MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Yang Ren,Haiyan He,Yunwei Wang,Ying Gong,Gaoyang Zhao
In this study, the F–Nb co-doped TiO 2 films (TFNO) were prepared on soda lime glass using the sol-gel method. Multielement doping was carried out to further improve the conductivity of Nb-doped TiO 2 (TNO) thin films by increasing the carrier concentration. The effect of fluorine doping on the microstructure, chemical composition, and optoelectronic properties of the TFNO films was investigated. The results show that the obtained films are polycrystalline with an anatase structure. Both niobium and fluorine are present in the TiO 2 films (as Nb 5+ and F − ). With increasing fluorine doping, the visible-light transmittance of the film increases slightly, and the carrier concentration continues to increase until saturation. However, the carrier mobility decreases gradually. The TFNO film exhibits the optimal optoelectronic properties, when the F:Ti atomic ratio is 0.5:1, reaching a resistivity of 0.02 Ω cm and a visible-light transmittance of 81%.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2020
·Vol. 37
·期 12
·2143-2151
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IF 2.69
Shi Guangyu,Wang Yuanhao,Cao Yafeng,Cai Weijie,Tan Fengzhi
A Ni/Ce 0.8 Zr 0.2 O 2 catalyst (NiCeZr-N) was synthesized by a facile co-nanocasting technique for syngas production from ethanol dry reforming. In addition, a series of characterization techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), inductive coupled plasma Emission Spectrometer (ICP), X-ray photoelectron spectroscopy (XPS), Raman and hydrogen temperature programmed reduction (H 2 -TPR) were selected to evaluate the physicochemical features of the as-prepared catalysts. Indeed, the results indicated that NiCeZr-N catalyst prepared by co-nanocasting method had a smaller particle size (<5 nm), relatively higher specific surface area (39 m 2 /g) and stronger metal-support interaction in comparison with another model catalyst obtained from conventional co-precipitation method (NiCeZr-P). Expectedly, these positive factors enabled NiCeZr-N catalyst to exhibit better activity and stability. Typically, ethanol is completely converted by using NiCeZr-N as catalyst and heating to 700 °C, and CO 2 conversion was as high as 65.3%. Interestingly, H 2 /CO was close to 1.1 at 650 °C, which could be used as feedstocks of Fischer-Tropsch process. Particularly, no obvious fluctuation of ethanol conversion and the product selectivity was observed during 40 h time-on-stream stability test.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2020
·Vol. 52
·期 1
·314-321
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IF 2.035
Ren Guoxing,Xiao Songwen,Xia Longgong,Liao Caibin,Liu Zhihong
To obtain fundamental information on the dissolution of cobalt into alumina-saturated MnO-SiO 2 -Al 2 O 3 slags in the smelting reduction of spent lithium-ion batteries, the equilibrium distribution of cobalt between Co-Cu alloys and alumina-saturated MnO-SiO 2 -Al 2 O 3 slags was measured at 1573 K and 1623 K under a controlled CO-CO 2 atmosphere. The results show that (i) the solubility of cobalt in the slag increased with increasing concentration of cobalt in the alloy and increasing oxygen partial pressure in the atmosphere at a fixed concentration of cobalt in the alloy, and (ii) the activity coefficient of CoO in the slag increased with increasing cobalt oxide in the slag. The activity coefficient of CoO in the slag, γ CoO, referred to as solid CoO, can be described as a function of the concentration of CoO in slag as follows: γ CoO = 11.2957(wt pct CoO in slag) + 12.0944 (1573 K, (wt pct MnO)/(wt pct SiO 2 )= 0.76–0.83); γ CoO = 2.2286(wt pct CoO in slag) + 4.5232 (1623 K, (wt pct MnO)/(wt pct SiO 2 )= 0.78–0.85).
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Expert Opinion on Drug Delivery
·
2020
·
IF 4.838
Pu Guo,Chao Pi,Shijie Zhao,Shaozhi Fu,Hongru Yang,Xiaoli Zheng,Xiaomei Zhang,Ling Zhao,Yumeng Wei
Background A novel nanoemulsion (CU/FU-LN) was developed as an oral 5-fluorouracil and curcumin co-delivery system for synergistic efficacy against liver cancer.Methods MTT assay, confocal laser scanning microscope, and H&E staining were utilized to establish the efficacy and safety of CU/FU-LN.Results The AUC(0-t) of CU/FU-LN was 8.85-fold and 8.59-fold greater than those of CU and FU, respectively. The IC50 of CU/FU-LN was 4.6-fold and 4.9-fold lower than those of FU and CU in HepG2 cells, respectively. In vivo anti-tumor trials, the tumor inhibition rate was significantly elevated by CU/FU-LN (49.29%), compared 24.84% and 4.72% for FU and CU, respectively. Ki-67 immunohistochemical analysis revealed that CU/FU-LN had an obvious anti-proliferation effect. The IC50 of CU/FU-LN in L02 cells was 1.51-fold and 2.60-fold higher than those of CU and FU, respectively. Certain vital organs in the mice of the CU/FU-LN group showed markedly fewer lesions than those of the CU, FU, and CU+FU groups. The CU/FU-LN treatment caused no significant change in mouse body weight relative to the control group (P > 0.05). Conclusions We successfully prepared a promising co-delivery platform for the synergistic treatment of liver cancer and it has a comparatively enhanced efficacy and mitigated toxicity.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yikai Lu,Zixuan Li,Yanling Xu,Linqian Tang,Shengjie Xu,Di Li,Jianjun Zhu,Deli Jiang
Developing non-precious metal electrocatalysts with high activity and stability are of great significance to achieve overall water splitting. In this work, cobalt-molybdenum nitride nanosheet arrays grown on Ni foam (CoMoN x NSAs/NF) were prepared via a facile hydrothermal and nitridation process. The resulting CoMoN x NSAs/NF not only has a specific large surface area and provides more active sites but also possesses good electrical conductivity, contributing to the fast reaction kinetics. Furthermore, the synergistic effect between Co 2 N and Mo 2 N cooperatively enhance the charge transfer, thus further improving the electrocatalytic activity. Benefiting from these merits, the optimal CoMoN x -500 NSAs/NF exhibits excellent activities for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with overpotentials of 91 and 231 mV at the current density of 10 mA cm −2 , respectively. Moreover, the CoMoN x -500 NSAs/NF||CoMoN x -500 NSAs/NF couple requires a low cell voltage of 1.55 V at the current density of 10 mA cm −2 , which is much superior to many other reported transition metal nitrides catalysts. This present work provides a reference for the design of bimetallic nitrides with superior electrocatalytic performance for overall water splitting.
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RSC Advances
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2020
·Vol. 10
·期 71
·43599-43606
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IF 3.119
Xiaomeng Dou,Wenzhi Li,Chaofeng Zhu,Xiao Jiang,Hou-min Chang,Hasan Jameel
Efficient cleavage of aryl–ether linkages is a key strategy for generating aromatic chemicals and fuels from lignin. Currently, a popular method to depolymerize native/technical lignin employs a combination of Lewis acid and hydrogenation metal. However, a clear mechanistic understanding of the process is lacking. Thus, a more thorough understanding of the mechanism of lignin depolymerization in this system is essential. Herein, we propose a detailed mechanistic study conducted with lignin model compounds (LMC) via a synergistic Co–Zn/Off-Al H-beta catalyst that mirrors the hydrogenolysis process of lignin. The results suggest that the main reaction paths for the phenolic dimers exhibiting α-O-4 and β-O-4 ether linkages are the cleavage of aryl–ether linkages. Particularly, the conversion was readily completed using a Co–Zn/Off-Al H-beta catalyst, but 40% of α-O-4 was converted and β-O-4 did not react in the absence of a catalyst under the same conditions. In addition, it was found that the presence of hydroxyl groups on the side chain, commonly found in native lignin, greatly promotes the cleavage of aryl–ether linkages activated by Zn Lewis acid, which was attributed to the adsorption between Zn and the hydroxyl group. Followed by the cobalt catalyzed hydrogenation reaction, the phenolic dimers are degraded into monomers that maintain aromaticity.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Wenhui Fang,Jing Wang,Ye Hu,Xiaoqing Cui,Ruifeng Zhu,Yuhua Zhang,Chaochao Yue,Jiaqi Dang,Wei Cui,Hong Zhao,Zengxi Li
It's a major challenge to explore highly active and stable electrocatalysts for efficient hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). In this work, we report a new hybrid electrocatalyst: iron-cobalt decorated nitrogen doped carbon/reduced graphene oxide-700 °C (Fe-Co-CN/rGO-700). The catalyst shows an excellent electrocatalytic performance toward HER and OER in alkaline solution, which has lower overpotentials of 0.215 V and 0.308 V at the current density 10 mA cm −2 , respectively, and this catalyst has an outstanding durability (after 45 h). The excellent activity mainly benefit from the highly dispersed iron/cobalt species, sheet structure with high porosity, the improvement of electronic structures with nitrogen-doped carbon and high conductivity of rGO. Combined with the density function theory (DFT) calculations, the improvement of the HER and OER performance were also attributed to the balance of adsorption/desorption of the hydrogen and oxygen-containing intermediates, and the increased electronic states density near the Fermi level. The proposed work provides a novel and simple strategy to synthesize a porous carbon electrocatalyst material using metal-organic frameworks (MOFs) as precursor with high activity and strong stability for HER and OER.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2020
·Vol. 326
·期 3
·1867-1877
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IF 1.137
Xie Xiaoqing,Wang Yanfei,Xiong Zeng,Li Hongzheng,Yao Chen
Poly(cyclotriphosphazene- co -polyethyleneimine) microspheres with the solid structure were synthesized by precipitation polymerization method for the separation of highly toxic uranium(VI). The structure and morphology of the prepared microspheres were analyzed via FTIR, SEM–EDS, TEM and BET. The optimal adsorption conditions were also investigated, and the maximum adsorption capacity was 274.2 mg g −1 . The experimental results showed that the adsorption kinetics conformed to the pseudo-second-order kinetics and was in good agreement with the Langmuir adsorption isotherm model. Removal of uranium(VI) ions was achieved by the complexation between the amino groups on the adsorbent and uranyl ions.
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 23
·8086-8093
·
IF 5.721
Haoxi Jiang,Debin Kong,Ying Niu,Sheng Wang
MnO2–CoOX catalysts with different Mn/Co ratios were prepared using polyvinyl pyrrolidone (PVP) as an assistant to control the morphology and exposed crystal faces of composite oxides. The physicochemical properties of the catalysts were systematically characterized and the catalytic activity of NH3-SCR and resistance to SO2/H2O were investigated. It was found that the NO conversion over Mn–Co-0.2-PVP was apparently higher compared with that over Mn–Co-X-PVP (X = 0.9, 0.8, 0.6, and 0.4). This can be interpreted in terms of exposed crystal surface (110) and enhanced adsorption of NH3/NO, and better redox performance resulting from higher Co3+/Co2+ ratio. Furthermore, different PVP and HAc additives have different H2O and SO2 resistance. Mn–Co-0.2-PVP showed good resistance to H2O and SO2 poisoning owing to having more low-temperature (∼200 °C) NO adsorption sites, which are beneficial to promote the de-NOX reaction and less affected by SO2.
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CRYSTENGCOMM
·
2020
·Vol. 23
·期 4
·884-891
·
IF 3.117
Changle Wang,Lipeng Zhang,Ping Yang
Transition-metal phosphides have been identified as effective materials for improving electrocatalytic hydrogen evolution. In this study, Ni2P, Co2P, and NiCoP yolk–shell structures were embedded in N- and P-doped carbon nanofibers (NPNFs) by controlling the heat-treatment procedure of the fiber precursors. The hydrogen evolution reaction (HER) activity of the samples was tested. The formation process of phosphides introduced a large number of surface defects that act as active sites to improve H2 evolution. NPNF embedding composite NiCoP particles exhibited better performance compared with Ni2P–NPNFs and Co2P–NPNF samples in acidic conditions. In the case of a molar ratio Ni : Co : P of 1 : 1 : 1, NiCoP-decorated NPNFs revealed the best HER performance, which is ascribed to the loading of NiCoP composite particles, which greatly increased the specific surface area. NiCoP–NPNFs exhibited overpotentials of 183 and 280 mV at current densities of 1 mA cm−2 and 10 mA cm−2, respectively, with a Tafel slope of 94.5 mV dec−1.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 32
·期 1
·1061-1072
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IF 2.22
Wang Yan,Di Xiaochuang,Lu Zhao
Lightweight absorbers with strong broadband microwave absorption are highly desired in military and civil fields. In this work, a 3D interpenetrating network formed from a Co@C@ MWCNTs composite was synthesized via a combined wet chemical and pyrolysis route. Because of strengthening interfacial polarization, suitable impedance matching and synergistic effects, the Co@C@MWCNTs hierarchical composite exhibited outstanding microwave absorption properties. An optimal reflection loss reached − 55.7 dB at 8.7 GHz and its effective bandwidth ( R L < − 10 dB) achieved 4 GHz (7.4–11.4 GHz) at an absorber thickness of 3 mm with a low filler content of 10 wt%. Furthermore, an effective bandwidth of 12.4 GHz (4.5–16.9 GHz) was obtained by varying the thickness from 2 to 4.5 mm. The superior microwave absorption performance originated from the enhanced interfacial polarization, multiple reflections, conductive network, synergistic effects and an improved impedance matching between Co–C and MWCNTs. This work provides a strategy to rationally design novel lightweight absorbers with strong microwave absorption.
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Green Energy & Environment
·
2020
·
IF 6.395
Chen Xing,Daihui Yang,Yan Zhang,Tian Sun,Junfei Duan,Hussein A. Younus,Shiguo Zhang
Heteroatom-doped meso/micro-porous carbon materials are conventionally produced by harsh carbonization under an inert atmosphere involving specific precursors, hard/soft templates, and heteroatom-containing agents. Herein, we report a facile synthesis of N and O co-doped meso/micro-porous carbon (NOMC) by template-free carbonization of a small-molecule precursor in a semi-closed system. The semi-closed carbonizaiton process yields hydrophilic NOMCs with large surface area in a high yield. The porous structure as well as the elemental composition of NOMCs can be modulated by changing the holding time at a particular temperature. NOMCs as metal-free heterogeneous catalysts can selectively oxidize benzyl alcohol and its derivatives into aldehydes/ketones with > 85% conversion in aqueous solution, which is much higher than that of the control sample obtained in tube furnace (21% conversion), mainly due to their high N content, high percentage of pyridinic N, and large surface area. The presence of O-containing moieties also helps to improve the hydrophilicity and dispersion ability of catalysts and thus facilitates the mass transfer process during aqueous oxidation. The NOMC catalysts also dispayed excellent activity for a wide range of substrates with a selectivity of > 99%.
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