JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Xiaofang Cao,Mingkai He,Baopeng Ma,Shixuan Liu,Xiaohui Pang,Mingzhen Song,Fudong Zhang,Xiaolian Chao,Zupei Yang,Di Wu
The band degeneracy thus thermoelectric performance of (Fe, Co)Sb 3 based p -type skutterudites can be well modulated by adjusting Co/Fe ratio. Combining systematic experiments and density function theory (DFT) calculations, we revealed in this work that the variation of Co/Fe ratio could result in complicated and mutually coupled effects on the individual thermoelectric parameters (band degeneracy, band gap, Fermi level , filling limit of fillers, phonon spectrum, etc.) and that using Co/Fe ratio to improve the overall thermoelectric figure of merit is nontrivial. We eventually found that the optimal Co/Fe ratio for Mm (Misch metal) filled (Fe, Co)Sb 3 lies at 1.3:2.7, which is somewhat off the Co/Fe = 1:3 point where the largest valence band degeneracy appears. Extra Sb was then introduced to compensate Sb volatilization for improved electrical transport performance. An overall peak figure of merit ZT max of 1.06 was eventually achieved in the sample Mm 0.8 Fe 2.7 Co 1.3 Sb 12.60 , which is among the highest ones for all reported (Fe, Co)Sb 3 based p -type skutterudites so far.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Jiaojiao Xie,Xinyu Zhi,Bowen Lu,Dikun Hong,Liqi Zhang
NiFe 2 O 4 has been widely applied in CO 2 hydrogenation for its excellent redox properties. However, NiFe 2 O 4 samples usually exhibited complex performance, rapid inactivation followed by slow activation, and poor hydrogenation selectivity. In this work, the complex behavior of NiFe 2 O 4 in CO 2 hydrogenation was studied, and the influence of surface oxide species(NiO and Fe 2 O 3 ) on its catalytic performance was probed on NiFe 2 O 4 -ww through magnetic water washing. NiFe 2 O 4 -ww was observed to predominantly produce CO with nearly 100% selectivity at lower temperatures and demonstrated a higher CO 2 conversion rate of 71.90% at 700 °C. However, under high-temperature reducing conditions, NiFe 2 O 4 -ww underwent rapid reduction to form Fe Ni alloy, which induced sintering and carbon deposition, thereby leading to a significant decline in catalytic activity. Surface NiO species on NiFe 2 O 4 enhanced CO 2 hydrogenation at lower temperatures but reduced the selectivity towards CO. Surface Fe 2 O 3 species enhanced the catalytic resistance to reduction, thereby improving catalyst stability by inhibiting the accumulation of carbon deposition. The effect of residual oxides on the NiFe 2 O 4 surface may give insight into understanding the deactivation behavior of Fe Ni alloy in CO 2 hydrogenation.
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Nature Communications
·
2026
·
IF 18.1
Tu Weilin,Chu Mingyu,Yan Tianran,Zhang Qingqing,Wang Xianpeng,Zhang Liang,Cao Muhan,Zhang Qiao,Zhu Mingshan,Zhan Mingxiu,Chen Jinxing
The compositional heterogeneity of post-consumer plastic waste, exemplified by prevalent polyethylene (PE)/polypropylene (PP) mixtures (>50% of the plastic market), severely complicates recycling. Kinetic disparities between PE and PP during chemical recycling create significant conversion gradients, limiting valued product yield and process viability. Here, leveraging strong interfacial coupling between ruthenium oxides and rutile TiO 2 , we construct highly active, epitaxial RuO x sites enabling efficient one-pot co-conversion of PE/PP mixtures with a high liquid yield of 95.02%, while maintaining a low 0.62% gas yield. Compared to conventional Ru nanoparticles, the epitaxial RuO x structure provides additional dehydrogenation sites for PP activation, which promotes carbon–metal back-donation to weaken C–C bonds, thus exhibiting comparable activation capabilities toward both 3 C– 2 C bond in PP and 2 C– 2 C bond in PE. This unique epitaxial catalyst enables highly efficient co-hydrogenolysis of mixed polyolefins, establishing a practical approach for their upcycling.
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ChemElectroChem
·
2025
·
IF 3.5
Wenzhi Teng,Yuhang Wang
Graphical This study fills the CO electrolysis performance gap caused by electrolyzer scaling using the toolkit of electrode reinforcement, flow rate optimization, and heat management. This approach produces a 580-W electrolyzer stack with multicarbon product Faradaic efficiency of ~80 %. The industrial-scale implementation of carbon monoxide (CO) electrolysis provides a sustainable route to renewable fuels and chemicals. However, scaling up the process faces the challenge of maintaining high Faradaic efficiencies (FEs) and current densities. Here, we address this issue by reinforcing the gas diffusion layer (GDL), optimizing the CO flow rate, and improving heat management. These allow us to fill the performance gap between different electrolyzer stacks from 5 cm 2 to 3×50 cm 2 . Across this scale range, we report FEs of ~80 % for multicarbon (C 2+ ) products at 500 mA cm −2 , and the peak power reaches 580 W, 80 times that of the 5 cm 2 electrolyzer. This work provides practical guides for developing CO electrolysis from bench science to industrial chemical production technology.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 17
·8171-8194
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IF 11.301
Yuanzhi Li,Shaowen Wu,Jichun Wu,Qianqian Hu,Chongyang Zhou
CO and volatile organic compounds (VOCs) as main air pollutants are discharged in large quantities from various industrial processes. They are not only hazardous to human health, but also harmful to the air environment. Currently, catalytic combustion using supported noble metal catalysts is commercially used for the abatement of air pollutants in various industrial processes due to high catalytic efficiency and long-term durability. The major challenge for catalytic combustion is large energy consumption. Photocatalytic oxidation provides a low energy consumption approach as it utilizes inexhaustible solar energy. The major challenges for photocatalytic oxidation are low catalytic efficiency and prone deactivation. Photothermocatalytic oxidation provides a very promising approach for the abatement of air pollutants. It perfectly combines the advantages of catalytic combustion and photocatalytic oxidation. Photothermocatalytic abatement of air pollutants follows a mechanism of light-driven thermocatalytic oxidation, which is considerably enhanced by a novel photoactivation that is completely different from photocatalysis on semiconductor photocatalysts. This review will discuss the light-driven thermocatalytic oxidation mechanism and the novel photoactivation, and summarize several strategies of designing efficient photothermocatalysts such as nanostructured transition metal oxides, supported noble metal catalysts, nanocomposites of transition metal oxides and semiconductor photocatalysts, and so on.
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Nuclear Materials and Energy
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2020
·
IF 2.213
S.A. Krat,A.S. Prishvitsyn,Ya.A. Vasina,Yu.M. Gasparyan,A.A. Pisarev
An improved diffusion based model for prediction of the hydrogen content in co-deposited layers depending on the deposition conditions (the properties of the material which is co-deposited with hydrogen, rate of deposition, hydrogen flux and particle energy, substrate temperature) is presented. The model is validated using experimental data for W, Mo and Al, and is compared to empirical scaling equations currently in use. It is shown that a good agreement is observed in regards to hydrogen content vs substrate temperature experimental data, and no disagreement with scaling equations can be seen in regards to the role of hydrogen flux and the rate of deposition. It is shown that the influence of hydrogen particle energy on the hydrogen content requires further investigation. In addition to hydrogen, models for other mobile impurities both in co-deposited layers and in layers under steady-state net erosion conditions are given.
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Penghui Chen,Qiang Liu,Yagang Feng,Xiaoying Li,Xiaopu Chen,Yumin Liu,Jiang Li
Y 0.16 Zr 0.84 O 1.92 transparent ceramics were successfully fabricated by air pre-sintering combined with HIP post-treatment from the nanopowder synthesized by the co-precipitation method. Fine and low-agglomerated Y 0.16 Zr 0.84 O 1.92 powder with the average particle size of 14.8 nm was obtained by calcining the precursor at 800 °C for 4 h. The influences of pre-sintering temperature on the microstructure and optical quality of Y 0.16 Zr 0.84 O 1.92 ceramics were investigated. It is found that the relative density of pre-sintered Y 0.16 Zr 0.84 O 1.92 ceramics increases from 82.1% to 96.1% and the average grain size increases from 0.6 μm to 6.0 μm with the pre-sintering temperature increasing from 1250 °C to 1500 °C. The Y 0.16 Zr 0.84 O 1.92 ceramic sample pre-sintered at 1300 °C for 2 h and HIP post-treated at 1800 °C for 3 h without sintering additives exhibits the best transparency. In-line transmittance of Y 0.16 Zr 0.84 O 1.92 ceramics with the thickness of 1.0 mm reaches 72.4% at 800 nm, which is near to the theoretical transmittance.
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CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Si-Ming Wu,Nan Jiang,Zhi-Yi Hu,Tao Yan,Jun Jin,Wei Geng,Xiao-Yu Yang
Core-shell structured [email protected] @meso-Silica nanoparticles have been synthesized via a layer-by-layer approach. The magnetic cobalt core makes the nanoparticles easy to separate with an external magnetic field. The inner dense silica layer prevents the Co from oxidation and leaching. The outer mesoporous silica presents high surface area and pore volume, endowing the material with superior adsorption properties of organic molecules. The core-shell structure prevents the direct contact of cobalt with living cells, thus enhancing the biocompatibility remarkably. This dual encapsulation provides a golden opportunity to the nanocarrier design with easy magnetic separation, high drug loading, and high biocompatibility.
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Materials
·
2014
·Vol. 7
·期 12
·8105-8130
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IF 1.879
Xiaoshuang Qian,Hongmei Qin,Tao Meng,Yi Lin,Zhen Ma
Oxides (such as SiO2, TiO2, ZrO2, Al2O3, Fe2O3, CeO2) have often been used to prepare supported Pt catalysts for CO oxidation and other reactions, whereas metal phosphate-supported Pt catalysts for CO oxidation were rarely reported. Metal phosphates are a family of metal salts with high thermal stability and acid-base properties. Hydroxyapatite (Ca10(PO4)6(OH)2, denoted as Ca-P-O here) also has rich hydroxyls. Here we report a series of metal phosphate-supported Pt (Pt/M-P-O, M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts for CO oxidation. Pt/Ca-P-O shows the highest activity. Relevant characterization was conducted using N2adsorption-desorption, inductively coupled plasma (ICP) atomic emission spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), CO2temperature-programmed desorption (CO2-TPD), X-ray photoelectron spectroscopy (XPS), and H2temperature-programmed reduction (H2-TPR). This work furnishes a new catalyst system for CO oxidation and other possible reactions.Keywords:metal phosphate;hydroxyapatite;Pt catalyst;CO oxidation
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PubMed
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CRYSTENGCOMM
·
2014
·Vol. 16
·期 30
·6996-7003
·
IF 3.858
Jian-Rong Wang,Chanjuan Ye,Xuefeng Mei
Crystal engineering principles were employed in designing new co-crystals of hydrochlorothiazide (HCT). A variety of potential co-crystal formers were initially identified in a search of the Cambridge Structural Database with complementary hydrogen-bonding functionalities. Subsequent co-crystallization screening monitored by powder X-ray diffraction led to the discovery of new crystalline phases of HCT with pyrazinamide (1), 4,4′-bipyridine (2), 1,2-bis(4-pyridyl)ethane (3), and trans-1,2-bis(4-pyridyl)ethylene (4). All of the resulting co-crystals were thoroughly characterized by X-ray diffraction, FT-IR and Raman spectroscopy, and thermal analysis. Noticeably, the co-crystal 1 involves the formation of drug–drug co-crystals of HCT and pyrazinamide, which makes it a potential candidate for development of HCT formulations for combinational therapy.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2017
·
IF 1.174
Yulin Wang,Huan Liu,Zhen Ma
LaPO 4 and hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) are typical metal phosphates recently found to be useful for making supported metal or metal oxide catalysts, but CePO 4 (also belonging to the metal phosphate family) has been rarely used to make supported catalysts. It would be interesting to develop CePO 4 -supported catalysts and explore their catalytic applications. Herein, hexagonal CePO 4 nanorods (denoted as CePO 4 -H), hexagonal CePO 4 nanowires (CePO 4 -HNW), monoclinic CePO 4 nanoparticles (CePO 4 -M), and monoclinic CePO 4 nanowires (CePO 4 -MNW) prepared by different methods were used to support gold via deposition-precipitation with urea (DPU). The gold contents of these catalysts were all around 1 wt%. The catalytic activities of these Au/CePO 4 catalysts in CO oxidation were found to follow the sequence of Au/CePO 4 -MNW > Au/CePO 4 -HNW > Au/CePO 4 -M > Au/CePO 4 -H. These catalysts were characterized by inductively coupled plasma-optical emission spectroscopy (ICP-OES), N 2 adsorption–desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), oxygen temperature-programmed desorption (O 2 -TPD), and CO 2 temperature-programmed desorption (CO 2 -TPD) to find possible correlations between the physicochemical properties and catalytic activities of these catalysts.
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Crystals
·
2025
·Vol. 15
·期 9
·752
·
IF 2.4
Haifeng Luo,Yuchen Zheng,Shizhao Ren,Wangchuan Xiao,Rongrong Xue,Wei Han,Fenghua Chen
Andrographolide (ADG) is a typical poorly water-soluble drug, and a co-amorphous strategy was used here to improve its aqueous solubility. Co-amorphous systems of ADG and amino acids with a 1:1 molar ratio were screened via the neat ball milling method. L-lysine (Lys) and L-tryptophan (Trp) can be used as co-formers with ADG, forming a co-amorphous phase, which was confirmed by powder X-ray diffraction, IR and Raman spectroscopy. ADG-Trp showed poor solubility at 37 °C, which was close to that of raw ADG (0.08 mg·mL−1). ADG-Lys showed unexpectedly enhanced solubility, at 0.5 mg·mL−1in the media of water and PBS (pH 7.4) and 0.3 mg·mL−1in the medium of HCl buffer (pH 1.2) at 37 °C. ADG-Lys showed good storage stability for 5 months, but its thermal stability was poor and it could recrystallize at 100 °C. Compared with ADG-Trp, ADG-Lys has weaker hydrogen bonding interactions and stronger hydrophobic interactions related to ADG molecules, which might cause the unusual enhancement in solubility. To our knowledge, ADG-Lys prepared in this work shows the maximum ADG content (70 wt.%) and the highest ADG solubility among the reported ADG amorphous solid dispersions and co-amorphous systems.
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