INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuan Zhao,Qingshuang Wang,Dongming Yin,Shouliang Li,Chunli Wang,Long Liang,Shaolei Zhao,Chunmin Zhang,Limin Wang,Yong Cheng
The high dehydrogenation temperature of α-AlH 3 has always been an important factor hindering its development. In order to solve this problem, we synthesize Bi-MOF by hydrothermal method and burn it under inert gas to obtain Bi@C, which is used as catalyst ( x Bi@C, x = 3, 5 and 7 wt%) to improve the hydrogen desorption performance of α-AlH 3 . The dehydrogenation onset temperature of α-AlH 3 +5 wt% Bi@C drop to 80.4 °C, which is reduced by 43.4% compared with pure α-AlH 3 . At 120 °C, it can provide a stable hydrogen capacity of 7.45 wt%. In contrast, pure α-AlH 3 releases only 6.66 wt% hydrogen at the same time. The density functional theory calculations further indicate that the existence of Bi@C catalyst can make the Al–H bond length increase, more conducive to the release of hydrogen. The results show that the synergistic effect of Bi and porous carbon in Bi@C materials can improve the hydrogen desorption kinetics of α-AlH 3 , providing a good prospect for the application of α-AlH 3 in hydrogen storage .
研究领域:
材料科学
·
氢能存储
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Dongmei Pu,Pengju Chen,Peng Xiao,Zhuan Li,Pingyi Deng,Liang Pang,Jinwei Li,Yang Li
A dense and uniform c -AlPO 4 and SiC whisker co-modified mullite coating was successfully prepared on SiC-coated C/SiC composites with a thickness of about 70 μm by hydrothermal electrophoretic deposition . The thermal cycling performance of the coating samples was evaluated by thermally cycling between 1773 K and room temperature in a corundum tube furnace. Results show that the addition of SiC whisker (SiC w -mullite coating) significantly improved the thermal cycling resistance of single mullite outer layer on account of the toughening mechanism of SiC whiskers, such as whisker bridging and crack deflection. Then, the addition of c -AlPO 4 ( c -AlPO 4 -SiC w -mullite coating, termed ASM coating) further improved the thermal cycling resistance on account of the healing and bonding performances of c -AlPO 4 at high temperature. After 40 thermal cycles, the weight loss of ASM coating on SiC-coated C/SiC composites was 4.5% compared to 5.24% for the SiC w -mullite coating. The retention rate of compressive strength of ASM coating on SiC-coated C/SiC matrix was 80.66% compared to 73.65% for the SiC w -mullite coating.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 14
·2400527
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IF 3.4
Rongjuan Zhang,Qi Hu,Shaobo Yang,Song Yan,Yaxin Gu,Jiawei Ji,Zheng Zhou,Chaoze Liu,Xinran Li,Zihao Wang,Chengchun Tang
The arrival of the 5 G era has brought great benefits to our lives, but it has also brought problems such as electromagnetic radiation. Therefore, the demand for lightweight, high-performance microwave absorbing materials with wide effective bandwidth is increasing. Herein, MIL-53/g-C 3 N 4 is first synthesized from precursors of ferric chloride, terephthalic acid, and g-C 3 N 4 , and then thermally annealed at different temperatures to generate MOF-Fe@C nanocomposites. Heat treatment can effectively carbonize g-C 3 N 4 to amorphous carbon and reduce iron in MIL-53 to magnetic Fe and Fe 3 O 4 nanoparticles through carbon-thermal reduction reaction. The synergistic effect of dielectric loss of amorphous carbon and magnetic losses of magnetic particles enhances attenuation and improves impedance matching, enhancing microwave absorption. The RL min of MOF-Fe@C(4)-700 is as low as -72.78 dB at 9.44 GHz at a thickness of 3.18 mm and its effective absorption bandwidth is as broad as 4.88 GHz, covering most of X-band frequency range. The research introduces a novel technique for synthesizing absorbers with controllable electromagnetic characteristics by incorporating g-C 3 N 4 as carbon sources into MOF materials.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
Chem
·
2024
·
IF 19.1
Xiaoran Zhang,Xiaorong Zhu,Shuowen Bo,Chen Chen,Qingfeng Zhai,Shuang Li,Xiaojin Tu,Jianyun Zheng,Dongdong Wang,Xiaoxiao Wei,Wei Chen,Tehua Wang,Yafei Li,Qinghua Liu,San Ping Jiang,Liming Dai,Shuangyin Wang
Electrocatalysis offers a sustainable approach to artificial nitrogen fixation yet faces numerous challenges. Selective synthesis of nitrogen-containing compounds shows promise but needs significant improvement. Herein, we demonstrate selective ammonia and urea synthesis via co-electrolysis with CO 2 . High CO binding energy on Re-Mn catalysts leads to the formation of ∗C species, which serve as electron reservoirs to enhance N 2 activation for C-N coupling (N 2 + ∗C → ∗CN 2 ), followed by C-N dissociation. This results in ammonia production with a yield rate of 48.9 ± 2.4 mg g −1 h −1 and an N-selectivity of 98.4%. In contrast, Zn-Mn sites, characterized by low CO binding, facilitate the migration of CO and its coupling with adsorbed N 2 (CO + ∗N=N∗ → ∗NCON∗). Subsequent hydrogenations of ∗NCON∗ promote urea synthesis with an N-selectivity of 89.1%. Utilizing Janus coupling with two C-N pathways aims to meet energy, agriculture, and chemical industry demands. We realized the selective synthesis of ammonia and urea, respectively, in one electrocatalytic system for the first time by Janus coupling with two distinguishable C-N coupling paths from N 2 and CO 2 .
研究领域:
化学工程
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能源科学
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农业科学
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DOI
高影响因子
Environmental Science-Nano
·
2022
·Vol. 9
·期 6
·1952-1960
·
IF 9.473
Jiaqing He,Feng Gao,Haowei Wang,Fangyan Liu,Jiahui Lin,Biao Wang,Chuan Liu,Feng Huang,Zhang Lin,Mengye Wang
H2O2 is an environmentally friendly chemical for wide water treatments and H2 is regarded as an ideal substitute for traditional fossil energy. The industrial production of H2O2 is via the anthraquinone oxidation process, which, however, consumes extensive energy and produces pollution. Herein, based on the density functional theory (DFT) calculations, we report a green and sustainable piezocatalytic intermediate water splitting (IWS) process to simultaneously obtain H2O2 and H2 using C-doped KNbO3 nano single crystals as catalysts. The KNbO3 catalysts doped with suitable amounts of carbon show an enhanced water splitting rate, which could be attributed to the decreased reaction barriers on the C-KNbO3 surface and improved polarized built-in electric field, as evidenced by DFT simulations and PFM measurements. Remarkably, the piezocatalytic H2 evolution efficiency of 0.5 : 1 C-KNbO3 reaches 524.51 μmol g−1 h−1. Additionally, 0.5 : 1 C-KNbO3 could generate H2 and H2O2 simultaneously through two-electron piezocatalytic IWS reactions. This improved catalytic efficiency is attributed to the promoted piezo-response of KNbO3 after C doping, as revealed by PFM tests.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2013
·
IF 1.304
Qi SONG,Jiaying CAI,Junjie ZHANG,Weiqiang YU,Feng WANG,Jie XU
Phenethyl phenyl ether (PPE) was selected as a typical lignin model compound and hydrogenated and cleaved over two readily accessible nickel-based catalysts, which could be easily separated from the product mixture. The results revealed that the reduction of the nickel catalyst with gaseous hydrogen produced a species capable of achieving higher activity towards C-O-C bond cleavage compared to the Ru/C and Pd/C catalysts. The selectivity of the C-O-C bond cleavage over the Ni/C catalyst was 85%, and higher than the corresponding values in the Ru/C (40%) and Pd/C (69%) systems. Using the carbothermal reduction method for the production of the Ni/C-C catalyst, the conversion and selectivity levels reached 99%, with 40% of the benzene rings in PPE being reserved. In comparison, no benzene ring containing products wer observed over the noble metal catalysts. This difference was attributed to the interaction between the carbon support and the nickel nanoparticles. 摘要 研究了Ni基催化剂上木质素模型化合物苯基苯乙醚中C–O–C键加氢裂解性能. 结果表明, 14;Ni/C催化剂显示出优异的加氢裂解能力, 14;苯基苯乙醚的转化率达到99%以上. Ni/C催化剂的还原方法对裂解选择性有重要影响; 氢气还原制备的Ni/C-H催化剂上, 14;C–O–C键裂解选择性为85%. Ru/C和Pd/C催化剂上裂解选择性分别为40%和69%. 采用碳热还原方法制备的Ni/C-C催化剂, 14;可以实现高选择性加氢和裂解, 14;C–O–C键裂解选择性达到99%以上, 14;其中芳烃化合物收率为44%. 这可能与镍组分和载体碳之间的相互作用有关.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
TETRAHEDRON
·
2019
·Vol. 75
·期 31
·4174-4179
·
IF 2.379
Yingying Zuo,Feng Xiong,Jing Zhao
Organic sulfur compounds have broad applications in biology, medicine and material sciences and intensive efforts have been devoted to developing mild and general C–S bond-forming methods. However, a mild, transition-metal-free, direct C–H bond functionalization method remains elusive. Here, we report the use of an internal oxidant-directing strategy to achieve this goal. The cascade reactions described here show excellent chemoselectivity and a wide substrate scope for both oxyamines and sulfenylation reagents. This study enlarges the synthesis toolbox for preparing structurally diverse sulfilimines under mild conditions.
研究领域:
有机化学
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合成化学
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药物化学
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生物医学材料
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分子生物学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Yanqin Yang,Mengmeng Kang,Shaoming Fang,Minghua Wang,Linghao He,Xiaozhong Feng,Jihong Zhao,Zhihong Zhang,Hongzhong Zhang
It is highly desirable and a popular topic in scientific research to develop a highly sensitive and selective detection and quantitative analysis method of determining trace silver ions (Ag + ) in aqueous media since Ag + ions are recognized as one of the most hazardous metal pollutants. Three-dimensional graphene oxide (3D-GO) was decorated with Fe 3 O 4 to form nanocomposites of Fe 3 O 4 @3D-GO, which were further used as electrode materials in an electrochemical DNA sensor for detecting Ag + . Because of the chemical functionality and porous structure of the developed nanocomposites, single-stranded and cytosine-rich oligonucleotides could be anchored onto their surfaces or interior, followed by selective detection of Ag + through formation of C–Ag + –C complex forms. The results of electrochemical measurement showed that the Fe 3 O 4 @3D-GO nanocomposites exhibits high sensitivity for detecting Ag + with a detection limit of 2.0 pM within the range of 0.01–100 nM Ag + (S/N = 3). The developed electrochemical biosensor based on Fe 3 O 4 @3D-GO exhibits highly selectivity, good repeatability, and stability for detecting Ag + ions. The results of this work demonstrate that Fe 3 O 4 @3D-GO nanocomposites could be used as a promising tool to detect heavy metal ions in water or the environment.
研究领域:
环境科学
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生物传感技术
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材料科学
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 18
·4336
·
IF 4.2
Yan Liao,Dashuang Wang,Wenrui Zhu,Zhilan Du,Fanbo Gong,Tuo Ping,Jinsong Rao,Yuxin Zhang,Xiaoying Liu
Transition metal oxides have been widely used in microwave-absorbing materials, but how to improve impedance matching is still an urgent problem. Therefore, we introduced urea as a polymer carbon source into a three-dimensional porous structure modified by Co3O4nanoparticles and explored the influence of different heat treatment temperatures on the wave absorption properties of the composite. The nanomaterials, when calcined at a temperature of 450 °C, exhibited excellent microwave absorption capabilities. Specifically, at an optimized thickness of 9 mm, they achieved a minimum reflection loss (RLmin) of −97.3 dB, accompanied by an effective absorption bandwidth (EAB) of 9.83 GHz that comprehensively covered both the S and Ku frequency bands. On the other hand, with a thickness of 3 mm, the RLminwas recorded as −17.9 dB, with an EAB of 5.53 GHz. This excellent performance is attributed to the multi-facial polarization and multiple reflections induced by the magnetic loss capability of Co3O4nanoparticles, the electrical conductivity of C, and the unique three-dimensional structure of diatomite. For the future development of bio-based microwave absorption, this work provides a methodology and strategy.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 60
·35189-35196
·
IF 3.049
Yi-Wei Cui,Hai-Huan Zhang,Shi-Yong Yu
Efficient C–ZnS/ZnMoO4@MoS2 and C–ZnS/MoS2 nanocomposite photocatalysts, using ZIF-8 derived C–ZnO as a precursor were successfully synthesized using a simple one-pot procedure. This is the first application that involves transforming ZIF-8 into C–ZnMoO4 for photocatalysis. The C–ZnS/ZnMoO4@MoS2 and C–ZnS/MoS2 heterostructures were characterized by X-ray diffraction, UV-vis, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, photocurrent measurements, scanning electron microscopy and transmission electron microscopy. The ZM2 sample of C–ZnS/ZnMoO4@MoS2 exhibited enhanced photocatalytic activity of about 2.9 times as high as that of ZIF-8 derived C–ZnO in the reduction of tetracycline hydrochloride, and also showed obvious photocatalytic activity 1.81 and 3.33 times as high as that of a ZM3 sample of C–ZnS/MoS2 and ZIF-8 derived C–ZnO in the degradation of RhB, respectively. The improved photodegradation activity is a result of the heterogenous structure and the tighter contact between C–ZnS and C–ZnMoO4 compared with the physical contact of general heterogenous photocatalysts. The C–ZnS/ZnMoO4@MoS2 heterostructure photocatalyst is expected to be a new type of nanomaterial for the degradation of pollutants from wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Yuling Li,Jiahui Bai,Kuofeng Tseng,Xiaoqiang Zhang,Li Zhang,Jing Zhang,Wenjian Sun,Yinlong Guo
Free unsaturated fatty acids (UFA) are key intermediates of lipid metabolism and participate in many metabolic pathways with specific biological functions. Although various fragmentation-based methods for pinpointing C═C locations in UFA were developed, the current mass spectrometry methods are difficult to simultaneously differentiate geometric isomers and positional isomers in trace samples due to low ionization efficiency, low conversion, and low resolution. Herein, an intramolecular ring–chain equilibrium elimination strategy via 4-plex stable isotope labeling dual derivatization-assisted ion mobility-mass spectrometry was developed, thereby one-pot specifically labeling C═C and carboxyl groups among the trace and unstable UFA with high sensitivity, high efficiency, and good substrate generality. It achieved fast separation of both C═C positional and geometric isomers with high resolution, which benefited from eliminating the intramolecular ring–chain equilibrium by suppressing the formation of salt bridges between free carboxyl groups and pyridine cations. 4-plex stable isotope labeling reagents showed similar reactivity, enabling high-throughput quantitative analysis of omics. This method was successfully applied for accurate and rapid identification of the UFA composition in olive oil extract. These results suggest that the developed method provides new insight for rapid characterization of UFA C═C positional and geometric isomers in complex samples to explore disease biomarkers and food quality control indicators.
研究领域:
分析化学
·
脂质组学
·
质谱分析
·
代谢组学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Mengyang Xu,Xiaoxue Zhao,Haopeng Jiang,Songtao Chen,Pengwei Huo
Converting carbon dioxide into valuable chemicals is seen as a promising strategy for slowing global warming while enriching energy supplies. Photocatalysts derived from Metal-Organic Frameworks (MOFs) can not only overcome the problem of poor stability of MOFs, but also inherit the advantages of MOFs to some extent. Herein, carbon doped In 2 O 3 (C-In 2 O 3 ) hollow tubular is synthesized by calcination of MIL-68(In) as sacrificial template. Then C-In 2 O 3 and g-C 3 N 4 are hydrothermal to obtain C-In 2 O 3 /g-C 3 N 4 heterojunction . The unique hollow tubular structure, carbon doping and type-II heterojunction of C-In 2 O 3 /g-C 3 N 4 expand the light absorption capacity and promote the separation of photogenerated electron-hole pairs, thus significantly improve the activity of photocatalytic reduction of CO 2 . Among them, C-In 2 O 3 /g-C 3 N 4 -5 shows the highest CO 2 reduction activity towards CO (153.42 μmol/g/h) and CH 4 (110.31 μmol/g/h).
研究领域:
材料科学
·
环境科学
✓ 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）