Journal of Materials Chemistry A
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2021
·Vol. 9
·期 24
·13996-14003
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IF 12.732
Hongqiang Jin,Yu Yu,Qikai Shen,Peipei Li,Jia Yu,Weiming Chen,Xin Wang,Zhuo Kang,Lei Zhu,Runqing Zhao,Lirong Zheng,Weiguo Song,Changyan Cao
1T-phase molybdenum disulphide (MoS2) is considered to be one of the most promising candidates to substitute noble metals in the hydrogen evolution reaction (HER). Fabricating single layer 1T-phase MoS2 with abundant sulfur vacancies as well as good stability to further enhance catalytic performance remains a challenge. Herein, we develop an efficient in situ TMA cation ((CH3)4N+) intercalation method to produce 1T-phase MoS2. The obtained MoS2 nanosheets comprise about 81% 1T-phase and abundant sulfur vacancies (>12%), as verified by aberration-corrected high-angle annular dark field scanning transmission electron microscopy (AC-HAADF-STEM), X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS), etc. In addition, the surface of as-prepared ST-MoS2 is negatively charged, making it very stable in aqueous solution. The as-prepared ST-MoS2 exhibits excellent electrochemical HER performance with a low over-potential and a small Tafel slope as well as superior cycling stability. Furthermore, it is an excellent co-catalyst when coupled with CdS nanowires to form a CdS/ST-MoS2 heterojunction photocatalyst for the HER under visible light irradiation. It achieves a maximum H2 production rate and apparent quantum efficiency (AQE) of approximately 1187 μmol mg−1 h−1 and 73.4%, respectively, which are significantly higher than those of reported CdS/MoS2 photocatalysts.
研究领域:
材料科学
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纳米技术
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电化学
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催化
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能量转换
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Jishen Li,Xiyun Yang,Yuyao Fu,Haiqiang Huang,Zhijie Zhong,Yuanyuan Wang
A comprehensive utilization process of Fe, Mn, Ni and Co in the acid leaching liquor of spent lithium ion batteries was put forward. Fe and part of Mn were extracted to synthesize Fe-doped lithium ion-sieve. Ni, Co and the rest of Mn were coprecipitated to prepare ternary lithium ion battery cathode material precursor Ni x Co y Mn 1-x-y (OH) 2 . After removing Cu 2+ ions in acid leaching liquor by adding MnS, two-stage counter current extraction and one-stage stripping were used to extract all Fe 3+ and 40.3% of Mn 2+ ions in sulfuric acid leaching solution to obtain a MnSO 4 stripping solution containing Fe 3+ ions. Iron-doped lithium ion-sieve was synthesized by oxidation of the resulting MnSO 4 solution with KMnO 4 followed by roasting and acid leaching. Fe incorporates into the lattice of lithium ion-sieve and improves the structure stability. Fe-doped lithium ion-sieve shows Li adsorption capacity of 35.29 mg.g −1 and Mn dissolution loss of 1.66%. The Li + adsorption in salt lake brine with the Fe-doped ion-sieve follows a pseudo-second-order kinetic model . Ni x Co y Mn 1-x-y (OH) 2 is regular spherical particles with β-Ni(OH) 2 -like structure. This process provides a simple method for recovery and utilization of Mn, Fe, Ni and Co in spent lithium ion batteries .
研究领域:
材料科学
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资源回收利用
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电化学
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环境工程
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能源存储
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
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2017
·Vol. 7
·期 17
·3802-3811
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IF 5.773
Hong Liu,Jingchai Meng,Jiang Zhang
In this work, we demonstrated the polyvinylpyrrolidone-assisted solvothermal synthesis of three-dimensional (3D) flowerlike Mn0.8Cd0.2S microspheres assembled from nanosheets. The as-synthesized products were characterized by using various methods including powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microcopy/selected area electron diffraction, elemental mapping, X-ray photoelectron spectroscopy, inductively-coupled plasma emission spectroscopy, N2 adsorption–desorption, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy and photoelectrochemical experiments. The possible formation mechanism of the unique structures was discussed. The resultant 3D flowerlike Mn0.8Cd0.2S architectures exhibit better photocatalytic activities for H2 evolution and CO2 reduction under visible light irradiation than the Mn0.8Cd0.2S nanoparticles. A hydrogen evolution rate of 3560.3 μmol g−1 h−1 and a CH3OH production rate of 10.7 μmol g−1 h−1 are achieved on the flowerlike Mn0.8Cd0.2S microspheres. Several possible reasons for the enhanced photocatalytic activity of the Mn0.8Cd0.2S hierarchical microspheres have been taken into consideration. In addition, the Mn0.8Cd0.2S microspheres are stable during the reaction and can be used repeatedly.
研究领域:
材料科学
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环境化学
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能源化学
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纳米科技
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催化化学
✓ 已验证
DOI
高影响因子
Nano Select
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2021
·Vol. 3
·期 1
·147-156
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IF 0
Mengqiu Li,Ze Xu,Yuting Li,Juan Wang,Qin Zhong
Transition metal chalcogenides are attractive electrocatalysts for oxygen evolution reaction (OER) or hydrogen evolution reaction (HER) due to their natural abundance and diverse structure. Herein, nickel sulfides (Ni 3 S 2 ) and nickel/cobalt sulfides nanohybrid have been in situ fabricated on nickel foam (NF) by a facile hydrothermal method with sodium sulfide (Ss), L-cysteine (Lc) or thiourea (Tu) as a sulfur source, respectively. The results show that sulfur source has a great influence on the phase structure, morphology and electrocatalytic performance of transition metal sulfides. The nickel sulfide with the sodium sulfide as a sulfur source (Ni Ss ) shows better HER and OER activity in 1 M KOH. With the Co-doping, three-dimensional honeycomb-like NiCo Ss nanosheet clusters exhibits the enhanced electrocatalysis properties with overpotentials of only 168 mV at 10 mA cm –2 for HER and 234 mV at 20 mA cm –2 for OER, respectively. The NiCo Ss shows the good bifunctional activities for overall water splitting and presents considerable stability for 24 hours. The good electrochemical activities of metal sulfides by using inorganic sodium sulfide can be attributed to the large exposed surface area and heterostructure compositions of Co 9 S 8 and Ni 3 S 2 .
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2013
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IF 2.596
Guoting Cui,Wuxia Zhang,Amin Zhang,Haibo Mu,Hongjin Bai,Jinyou Duan,Cuiyun Wu
The Fructus Jujubae has been widely used as favorable food and folk medicine in China and Russia. In this study, we compared the carbohydrate constituents and antioxidative effects of Fructus Jujubae polysaccharides from five different production areas in South Xinjiang. Results demonstrated that the average annual temperature ( r = 0.590) and frost-free period ( r = 0.779) were well correlated to the uronic acid content, while the neutral carbohydrate content showed negative correlation with precipitation amount ( r = −0.567). Antioxidative tests indicated that Fructus Jujubae polysaccharides could scavenge chemicals-induced reactive oxygen species in a dose-dependent manner. In addition, these polysaccharides could rescue H 2 O 2 -induced HUVEC death. The antioxidative activity of polysaccharides from the Fructus Jujubae might contribute to their diverse medicinal and nutritional values.
研究领域:
食品科学
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植物化学
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药理学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Dandan Li,Tan Li,Genyan Hao,Wenjun Guo,Shuai Chen,Guang Liu,Jinping Li,Qiang Zhao
A hybrid oxygen evolution catalyst, IrO 2 @single-layer NiFe layered double hydroxides (SL-NiFe LDHs), is successfully synthesized by anchoring highly dispersed IrO 2 nanoparticles to SL-NiFe LDHs nanosheets with oxygen vacancies. Typically, during the synthesis process, the functional group –NH 2 from the external anchor formamide acts as a coordination site to control the nucleation and growth of nanoparticles , which can ensure high dispersion without aggregation of IrO 2 on SL-NiFe LDHs. In addition, this reducing synthetic environment causes a large number of holes and grooves in the NiFe-LDHs nanosheets, which result in the formation of oxygen vacancies in the SL-NiFe LDHs. The loading of IrO 2 nanoparticles and the formation of oxygen vacancies endow IrO 2 @SL-NiFe LDHs with excellent performance for the oxygen evolution reaction (OER). IrO 2 @SL-NiFe LDHs nanosheets display outstanding OER performance with an overpotential of 270 mV at a current density of 10 mA cm −2 and good stability. Density functional theory (DFT) calculations indicate that the hybridization of IrO 2 and SL-NiFe LDHs accelerates the reaction step. Notably, the Ir sites at the edges are more conducive to the formation of oxygen, and the oxygen sites on SL-NiFe LDHs are more conducive to the cleavage of the O–H bond, thereby improving the OER activity. This work highlights a potential synthetic strategy that can combine nanoprecious metals with transition metals to prepare highly active electrocatalysts for efficient water oxidation reactions.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
TALANTA
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2018
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IF 4.244
Xuemei Wang,Wei Zhou,Chenlu Wang,Zilin Chen
Cotton fiber was proposed as a biodegradable support material. The properties like high specific area, hygroscopicity and adjustable shape make it be an idea substrate for solid phase extraction (SPE). In this work, inorganic layered double hydroxides (LDHs) were in situ immobilized onto cotton fiber through the linker of polydopamine as stationary phase. Uniform NiAl-LDHs crystal with nanostructure was observed on cotton fiber after one-step synthesis through urea hydrolytic method. The cotton fiber can not only increase the specific area and mass transfer rate, but also prevent aggregation and blocking of the freestanding LDHs crystal. Due to the electrostatic interaction and anion exchange features of LDHs, the prepared LDHs modified cotton fiber showed good extraction efficiency and selectivity towards fluoroquinolone drugs including norfloxacin , ciprofloxacin and enrofloxacin . After elution by 1 M NaOH, a simple acid-base neutralization method was proposed, so the natural elution can be directly analyzed by HPLC system. After optimizing the extraction parameters including adsorbent amount, sampling rate, sample volume, sample pH and eluent types and concentration, excellent extraction efficiency towards three fluoroquinolone drugs was obtained with high enrichment factors of 37–47. The adsorption capacity of LDHs modified cotton fiber was 21.18, 21.85 and 20.54 mg g −1 for norfloxacin, ciprofloxacin and enrofloxacin, which was almost twice as much as that of freestanding LDHs. The established method based on SPE-HPLC-FLC (fluorescence detector) technique exhibited good linearity (R 2 ≥ 0.995), low limits of detection (0.01 µg L −1 ) and good reproducibility (intra-day RSDs ≤ 3.89%). Moreover, this method has also been applied in analyzing fluoroquinolone drugs in chicken eggs and pork liver.
研究领域:
分析化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 36
·e202401875
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IF 1.9
Haonan Li,Chenping Gao,Qingjie Liu,Yanchun Guo,Yufen Zhao
Graphical We report here a new I 2 /H 2 O 2 co-catalyzed oxidative [4+1] cyclization of benzaldehyde with 2-(aminomethyl)pyridine or o -phenylenediamine/2-aminothiophenol to provide various substituted imidazo[1,5- a ]pyridines and benzimidazoles/thiazole via C(acyl)−N bond construction. Some of heterocyclic products exhibit blue luminescence properties, as well as large Stokes shifts, eminent fluorescence quantum yields (64 %) and long fluorescence lifetimes. An efficient I 2 (10 mmol %)/H 2 O 2 mediated oxidative formal [4+1] cyclization of 2-pyridinemethylamine or o -phenylenediamine (2-aminobenzenethiol) with benzaldehyde via C−N bond formation has been developed. This strategy provides a straightforward approach to imidazo[1,5- a ]pyridines, iodo-substituted imidazo[1,5- a ]pyridines and benzimidazole (benzothiazole) derivatives in yields ranging from 60 % to 98 %, respectively. Several heterocyclic products exhibit promising blue luminous performance with satisfactory fluorescence quantum yields of up to 64 %, large Stokes shifts, and a longer lifetime (7.35 ns). The band gap energies obtained from DFT are also consistent with the absorption spectra.
研究领域:
有机化学
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光物理化学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2024
·Vol. 17
·期 3
·e202401364
·
IF 3.8
Haixia Li,Dan Li,Chuanqiang Yin,Feigao Xu
Graphical FeP/CdS Z-type heterojunction photocatalysts were successfully prepared by a facile hydrothermal method. Experimental results demonstrated that FeP/CdS composite photocatalysts have excellent performance in the catalytic degradation of TCH with the help of activated H 2 O 2 .The construction of Z-type heterostructures provided an effective photogenerated electron transfer channel, which facilitated its separation and utilization as well as accelerated the cycling of Fe 3+ /Fe 2+ . Photocatalysis is an efficient technology for the degradation of pollutants. However, it still needs to be improved. In this study, magnetic Z-scheme FeP/CdS composites heterojunction photocatalysts were prepared by a facile hydrothermal method, and the structure, morphology, optical, and photocatalytic properties of the prepared composites were investigated in detail. The efficiency of tetracycline hydrochloride (TCH) removal by FeP/CdS composites was investigated under different reaction conditions (including different FeP and CdS ratios, catalyst dosage, hydrogen peroxide consumption, temperature, and initial pH). FeP/CdS composites exhibited better catalytic performance compared with pure components. The F 1 Cd 1 composite (mass ratio of FeP to CdS is 1:1) achieved 92.7% removal efficiency of TCH; moreover, the F 1 Cd 1 composite still exhibits a high stability after five consecutive cycles. The capture experiments on the active material showed that the removal of TCH by the F 1 Cd 1 composite was mainly dominated by •OH; however, •O 2 − , e − , and h + played a minor role, and the degradation mechanism was revealed by combining various characterization techniques. The introduction of cadmium sulfide formed an effective photogenerated carrier transport channel at the interface with the iron phosphide surface, which could accelerate the transfer and separation of photo-excited e − /h + pairs, thus improving the degradation performance of TCH.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
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2015
·
IF 2.046
Wei-Guo Jia,Dan-Dan Li,Cuiping Gu,Yuan-Chen Dai,Ying-Hua Zhou,Guozan Yuan,En-Hong Sheng
Binuclear [{(DMOX)CdCl} 2 ( μ -Cl) 2 ] (DMOX = 4,5-dihydro-2-(4,5-dihydro-4,4-dimethyloxazol-2-yl)-4,4-dimethyl-oxazole) ( 1 ) and mononuclear [(Dm-Pybox)CdCl 2 ] (Dm-Pybox = 2,6-bis[4′,4′-dimethyloxazolin-2′-yl]pyridine) ( 2 ) were obtained by reacting CdCl 2 with DMOX and Dm-Pybox ligands, respectively. In the solid state, the supramolecular structures of 1 and 2 feature helical chains fabricated by C–H⋯Cl hydrogen bond interactions. The C–N cross-coupling reactions catalyzed by the two complexes were also investigated in homogeneous system. The results show that binuclear complex 1 exhibit significantly enhanced catalytic activity for C–N cross-coupling reactions.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2019
·
IF 4.745
Wubing Yao,Lili He,Deman Han,Aiguo Zhong
The first transition-metal-free catalytic protocol for controlled reduction of amide functions using cheap and bench-stable hydrosilanes as reducing agents has been established. By altering the hydrosilane and solvent, the new method enables the selective cleavage of unactivated C–O bonds in amides and allows the C–N bonds to selectively break via the deacylated cleavage. Overall, this novel process may offer a versatile alternative to current methodologies employing stoichiometric metal systems for the controlled reduction of carboxamides.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuxin Chen,Yuting Wu,Shuairen Qian,Zhengwen Li,Changyan Xu,Ruiqi Du,Yao Mu,Tianying Dai,Binhang Yan,Yi Cheng
MoVNbTeO x is the most promising catalyst for the oxidative dehydrogenation of ethane (ODHE) process, which is usually prepared by hydrothermal methods. However, the synthesis of MoVNbTeO x is time-consuming and sensitive to the homogeneity of the synthesis environment, which limits its preparation reproducibility and large-scale accessibility. In this work, a continuous flow hydrothermal synthesis (CFHTS) process for the preparation of MoVNbTeO x catalysts was developed and the synthesis parameters were screened using a tubular reactor. Using a micro coil tube as a reactor, MoVNbTeO x catalysts can be synthesized rapidly at 300 °C and 10 MPa. Meanwhile, the catalytic performance of MoVNbTeO x synthesized by CFHTS method was also significantly improved, with the activity nearly doubled compared to the samples prepared by the conventional method. Compared with the conventional method, the preparation time of CFHTS method can be shortened from 48 h in the batch mode to 10 min in the continuous mode, and the capacity per unit volume of the reactor has been increased by orders of magnitude, which provides the possibility of industrial scale-up of MoVNbTeO x catalysts.
研究领域:
化学工程
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催化材料
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能源化工
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）