JOURNAL OF CATALYSIS
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2020
·
IF 7.888
Yingchun Guo,Lei Feng,Changcheng Wu,Xiaomei Wang,Xu Zhang
Rational design and fabrication of metal–organic framework (MOF)-derived ordered hierarchical macro-/meso-/microporous N-doped carbon materials featured with the atomically dispersed metal atoms can effectively enhance their catalytic performance. Herein we develop a template-assisted strategy, namely the confined growth and pyrolysis of single-crystalline zeolite imidazolate framework-8 (ZIF-8) in three-dimensional ordered template voids, to create hierarchical porosity in MOFs-derived N-doped carbon materials. The as-synthesized single-atom Zn on N-doped hierarchically ordered porous carbon polyhedrons (Zn-N-HOPCPs) show integrated Lewis acid (single-atom Zn) and base sites (pyridinic N), high surface area (1128 m 2 ·g −1 ), large pore volume (0.90 cm 3 ·g −1 ), periodically interconnected open windows (~55 nm), highly accessible micro/mesopore channels (0.55, 0.8, 1.2, and 4 nm), and abundant Zn content (5.8 wt%). The hierarchical nanoarchitecture (macro-/meso-/micropores) significantly facilitates mass transfer for bulky-molecule-involved reactions and exposes inside active sites, resulting in satisfactory CO 2 photoconversion under mild conditions. The strategy presented here sheds light on the design and fabrication of various hierarchically ordered porous carbon decorated with atomically dispersed metal atoms for other important applications.
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高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Ting Chen,Yanqiao Xu,Zhixiang Xie,Lianjun Wang,Weihui Jiang,Wan Jiang
I–III–VI quantum dots (QDs), as a new class of light-emitting materials, have aroused a great of attention for an impressive variety of applications. A facile one-pot approach was employed to synthesize highly luminescent Cu–In–Zn–S/ZnS (CIZS/ZnS) core/shell QDs. It was found that the CIZS/ZnS QDs prepared using sodium sulfide as sulfur source exhibited the strongest emission due to its highest chemical reactivity as compared to thiourea and thioacetamide. The combination of GSH content and pH value played a crucial role in the growth of ZnS shell, which was responsible for the bright emission of QDs. The surface defects of QDs could be effective passivated by GSH, which exhibited a significant improvement of emission intensity. The optimum pH value of 7 was also established due to the fact that the deprotonized sulfhydryl group of GSH molecule strongly coordinated with Zn 2+ at neutral pH value. Moreover, the particle size and composition of the CIZS/ZnS QDs can be well adjusted by tuning the n Zn / n CuInZn ratios. The maximum quantum yield (QY) of CIZS/ZnS QDs increased from 5.95% to 26.12%, accompanying by the improvement of the radiative decay rate from 1.90 × 10 5 to 5.64 × 10 5 s −1 . Furthermore, a blue LED-pumped white light-emitting diode (WLED) device was realized by combining yellow-orange CIZS/ZnS QDs with green Lu 3 Al 5 O 12 :Ce 3+ phosphor, achieving a luminous efficacy (LE) of 66.9 lm/W, and color rendering index (CRI) of 87.2, which demonstrated their great application potential in solid-state lighting field.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Jianpeng Li,Xianfeng Li,Hongyan Chen,Dingshu Xiao,Jiajia Li,Dekang Xu
In this paper, we present a facile and one-step way for synthesizing Fe, N dual doped highly porous graphitic biomass carbon (FeNC) by using K 2 FeO 4 to fulfill the activated process and catalytic graphitization of straws. The FeNC demonstrates hierarchically porous structure with large surface area of 1034 m 2 g −1 , Fe, N dual doping with certain amount of Fe-N x , and graphitic structure. With these favorable features, the electrocatalytic activity for oxygen reduction reaction (ORR) reveals that the FeNC exhibits positively onset potential with highly comparable limiting current density when comparing with the sample using conventional KOH activated agent. In additional, the assembled Zn-air battery using FeNC as air-cathode catalyst delivers a maximal power density of 128.4 mW cm −2 . Considering the abundance of straws on the earth and the low-cost and green prepared process, the present FeNC materials are highly promising in application in ORR catalysts for Zn-air battery and other energy-related fields.
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高影响因子
APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Yinying Sheng,Junjie Yang,Ruiqing Hou,Lianxi Chen,Jiesheng Xu,Hui Liu,Xueyan Zhao,Xiaojian Wang,Rong Zeng,Wei Li,Yimin (Mike) Xie
With the purpose of regulating corrosion behavior and improving the biocompatibility of Zn-1 Mg alloy, we developed a phosphorylcholine chitosan (PCCs) coating forming a bionic cell membrane surface, using a silane conversion layer (APTEs) as the connection layer. Atomic force microscopy (AFM), contact angle (CA), and nano-scratch tests were conducted to study the surface roughness, the hydrophilicity and the adhesion strength of the PCCs layer. Bonding details were investigated by X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). Electrochemical impedance spectroscopy (EIS) tests were performed in simulated body fluid (SBF) at 37 °C to understand the degradation behavior in vitro . The experimental results demonstrated that the PCCs coating remarkably increased resistance against corrosion attack, with approximately 2 order higher value of the film resistance (R f ) than that of the substrate. Simultaneously, the PCCs-modified surface exhibited improved blood compatibility, anti-platelet adhesion, and significantly enhanced cyto-compatibility for human vascular endothelium cells (HUVECs). These results relates to the decreased release of Zn 2+ and the considerably enhanced surface hydrophilicity. PCCs coated Zn alloys presented in this work are indeed showing the promise for future application in biodegradable vascular stent.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
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2020
·Vol. 34
·期 7
·e5518
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IF 3.14
Bin Zhu,Ziao Zong,Xia Zhang,Dongmei Zhang,Liansheng Cui,Caifeng Bi,Yuhua Fan
Tetracycline (TC) is one of the most widely used antibiotics in aquaculture, and its good water solubility makes it a major contaminant in seawater. Therefore, it is very necessary and challenging to develop an efficient detection method. In this work, two novel metal–organic frameworks [Zn (bpydb)(bimmb) 0.5 ] n ( 1 ), {[Zn 2 (bpydb) 2 (bimb)]·[Zn (bpydb)(bimb)]·H 2 O} n ( 2 ), (bimb = 1,4-bis (lmidazol) butane, H 2 bypdb = 4,4′-(4,4’-Bipyridine-2,6-diyl)dibenzoic acid, bimmb = 1,4-bis (imidazol-1-ylmethyl)benzene) were successfully synthesized under solvothermal conditions. Zn-MOF 1 – 2 were characterized by X-ray powder diffraction (PXRD), Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). As expected, 1 – 2 have excellent fluorescence properties, thermal stability and good structural stability in water. TC in water can be detected by fluorescence quenching with high selectivity. At the same time, the fluorescence quenching efficiency remains unchanged in the presence of other interfering antibiotics and in aqueous solutions of different pH values (pH = 3–10). The detection ability of 1 in real seawater has not changed substantially, showing considerable practical application prospects. Interestingly, 1 – 2 also efficiently detected traces of acetone in solution with detection limits of 0.07 μM (4.38 ppb) and 0.18 μM (10.85 ppb), respectively. In addition, the mechanism of fluorescence quenching is further discussed.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Xue Shao,Yuting Yang,Yi Liu,Puxuan Yan,Shuqing Zhou,Tayirjan Taylor Isimjan,Xiulin Yang
The development of non-precious metal catalysts for oxygen reduction reactions (ORR) is vital for promising clean energy technologies such as fuel cells, and zinc-air batteries. Herein, we present a stepwise synthesis of N -doped and carbon encapsulated BiOCl-CNTs heterostructures. Electrocatalytic ORR studies show that the optimized catalyst has a high half-wave potential (E 1/2 ) of 0.85 V (vs. RHE), large limiting current density (-5.34 mA cm −2 @0.6 V) in alkaline medium, and nearly perfect 4 e − reduction characteristics, even surpassing commercial Pt/C. Meanwhile, the catalyst has exceptional durability (above 97.5 % after 40000 s) and strong resistance towards methanol poisoning. The good ORR activity also results in high-performance zinc-air batteries with a specific capacity (724 mAh g −1 @10 mA cm −2 ), a high open-circuit potential of 1.51 V and a peak power density of 170.7 mW cm −2 , as well as an ultra-long charge–discharge cycle stability (155 h), comparable with the Pt/C catalyst. The catalytic mechanism reveals that the excellent electrocatalytic performance originates from the synergistic effect of N doping, oxygen vacancies, and BiOCl sites.
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2021
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IF 4.094
Xudong Zheng,Wen Sun,Ning Wei,Tingting Bian,Yi Zhang,Lingli Li,Yuzhe Zhang,Zhongyu Li,Hongxiang Ou
Phosphorus and nitrogen flow to water leads to eutrophication and depletion of reserves. Bionic-inspired tannin modification is proposed for preparing a tannin-modified La–Zn(4,4′-dipy)(OAc) 2 /bacterial cellulose composite membrane for simultaneous adsorption of total phosphorus and ammonia nitrogen in water. Its physical and chemical properties were characterized by XRD , SEM , FT-IR, TGA and other characterization methods. La–Zn(4,4′-dipy)(OAc) 2 nanomaterial achieved effective adhesion on the tannin-modified bacterial cellulose membrane. Adsorption experiments showed that the composite membrane could both adsorb total phosphorus and ammonia nitrogen, and adsorption capacity of ammonia nitrogen was better than that of total phosphorus. The maximum adsorption capacities of ammonia nitrogen and total phosphorus were 482.35 mg/g and 374.71 mg/g. In the binary solution, the adsorption capacity of the composite membrane to ammonia nitrogen and total phosphorus decreased, but the adsorption capacity to phosphorus decreased slightly. Results of adsorption experiments showed that the adsorption process of nitrogen and phosphorus by the composite membrane belonged to single-layer adsorption, and the calculation results of the kinetic equation were in accordance with the quasi-second-order, and the adsorption equilibrium of the composite membrane was reached within 360 min. In short, the composite membrane had a better adsorption and separation effect both on ammonia nitrogen and total phosphorus.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Man Guo,Meijiao Xu,Yuan Qu,Chuan Hu,Puxuan Yan,Tayirjan Taylor Isimjan,Xiulin Yang
Developing high-efficient non-noble metal-based catalysts for oxygen reduction reaction (ORR) is an inevitable way to improve Zinc-air batteries' performance (ZAB). Herein, we report a Cu 3 P/MoP electrocatalyst (Cu 3 P/MoP@C) supported by hollow-porous-carbon nanospheres displaying high electrocatalytic activity and exceptional durability in alkaline media. The optimized ORR catalyst outperformed the benchmark Pt/C (20 wt%) and most recently reported Cu-/Mo-based catalysts in various aspects. X-ray photoelectron spectroscopy reveals that the excellent ORR performance originates from the charge transfer between of Cu 3 P and MoP species. Besides, the large specific surface area of Cu 3 P/MoP@C with mesoporous structure is particularly advantageous for the inner surface contact with electrolyte to accelerate ORR kinetics. Moreover, Cu 3 P/MoP@C also exhibits a large power density of 156 mW cm −2 , a high round-trip efficiency, and superb stability over 231 h superior to Pt/C in the ZAB. This work offers a scalable and promising approach for the rational fabrication of hollow porous structure materials.
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高影响因子
JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Xian Wang,Ziyi Zhu,Lulu Chai,Junyang Ding,Li Zhong,Anrui Dong,Ting-Ting Li,Yue Hu,Jinjie Qian,Shaoming Huang
2-dimensional Co nanoparticles embedded in N-doped carbon nanosheets ( NCNS ) are derived from indium-based frameworks which are impregnated with discrete [Co(NH 3 ) 6 ] 3+ ions by high-temperature pyrolysis as a new approach to convert a 3-dimensional porous metal-organic frameworks ( CPM-5 ) to 2-dimensional functional nanosheets. The as-made porous Co, N-doped carbon nanosheets ( NCNS–Co 0.5 In 0.5 ) perform the excellent ORR catalytic activity with a half wave potential of 0.82 V in comparison with the commercial Pt/C. Meanwhile, it also owns good stability and methanol tolerance as a suitable catalyst for zinc-air batteries with a high power density of 132.2 mW cm −2 . This method can easily be extended to other In-based MOFs, including QMOF-2, In-MIL-68, InOF-1 , in which all the corresponding derived materials exhibit efficient ORR performance. Especially, the porous Co, N-doped carbon nanosheets annealed from InOF-1 ( InOF-1-Co-800 ) display an E onset of 0.93 V, a half-wave potential of 0.85V, and a diffusion-limited current of 5.40 mA cm −2 density. Our work provides a new path to tune the morphology and catalytic performance of MOF derivatives.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2019
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IF 4.029
Changzhi Yin,Ying Tang,Junqi Chen,Feihu Li,Yijun Huang,Chunchun Li,Xianran Xing,Liang Fang
Two melilite ceramics Sr 2 AGe 2 O 7 (A = Mg, Zn) with low permittivity were prepared by a solid-state reaction method. The crystal structure and microstructure of the ceramics were characterized by X-ray diffraction, transmission electron microscopy , Raman spectroscopy , and scanning electron microscopy. Both ceramics crystallized in a single melilite structure with a tetragonal space group P-42 m (113) and exhibited homogeneous microstructures. Optimum microwave dielectric properties with relative permittivity ( ε r ) of 8.56, quality factor ( Q × f ) of 28,800 GHz, and temperature coefficient of resonance frequency ( τ f ) of −70.5 ppm/°C were obtained in Sr 2 MgGe 2 O 7 sintered at 1330 °C. Sr 2 ZnGe 2 O 7 possessed ε r of 8.81, Q × f of 35,700 GHz, and τ f of −84.4 ppm/°C when sintered at 1290 °C. Thermal stability of resonance frequency was accessible when the negative τ f values of Sr 2 AGe 2 O 7 were adjusted after the formation of composite ceramics with CaTiO 3 .
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高影响因子
WATER ENVIRONMENT RESEARCH
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2019
·Vol. 91
·期 7
·634-641
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IF 1.24
Xiao Zhang,Jing Zhang,Xue Huang,Qing Ping Wu,Chun Hui Yan,Jin Feng Lu
ZnO/Fe 3 O 4 @carbon spheres, which synthesized via a calcination process used Zn/Fe metal–organic frameworks (Zn/Fe–MOFs) as a precursor, were studied for the activation of peroxymonosulfate (PMS) for the degradation of Acid Orange 7 (AO7). The ZnO/Fe 3 O 4 @carbon spheres exhibited relatively high catalytic degradation properties for AO7 in an aqueous solution. The AO7 degradation reached 93.6% in 15 min under the conditions: 0.20 g/L ZnO/Fe 3 O 4 @carbon spheres, 1.25 mmol/L PMS, 0.03 mmol/L AO7, and initial pH of 4. Findings revealed that higher ZnO/Fe 3 O 4 @carbon spheres dose and PMS concentration, lower initial AO7 concentration, and acidic pH favored the AO7 degradation to a certain extent. The mechanisms for the activation of PMS by ZnO/Fe 3 O 4 @carbon spheres were proposed based on the results of radical identification tests and structure characterization. Both radical and nonradical pathways contribute to the AO7 degradation in this system. Practitioner points PMS + ZnO/Fe 3 O 4 @carbon spheres system can effectively catalyze PMS to decompose AO7. Both radical and nonradical pathways contribute to the degradation of AO7 in this system. The acidic condition was favorable for the activation of PMS.
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高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 4
·045514
·
IF 1.449
Jian Feng,Xiaosheng Yang,Rong Li,Xianjiong Yang,Hong Xu,Xiaolan Xi
Graphitic carbon nitride (g-C3N4) is the most stable allotrope of carbon nitride with a conjugated, two-dimensional polymer of s-triazine, which is considered as a promising photocatalyst in sustainable chemistry. The low surface area and quantum efficiency and fast electron-hole recombination of g-C3N4 restrict its practical application. The formation of two-dimensional mesoporous structure and the construction of proper semiconductor composites are two approaches to promote the effective separation of photogenerated exciton and reduce the charge transfer resistance, which is beneficial to restrain the recombination of exciton and improve photocatalytic hydrogen performance. In this work, two-dimensional mesoporous g-C3N4 nanosheets (MCNS) coupled with nonstoichiometric Zn-Cu-In-S (ZCIS) nanocrystals were synthesized by a hydrothermal method. The constructed ZCIS/MCNS composites possessed highly photocatalytic hydrogen evolution performance under visible light irradiation without any noble metal cocatalysts. The EIS spectra and transient photocurrent responses corroborated ZCIS/MCNS had higher separation and transportation efficiency of photogenerated electron and hole. The incorporation of ZCIS into MCNS reduced the charge transfer resistance and enhanced the charge transfer efficiency. As the result, the photocatalytic hydrogen evolution rate of ZCIS/MCNS was higher than those of pure ZCIS and MCNS. 10-0.2ZCIS/MCNS showed a highest H2 production rate of 12.3 μmol h−1 over 100 mg photocatalyst without cocatalysts. This work supplied a feasible strategy to construct ZCIS/MCNS composites for the exploitation of solar energy.
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危险品化学品经营许可证（带存储）