Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 48
·25378-25384
·
IF 8.867
Tanyuan Wang,Chao Wang,Yue Jin,Anna Sviripa,Jiashun Liang,Jiantao Han,Yunhui Huang,Qing Li,Gang Wu
Transition metal phosphides are often studied as hydrogen evolution reaction cathode catalysts, but scarcely as oxygen evolution reaction (OER) anode catalysts for water oxidation. Herein, we report a new amorphous Co0.63Fe0.21P0.16 OER catalyst, which was prepared through a one-step solvothermal process. This catalyst exhibits extraordinary OER catalytic activity in alkaline media and is superior to the state of the art IrO2 in 1.0 M KOH, capable of yielding a current density of 10 mA cm−2 at an overpotential of only 217 mV. This newly achieved high activity outperforms most reported transition metal phosphide catalysts. During the OER, the surface layers of the Co0.63Fe0.21P0.16 nanospheres (200–500 nm) are oxidized, which show the typical Tafel slope of oxides around 40 mV dec−1. The in situ formation of surface Co oxides in the catalysts during the OER along with an optimal doping of Fe are found to be crucial for their remarkable activity. In particular, the metal-rich amorphous phosphide cores, i.e., substrates, probably contribute to OER performance of the catalysts due to their high electrical conductivity. This new type of surface oxidized amorphous transition metal phosphide would provide a new pathway for the design of high-performance OER electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
·
能量转换
·
纳米材料
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Synthetic and Systems Biotechnology
·
2026
·
IF 4.8
Xiaoru Zuo,Huizhi Zhang,Zhanwei Zhang,Yuanyuan Ma,Chuanbo Zhang,Wenyu Lu
The cyclic monoterpene p -menthane-3,8-diol exhibits highly effective mosquito-repellent activity. Current industrial production of PMD depends on chemically synthesized citronellal as a precursor. To provide a green, sustainable alternative for citronellal supply, we engineered a Saccharomyces cerevisiae strain for efficient de novo biosynthesis of citronellal. By enhancing geraniol synthesis, systematically redesigning the endogenous oxidoreductase system, and implementing metabolic optimization strategies, a citronellal titer of 0.13 g/L was achieved in shake-flask cultivation. By integrating this microbial fermentation step with subsequent chemical catalysis, we established a biological–chemical method for PMD production, achieving a final PMD yield of 0.64 g/L. This work represents the first semisynthetic route from glucose to PMD via a biological-chemical method, offering a novel and sustainable paradigm for PMD manufacture.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Hailong Hu,Jingguang Zhu,Maosheng Chen,Tailiang Guo,Fushan Li
High-performance inkjet-printed nickel oxide thin-film transistors (TFTs) with Al 2 O 3 high-k dielectric have been fabricated using a sol-gel precursor ink. The “coffee ring” effect during the printing process was facilely restrained by modifying the viscosity of the ink to control the outward capillary flow. The impacts on the device performance was studied in detail in consideration of annealing temperature of the nickel oxide film and the properties of dielectric layer. The optimized switching ability of the device were achieved at an annealing temperature of 280 °C on a 50-nm-thick Al 2 O 3 dielectric layer, with a hole mobility of 0.78 cm 2 /V·s, threshold voltage of −0.6 V and on/off current ratio of 5.3 × 10 4 . The as-printed p-type oxide TFTs show potential application in low-cost, large-area complementary electronic devices.
研究领域:
材料科学
·
电子工程
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ma-Lin Cui,Guo-Shi Zhang,Ze-Wen Kang,Xiao-Yan Zhang,Qing-Fan Xie,Miao-Ling Huang,Bing-Qing Wang,Da-Peng Yang
A facile strategy was proposed for the preparation of two fluorescent iridium nanoclusters of IrNCs-1 and IrNCs-2 by heating IrCl 3 in N, N -dimethylacetamide (DMA) and N -Methylformanilide (MFA), respectively. The DMA and MFA are amide compounds and contain electron-rich oxygen and nitrogen atoms. They can be used as electron donors and a fraction of electron charge was transferred to Ir atom to form ligand-to-metal charge transfer (LMCT) complexes. The Ir atoms can be stabilized in LMCT complexes via accepting and localizing the electron density. These LMCT complexes with excellent fluorescent property were defined as the IrNCs. They exhibited obvious excitation wavelength-dependent emission behavior. The emission bands of two IrNCs showed red-shifting with the increasing of excitation wavelength based on the effect of “inhomogeneous broadening”. The IrNCs-1 possessed concentration-dependent emission behavior. With the decreasing of IrNCs-1 concentrations, the fluorescence spectra showed remarkable blue-shifting due to the destruction of intermolecular hydrogen bonds between IrNCs-1. In the presence of p-nitroaniline (p-NA), the fluorescence of IrNCs-1 was significantly quenched and the fluorescence bands red-shifted strongly. According to the Stern-Volmer quenching behavior under different reaction temperature and absorbance spectra of IrNCs-1 in the presence and absence of p-NA, the dynamic quenching mechanism was included. Based on these findings, the fluorescence sensor for p-NA determination was developed with the linear range of 0.1–40 μM and the limit of detection (LOD) of 50 nM. The proposed sensor was successfully applied in the p-NA determination of tap water and lake water samples, suggesting that the novel IrNCs will be a promising candidate as a luminescence sensor.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2020
·Vol. 21
·期 6
·2211
·
IF 4.556
Wei Zhang,Danyang Li,Jianguang Zhang,Lingli Jiang,Zhaofa Li,Jun Sheng Lin
The compound 1,1,1-trichloro-2-(p-chlorophenyl)-2-(o-chlorophenyl) ethane (o,p’-DDT) has been identified as one of the endocrine-disrupting chemicals causing adverse effects on wildlife and even humans through bioaccumulation. Its detection has become increasingly important. We have obtained candidate aptamers binding too,p’-DDT by a systematic evolution of ligands by exponential enrichment (SELEX) protocol. Five out of seventeen candidate sequences were selected for preliminary characterization by SYBR Green I assay. One sequence with highest fluorescence response witho,p’-DDT, designated DDT_13, was chosen for further characterization. Its dissociation constant (Kd) was determined to be 412.3 ± 124.6 nM. DDT_13 exhibited low cross-binding activities on other tested small molecules. The good bioactivities of DDT_13 were demonstrated for the analysis of spiked lake water and tap water samples. This study provides a novelo,p’-DDT-specific probe for its future applications.Keywords:o,p’-DDT;aptamer;SELEX;AuNPs;biosensor;real water sample
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Journal of Water Process Engineering
·
2026
·
IF 6.6
Jian Ding,Zhenxuan Li,Lidong Huang,Zhu Zhu,Jingxin Shi,Naren Tuya,He Li
P loading increases calcite surface area by 56–95% and forms Ca P phases. • Ca P domains enhance removal efficiency of F by 33–60% at low concentration. • XPS confirms fluorine bound to surfaces via complexation at low F and precipitation at high F. • P-loaded calcite offers a feasible route for F removal. Phosphate (P) and fluoride commonly coexist in aquatic systems. Although P loading restructures calcite through Ca P phase formation, its influence on subsequent fluoride removal remains unclear. Calcite conditioned with high P concentrations at pH 8.3, 7.7, and 7.3 developed P-rich surface layers, with 56–95% higher specific surface areas and Ca P signatures in FTIR and XPS. SEM–EDS further revealed the development of Ca P coatings with uniform elemental distributions. Fluoride-removal experiments revealed a concentration-dependent response. At low fluoride concentrations (3–20 mg·L −1 ), P-loaded calcite consistently outperformed pristine calcite, achieving 33–60% higher removal efficiencies without measurable changes in solution pH or Ca 2+ concentration, indicating adsorption-dominated immobilization. XPS F 1 s spectra (∼684.4 eV) support fluoride association with Ca P surface domains under these conditions. At 20 mg·L −1 fluoride, HRTEM/SAED identified calcite lattice and diffraction features but no self-consistent evidence of crystalline CaF 2 in the examined regions. DFT yielded stronger F − adsorption on a representative Ca₃(PO 4 ) 2 (010) surface than on calcite (104) (−5.926 versus −3.655 eV) and showed adsorption-induced interfacial charge redistribution. In contrast, at high fluoride concentration (100 mg·L −1 ), fluoride removal was accompanied by pronounced Ca 2+ depletion and pH increases, and F 1 s binding energies (∼684.7–685.0 eV) characteristic of CaF 2 , demonstrating precipitation-dominated control irrespective of P conditioning. These results show that P loading creates chemically distinct Ca P surface environments that enhance fluoride adsorption only within a concentration window where precipitation is not thermodynamically dominant. This study clarifies the mechanistic basis for repurposing P-loaded calcite in fluoride control applications. Download: Download high-res image (281KB) Download: Download full-size image
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ChemSusChem
·
2023
·
IF 8.4
Jing Bai,Hao Li,Yuting Zhu,Yiping Zhu,Chenguang Wang,Haiyong Wang,Yuhe Liao
Graphical From the hardwood : A route was developed to transform hardwood lignin toward 2,6-dimethoxy- p -aminophenol with high yield and keeping the inherent functional groups. Lignin was first oxidized to syringaldehyde, which was converted toward 2,6-dimethoxy- p -aminophenol via oxidation, oximation, and hydrogenation. The presence of the methoxy group guaranteed the high selectivity. Although the multiple functional groups in biomass offer notable chances for producing high-value chemicals, most of the current studies focused on the (deep) defunctionalization of biomass and its derivates. Herein, we present a catalytic approach to valorize birch wood lignin with maintaining the methoxy and hydroxy groups in the final product (i. e., 2,6-dimethoxy- p -aminophenol), which has applications in different sectors such as pharmaceuticals. The proved approach involves four steps with a high yield (19.8 wt % on the basis of used lignin) to 2,6-dimethoxy- p -aminophenol. The native lignin in birch wood was first converted using alkaline aerobic oxidation in the presence of copper ions toward high-yield syringaldehyde, which was then selectively oxidized toward 2,6-dimethoxy-1,4-benzoquinone using H 2 O 2 and V 2 O 5 . Oximation of 2,6-dimethoxy-1,4-benzoquinone can selectively form 2,6-dimethoxy-1,4-benzoquinone-4-oxime, which can be quantitatively hydrogenated toward 2,6-dimethoxy- p -aminophenol. This work highlights the unique potential of biomass and its derivates for the sustainable production of high-value products with exploring the value of inherent functional groups.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Zhongzhong Jia,Song Yin,Xudong Liu,Mingxuan Liu,Hua Zhong,Shi Chen,Luozheng Zhang,Shaopeng Yang,Weiguang Kong
The p-i heterojunction imbedded underneath the perovskite layer plays a vital role in determining the efficiency and stability of inverted perovskite solar cells (PSCs). We found that poly[bis(4-phenyl) (2,4,6-trimethylphenyl) amine] (PTAA) suffers from the severely chain entanglement resulting in poor contact with perovskite. In this work, PTAA layer was treated by poly[(2,6-(4,8-bis(5-(2-ethylhexylthio)-4-fluorothiophen-2-yl)-benzo[1,2-b:4,5-b′] dithiophene))- alt -(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl) benzo[1′,2′-c:4′,5′-c′] dithiophene-4,8-dione)] (PBDB- T -SF) diluted solution in chlorobenzene . PBDB- T -SF, which contains dual carbonyl groups in its backbones and suitable electronic levels, can spontaneously fill the voids in chlorobenzene-washed PTAA (nano-PTAA). This not only promotes the work function of the substrate but also strengthens the coherence between perovskite and the substrate. Blade coated PSC (0.09 cm 2 ) containing PBDB- T -SF (s-PSCs) realized a power conversion efficiency (PCE) of 21.83 %. After aging for more than 2000 h, s-PSCs maintains 88 % of the initial efficiency which is only 59 % for the control devices.
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AUSTRALIAN JOURNAL OF CHEMISTRY
·
2013
·Vol. 67
·期 1
·134-141
·
IF 1.869
Yiheng Wang,Mengge Xia,Yongtao Wu,Meifang Zhu
Functionalized magnetic microspheres were prepared by anchoring cross-linked core–shell poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAM-co-AA)) nanoparticles onto silica-coated magnetic microspheres (Fe3O4@SiO2). First, the smaller polystyrene/P(NIPAM-co-AA) core–shell nanoparticles were synthesized through seed emulsion polymerization and adhered to the surface of amino-modified Fe3O4@SiO2 micorspheres, which were made using the modified Stöber method through electrostatic interaction under appropriate preparation conditions. An amidation reaction between the carboxylic and amino groups on the respective surfaces was then catalyzed. Finally, the novel architecture magnetic microspheres with multiresponsive functionalities were obtained, and their polymerization conditions, environmental sensitivity, and magnetic properties were discussed and optimized. The superparamagnetism and temperature/pH dual responsivity and excellent dispersibility of the P(NIPAM-co-AA) functionalized magnetic microspheres provide them with high potential to be used in the fields of controlled drug delivery, bioseparation, and catalysis.
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RSC Advances
·
2019
·Vol. 9
·期 35
·20323-20331
·
IF 3.049
Jiangkun Du,Yang Wang,Faheem,Tiantian Xu,Han Zheng,Jianguo Bao
H2O2 and persulfate (PDS) activated by iron are attracting much attention due to their strong oxidation capacity for the effective degradation of organic pollutants. However, they face problems such as requiring an acidic reaction pH and difficulty of Fe2+ regeneration. In this study, the simultaneous activation of H2O2 and persulfate by nanoscaled zero valent iron (nZVI) was investigated for the degradation of p-nitrophenol (PNP). The nZVI/H2O2/PDS oxidation system exhibited significantly higher reactivity toward PNP degradation than the systems with a single oxidant. A synergistic effect was explored between H2O2 and PDS during nZVI-mediated activation, and the molar ratio of H2O2/PDS was a key parameter in optimizing the performance of PNP degradation. The nZVI/H2O2/PDS system could function well in a wide pH range, and even 95% PNP was removed at an initial pH 10, thus markedly alleviating the pH limitations of Fenton-like processes. Both hydroxyl radicals and sulfate radicals could be identified during H2O2/PDS activation, in which H+ produced during PDS decomposition promoted H2O2 activation. The increase of oxidant concentration could significantly enhance the PNP degradation, while the presence of HCO3− and HPO42− exerted great inhibition. Furthermore, five degradation intermediates of PNP were detected and its degradation pathways in the nZVI/H2O2/PDS system were presented. This study reveals that the simultaneous activation of H2O2 and PDS by nZVI is a promising advanced oxidation tool as an alternative to typical Fenton processes for recalcitrant pollutant removal.
研究领域:
环境科学
·
化学工程
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jinhong Huang,Youhao Liao,Guanjie Li,Ning Xu,Mengqing Xu,Weishan Li
The cyclic stability of traditional poly (vinylidenefluoride- co -hexafluoropropylene) (P(VdF-HFP)) and our newly developed poly (butyl methacrylate-acrylonitrile-styrene) (P(BMA-AN-St)) copolymer-based gel polymer electrolyte (GPE) must still be improved to satisfy the increasingly rigid demands of lithium ion batteries that have higher energy densities . Series ratios of P(VdF-HFP) and P(BMA-AN-St) blended membranes were prepared using an electrospinning method to compensate for the disadvantages of a single copolymer-based membrane. The results showed that the compositions of P(VdF-HFP) and P(BMA-AN-St) had sizeable effects on the physical and electrochemical characterization of GPE, in which the P4 membrane and the GPE blending ratio of P(VdF-HFP): P(BMA-AN-St) = 1: 4 had the best properties. Because the P4 membrane showed the best interconnected pore structure and highest porosity, the GPE exhibited the highest ionic conductivity , with a value of 1.4 × 10 −3 S cm −1 at ambient temperature. Due to the better compatibility of the P4-based GPE with a lithium anode and its considerably electrochemical stability, the LiNi 0.5 Mn 1.5 O 4 /GPE/Li coin cell had an excellent cyclic performance, in which a 98% capacity retention under a 1 C rate was maintained after 150 cycles compared to the coin cell that used a pure P(VdF-HFP)-based GPE that maintained 86% of its discharge capacity under the same test conditions. Furthermore, the acceptable rate characterization of the P4-based GPE was presented with a discharge capacity at a 5 C rate that retained 92% of its counterpart at 1 C .
研究领域:
材料科学
·
电化学
·
储能技术
·
高分子科学
·
锂离子电池
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Qinzhao Sun,Bofeng Shi,Tianran Zhang,Weijie Yang,Jiping Wang,Lixue Zhang,Dezhen Xue,Zepeng Wang,Fang Kang,Xiaoxiao Zhang
Dielectric capacitors with a high energy-storage density and efficiency are urgently required for miniaturization and integration of power electronics and pulsed power system. Herein, single-layered stretched P(VDF-HFP) with a certain content of poly(methyl methacrylate) (PMMA) and two kinds of sandwich-structured films are prepared to optimize and compare energy-storage performance. The results revealed that the crystallization transition behavior of stretched P(VDF-HFP) films contributed to enhance its electric polarization, while the introduction of linear type PMMA resulted in an enhancement of voltage tolerance of stretched films by improving the mechanical properties and suppressing leakage current. What’s more, the effects of crystalline orientations and structure design on the breakdown mechanism of stretched films were revealed by finite element theoretical simulation. As a consequence, the stretched sandwich-structured 0-25-0-S (pure P(VDF-HFP) serves as the outer layer, and blends represent the middle layer; the digit representing PMMA content in the P(VDF-HFP)) displayed a high Ue of 28.71 J/cm3 and η of 74% under 680 MV/m. This work provides a workable and effective method for developing capacitive films with great energy-storage performance.
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