high-value C 2+ products. In this work, thiol is employed to modify facet-controlled Cu nanoparticles, systematically elucidating the tripartite interaction between organic modifiers, active sites, and key intermediates. Theoretical calculations, Kelvin Probe Force Microscope (KPFM), and in situ investigations reveal that the thiol-derived spatial potential field facilitates CO 2 activation and the formation of hydrocarbon intermediates ( * COH). More importantly, the results demonstrate that the C 2+ products of the thiol-modified catalyst are strongly dependent on the crystal planes: the potential field preferentially drives suitable adsorbed * COH to asymmetric * CO- * COH coupling on Cu (100)/(111) interface. Consequently, the C 2+ selectivity of the thiol-modified Cu (100)/(111) interface-rich Cu nanoparticle is intrinsically enhanced, exhibiting high selectivity to C 2+ products with a faradaic efficiency (FE) of 85.44%. Remarkably, the structure achieves a C 2 H 4 FE of 73.79% ± 2.69% with a peak partial current density of 345.75 mA cm − 2 (total current: 1.38 A). Beyond establishing a high-efficiency CO 2 to C 2+ conversion protocol, this study provides mechanistic insights into the selective steering of C─C coupling through tailored surface modifications.
研究领域:
电催化
·
材料化学
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可持续能源
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表面科学
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Fei-Feng Mao,Yi-An Wang,Yan Zhou,Ming-Shuai Sun,Wei Hui,Duan-Jian Tao
The efficient and selective conversion of biomass-derived vicinal diols into high-value-added chemicals represents a pivotal area of research that has garnered substantial interest within the scientific community. In this work, three ultralow loading Fe supports on N-doped carbon nanosphere catalysts (Fe@NC-T) were successfully prepared using the hard template method with acid etching. The selective conversion of vicinal diols into aldehydes, ketones, and amines over the Fe@NC-800 nanosphere catalyst was achieved through an anaerobic cleavage of C–C bonds and successfully utilized autologous hydrogen resources. The exceptional catalytic activity of the Fe@NC-800 nanosphere catalyst may be credited to the presence of highly dispersed Fe species at the active sites, which has been verified through several characterization techniques, control tests, and density functional theory calculations. In addition, the Fe@NC-800 nanosphere catalyst also demonstrated its wide applicability and excellent reusability under the operating conditions. We believe that this study presents an auspicious scheme for the highly selective conversion of vicinal diols into high value-added carbonyl compounds and amine products.
研究领域:
催化
·
材料科学
·
化学工程
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zhouxuan Zang,Jianhua Zhou,Ningke Pang,Wencai Bai,Yong Xiang,Yi Yu,Li Xu,Guoji Liu
High-energy-density sustainable aviation fuels are recognized as effective means to mitigate carbon emissions in the aviation sector. Here, we report various metal-modified layered double hydroxides (LDHs). The screened MgAlSn-LDH catalyst incorporating abundant oxygen vacancies and strong base sites yields (E)-1-(furan-2-yl)-5-methylhex-1-en-3-one (ALD) over 96% at 120 °C for 4 h. The catalyst exhibits promising long-term stability in a fixed-bed reactor at 170 °C. A combination of investigations using in situ DRIFTS studies and DFT calculations reveals that MgAlSn-LDH enhances the adsorption of methyl isobutyl ketone (MIBK) and furfural (FF). Further calculations have shown that the synergy of oxygen vacancies and strong base sites decreases the energy barrier of MIBK enolation, which increases the rate of the enolation reaction. This research provides a versatile synthesis method for improving the alkaline catalytic activity of LDH catalysts, and the performance of the catalysts can be extended to other upgrading processes of biomass chemicals.
研究领域:
催化
·
材料科学
·
化学工程
·
可再生能源
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表面化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）