FUEL
·
2026
·
IF 7.8
Miao Ma,Min Yang,Cai-Yue Zhang,Hai-Yi Sun,Rong-Jing Su,Xiao-Rui Yue,Chen-Xi Li,Yong-Ming Chai,Bin Dong
Developing low-cost, high-performance Ru-based hydrogen evolution reaction (HER) catalysts is crucial for advancing anion exchange membrane water electrolysis (AEMWE) technology. In this study, based on the Sabatier principle, a Ru/CoMoO 4 heterojunction catalyst with a ternary “nanorod-macroparticle-microparticle” structure is designed. Benefiting from the strong electronic interactions, a lower d-band center of Ru/CoMoO 4 is observed, resulting in optimal adsorption between Ru species and the key H* intermediates to greatly enhance the hydrogen desorption kinetics. Importantly, this interface engineering effect prevents the Volmer-Tafel step from becoming rate-limiting step, thereby promoting electron and mass transport. As a consequence, Ru/CoMoO 4 outperforms most of the reported HER catalysts at an ultra-low Ru loading of only 0.2 wt%. In alkaline media, it only requires an overpotential of 55 mV to achieve 100 mA cm −2 , with a low Tafel slope of 16 mV dec -1 , and operates stably for over 230 h at an industrial-grade current density of 1000 mA cm -2 . The AEMWE electrolyzer based on the Ru/CoMoO 4 catalyst achieves efficient and stable hydrogen production at 1000 mA cm⁻ 2 @ 1.93 V. This work not only provides a high-performance catalyst, but also elucidates a strategy for precisely controlling d-band center through heterojunction interface engineering to optimize reaction [email protected]
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高影响因子
Journal of Molecular and Engineering Materials
·
2021
·
IF 0
Lili Feng,Pengyu Wang,Hansen Yang,Zhuo Chen,Shuhui Bo
A charge transfer dye with the D– π –A structure was synthesized by Pd catalyzed Hartwig–Buchwald coupling and Knoevenagel condensation reaction, using N, N-dihexylbenzo[b]thiophen-6-amine as donor and 2-(3-cyano-4, 5, 5-trimethylfuran-2 (5H)-ylidene)malononitrile (TCF) as acceptor. The solvatochromic and pH switch properties of the as-synthesized dye were investigated through UV-vis absorption and fluorescence emission spectra. A positive solvatochromism of the dye in different polar solvents was observed along with a visible color change of the solution. By adding acid/base into the DMSO solution of the dye, the color as well as the absorption and emission spectra of the solution exhibited outstanding characteristics of pH switch.
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PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2017
·
IF 0.809
Jin Luo,Anlin Zhao,Caihua Zheng,Tao Wang
GRAPHICAL Display full size
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高影响因子
Science China-Materials
·
2026
·
IF 7.7
Zhang Wen,Zhang Qiong,Zhang Ruixue,Liu Zhihao,Li Hongdong,Wu Zexing,Zhang Yang,Xu Guang-Rui,Wang Lei
The demand for Cl 2 is increasing globally, and the chlorine evolution from seawater is a promising technique in the chlor-alkali field to generate chlorine gas. Here, we constructed a novel hollow porous CoNiSe 2 /NiSe 2 nanosheet array for the electrosynthesis of chlorine in seawater-like solution. The CoNiSe 2 /NiSe 2 heterostructures were generated by ion exchange and calcination, which can improve their stability. Moreover, the formed porous hollow nanostructures show an ultra-high specific surface area due to the unique morphology and crystal structure, which can provide channels for mass transfer between the electrolyte and the surface of catalysts and expose more catalytically active sites for accelerating the reaction process. What is impressive is that the hybrid coupling of the Se 4p orbital and the Co/Ni 3d orbital in the heterointerface further reduces the reaction energy barrier of the chlorine evolution reaction (CER). The hollow porous CoNiSe 2 /NiSe 2 nanosheet arrays only exhibit an overpotential of 108 mV to reach the current density of 100 mA cm −2 in an acidic medium containing 4.0 M NaCl. Furthermore, the hollow porous CoNiSe 2 /NiSe 2 nanosheet arrays showed excellent stability and Cl 2 selectivity. The designed transition metal selenides provide a choice for the further development of non-noble metal-based catalysts in the chlor-alkali industry.
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高影响因子
CARBOHYDRATE RESEARCH
·
2023
·
IF 3.1
Kai Wang,Yunfei Xiao,Changchun Wu,Yimo Feng,Zhipeng Liu,Xi Zhu,Hongjun Zang
3-Acetylamino-5-acetylfuran (3A5AF) is an important nitrogen-containing fine chemical with broad application prospects and high research value. Herein, we report a novel method for the conversion of N-acetyl- d -glucosamine (NAG) to 3A5AF in the choline chloride-based deep eutectic solvents (DESs). The catalytic activities of various DESs have been smoothly screened, and DES 2 (choline chloride/PEG-200/boronic acid = 1/1/0.5) displayed the best catalytic performance. In the absence of any additional solvent, catalyst and additive, product 3A5AF was obtained in 18.3% yield after reacting at 180 °C for 15 min under atmospheric condition. In addition, DES 2 showed a good reusability. The possible reaction pathway was elucidated on the basis of the results of LC-MS and 13 C NMR spectra. This study provided a new perspective for the application of DES in the conversion of chitin biomass.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 21
·10062-10066
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IF 3.925
Yongrui He,Bing Zheng,Meiling Qi,Lijun Huo
This work reports the separation performance of a new π-conjugated copolymer (PBDB-T) with alternating electron-donor and electron-acceptor units as the stationary phase for capillary gas chromatography (GC). To date, they have not been explored in the field of chromatography. The PBDB-T column exhibited a column efficiency of 3850 plates m−1 determined by n-dodecane at 120 °C and high-resolution performance toward a wide range of aromatic isomers, particularly halobenzenes, phenols, anthracene and phenanthrene. Moreover, it showed excellent separation repeatability and reproducibility in terms of run-to-run, day-to-day and column-to-column and good thermal stability. This work demonstrates the good potential of the indicated D–A copolymer as a new class of stationary phase for chromatographic analyses.
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高影响因子
Polymer-Plastics Technology and Materials
·
2022
·
IF 2.439
Wenqiang Wang,Yiming Gong,Qingxia Huang,Liuzemu Li,Airong Xu,Rukuan Liu
Green polyvinyl alcohol/poly(D,L-lactide-co-glycolide) (PVA/PLGA) composite materials were developed by dissolving PVA and PLGA in hexafluoroisopropanol (HFIP), followed by the subsequent layout of PVA/PLGA/HFIP liquid film and the removal of HFIP. Interestingly, the PVA/PLGA composite materials display remarkedly enhanced tensile strength, elongation at break, biodegradability and biocompatibility. Systematic investigations have been completed to reveal the effects of PVA/PLGA mass ratio on the tensile strength, elongation at break, biodegradability and biocompatibility. Meanwhile, the morphology, crystallinity and chemical structure of the PVA/PLGA material and possible interaction between PVA and PLGA are also investigated using scanning electron micrograph, infrared spectra and X-ray diffraction techniques.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Li Lin,Liangen Shen,Junfeng Zhang,Yiyan Xu,Zheng Fang,Peter Müller-Buschbaum,Qi Zhong
Wearable solar radiation sensors based on ionic hydrogels are facilely prepared to simultaneously monitor the radiation dose for the production of vitamin D and the prevention of sunburn. Tetramethylethylenediamine (TEMED) is neutralized with acrylic acid (AA) to obtain tetramethylethylenediamine acrylate (TEMEDA), which is further polymerized with acrylamide by a free radical reaction. By simply adding MB or NR during the polymerization, the final obtained ionic hydrogels can indicate solar radiation. Due to the extent of discoloration, the discoloration speed of MB and NR is correlated to the radiation dose. This wearable sensor can indicate the solar radiation dose required by the human body to synthesize vitamin D through the discoloration of the ionized hydrogel of MB, whereas those with NR are able to illustrate the threshold of radiation dose that causes potential skin hurt. Therefore, the benefit and drawback of solar radiation can be well balanced by optimizing the exposure time to solar irradiation. In addition, polyurethane cross-linked with a thermoresponsive coating is used as band for this wearable sensor. Due to the hydrophilicity below its transition temperature, the cross-linked band possesses the easy cleaning capability of stains after the daily wear. Such type of wearable sensor can be broadly used for monitoring the solar radiation, especially in outdoor activities.
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 3
·2193-2205
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IF 5.693
Huang Yajing,Chen Songlin,Ma Ruitong,Cheng Yalin,Jin Lun,Chen Guohua
A novel method has been developed to synthesize fine coal-based carbon composite particles containing rich nitrogen-doped microcrystalline structure with superior electromagnetic-shielding (EMI) performances using anthracite as raw material for the first time. Carbon composite was observed after reacting with furanmethylamine (FMA), followed by ball-milling and a high-temperature (1000 °C) thermal anneal. Carbon structure was assessed before and after reacting FMA with X-ray diffraction (XRD), Raman, Fourier transform infrared spectroscopy (FT-IR), temperature-programmed oxidation (TPO), and X-ray photoelectron spectroscopy (XPS). All data are consistent with the occurrence of Diels–Alder (D-A) reaction, providing D-A reaction occurred between coal and FMA for the first time. Because the D-A reaction changes the three-dimensional structure of coal and weakens the cross-linking of the coal structure, ball-milling modified coal reduces the size of coal particles without deepening the disorder of coal, and heat treatment caused the reverse reaction of D-A reaction, which improved the structural integrity of the carbon networks. The final product called “Coal-FBT” shows a maximum attenuation of 62.2 dB, which qualifies as excellent electromagnetic shielding as 50wt% mixed with paraffin. Graphical abstract The modified coal (Coal-FBT) showed a max SE T of 62.2 dB, which is much higher than the pristine coal (8.81 dB).
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高影响因子
JOURNAL OF FOOD SCIENCE
·
2021
·Vol. 86
·期 6
·2434-2444
·
IF 3.167
Rehebati Nuerxiati,Paiheerding Mutailipu,Aytursun Abuduwaili,Jun Dou,Haji Akber Aisa,Abulimiti Yili
In this study, an enzyme-assisted extraction method was used to extract Orchis chusua D. Don (Salep) polysaccharide (SP), which was then modified by sulfation, acetylation, phosphorylation, and carboxymethylation to obtain modified polysaccharides. Furthermore, their degree of substitution, chemical composition, and molecular weight were evaluated. The primary structural features were characterized by UV spectra, FT-IR spectra, Congo-red test, and scanning electron microscope. The phosphorylated polysaccharide (SP-P) was demonstrated the highest scavenging ability on hydroxyl radical and growth-promoting activity on Lactobacillus Bulgaricus . The carboxymethylated polysaccharide (SP-C) was exhibited the strongest DPPH and ABTS radical scavenging effects. The acetylated polysaccharide (SP-A) displayed the best proliferation effects on Bifidobacterium adolescentis , whereas the sulfated polysaccharide (SP-S) maintained moderately stable antioxidant and probiotic ability. These findings indicate that the modified polysaccharides had their potential significance as new antioxidants and probiotics for the food industry. Practical Application This article provides a new source for the development of polysaccharide derivatives as new antioxidants and probiotics for the food industry.
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PubMed
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Jing Li,Kunpeng Gao,Francesco Secundo,Xiangzhao Mao
Chitin, one of the most abundant renewable biopolymers on Earth, is commercially available from crustacean wastes. One critical step in converting chitin to high-value products is its degradation by chitinolytic enzymes to N -acetyl- d -glucosamine (GlcNAc), which plays a significant role in functional food and pharmaceutical industries. Here, we cloned and biochemically characterized two novel β - N -acetylglucosaminidases named SvNag2557 (family-84) and SvNag4755 (family-3) from Streptomyces violascens ATCC 27968. Both SvNag2557 and SvNag4755 exhibited strict substrate specificity toward N -acetyl chitooligosaccharides with GlcNAc as the sole product. Thus, a one-pot production for pure GlcNAc from chitin by an enzyme cocktail reaction was further developed. Under the co-action of an endo-type chitinase SaChiA4 and SvNag2557 (mass ratio 1:2), the final conversion rates of colloidal chitin and ionic liquid pretreated chitin to GlcNAc were 80.2% and 73.8% with GlcNAc purities of 99.7% and 96.8%, respectively.
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PubMed
高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 1
·147-163
·
IF 2.014
Shao Jun,Xu Lanli,Pu Shouzhi,Hou Haoqing
Blending of poly( l -lactide) and poly( d -lactide) (PLLA, PDLA) results in the formation of poly(lactide) stereocomplex crystallites (SC). For the preparation method, numerous reports employed solution mixing and stirring to receive a product with uniform performance. However, the effect of stirring time during solution mixing on the subsequent crystallization behavior did not clear yet, and which is important for solution crystallization, casting and spinning. In this paper, linear PLLA and PDLA with various molecular weights were synthesized. The PLLA and PDLA solutions were mixed together and stirred for different times before casting. Results revealed that the structures of PLA SC and homochiral crystallites (HC) did not vary with change in the stirring time. More amount of content of SC with uniform structure and less amount of content of HC were produced in the specimens stirred for longer time. When the specimens crystallized either from the melt or from the melt-quenching, less amount of content of crystallites (total crystallinity of SC and HC) was produced and the melting temperature of SC and HC depressed in the specimens that were stirred for longer time. With the increase in molecular weights, the effect of stirring time on the crystallization behaviors declined. This investigation provides a route to tailor the crystallization behavior of PLLA/PDLA specimens.
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高影响因子
危险品化学品经营许可证（带存储）