ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Xingyue Liu,Zhiyong Liu,Bo Sun,Xianhua Tan,Haibo Ye,Yuxue Tu,Tielin Shi,Zirong Tang,Guanglan Liao
Electron transport layer (ETL), functioning as the electron transportation and extraction layer as well as hole-blocking layer, plays an important role in planar perovskite solar cells (PSCs). Majority of the state-of-the-art PSCs contain a TiO 2 ETL always requiring a high temperature (500 °C) treatment, which is both energy-consuming and incompatible with flexible substrates, thus hindering large-scale application in flexible devices. Here, we demonstrated a low-temperature (70 °C) solution-processed Mg-doped rutile TiO 2 as ETL in planar PSCs, while the thermal-evaporated copper phthalocyanine (CuPc) and doctor-bladed carbon were introduced as the hole transport layer (HTL) and counter electrode, respectively. The as-prepared PSC obtains a 15.73% power conversion efficiency (PCE), which is quite an excellent efficiency among carbon-based planar PSCs, getting an increase by 16% compared to the 13.56% PCE of the pristine TiO 2 -based device. The prominent increment is mainly attributed to the faster charge extraction, better electrical conductivity and suppressed charge recombination of Mg-doped TiO 2 . Besides, using highly stable CuPc and commercial carbon makes the as-prepared PSCs highly durable over 30 days when exposed to the ambient air with a relative humidity of 50%. Since all the processes are conducted under 100 °C, our work paves a way for developing cost-effective and highly stable PSCs compatible with flexible substrates.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 47
·12879-12887
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IF 5.976
Zhuang Li,Fei Liang,Yangwu Guo,Zheshuai Lin,Jiyong Yao,Guochun Zhang,Wenlong Yin,Yicheng Wu,Chuangtian Chen
Demands for UV birefringent materials are growing dramatically owing to the rapid development of ultraviolet technology. Here, a new family of UV birefringent materials, Ba2Mg(C3N3O3)2 (BMCY) and Ba2Ca(C3N3O3)2 (BCCY), have been successfully discovered. It is the first time that the excellent birefringent properties of cyanurates have been studied. These materials exhibit an extremely large birefringence (Δn = 0.728–0.351 and 0.771–0.346 from 230 nm to 800 nm for BMCY and BCCY, respectively), much larger than that of the commercial UV birefringent crystal α-BaB2O4 (α-BBO) (Δn = 0.12@532 nm). Our study indicates that the impressive optical properties of BMCY and BCCY stem from the strengthened optical anisotropy of the planar (C3N3O3)3− group compared with the isoelectronic (B3O6)3− group. Besides, its congruent-melting properties make it feasible to grow a bulk crystal by the Bridgman–Stockbarger technique. The extraordinary properties of BMCY and BCCY may shed light on a new path to explore birefringent materials for practical application.
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ACS Sustainable Chemistry & Engineering
·
2015
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IF 4.642
Zanyong Zhuang,Xinwen Ou,Jingyuan Li,Yuan Zhou,Zhihong Zhang,Shengfa Dong,Zhang Lin
Abundant salts and complex constituents pose challenges to the enrichment of trace-level uranyl from field water samples. On the basis of the chemical behavior of the uranyl cation in several physical–chemical conditions (in the presence of MgCl2 etc.), we developed a facile and green strategy to improve the uranyl extraction from field water samples, different from the traditional way with organic impregnation. In our systems about nano-Mg(OH)2 treating salt lake brine, when the adsorbent is pretreated with a trace amount of UO22+ ion, the ability to extract uranyl from brine can increase by 2–5 times. The molecular dynamics simulation and time-resolved laser-induced fluorescence spectroscopy analysis show that, in the preadsorption stage, UO22+ ions can steadily bind to the Mg(OH)2 (001) surface because of the interaction with surface hydroxyl groups. When pretreated Mg(OH)2 was exposed to brine, the coordination interaction between the preloaded UO22+ ion and the [UO2(CO3)x(2x–2)–] in solution engenders good selectivity and affinity for uranyl over competitive ions in brine. Besides, the coordination number of UO22+ by carbonate oxygen is large, which further facilitates subsequent adsorption. Such strategy does not introduce other impurities and can apply to metal-oxides-type adsorbents, e.g., TiO2. This study should shed light on further improvement of efficient uranyl extraction from field samples and give insights into the mechanism understanding of uranyl adsorption in real systems.
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RSC Advances
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2016
·Vol. 6
·期 72
·67610-67618
·
IF 3.289
Xiuling Xu,Fan Hu,Saisai Yan,Jianguang Lin,Qing Li,Qi Shuai
Four novel Mg(II) coordination compounds [Mg(CPA)2(H2O)4] 1, [Mg(H2O)6]·(MCPA)2 2, [Mg(DCPA)(H2O)5]·(DCPA) 3 and [Mg(TCPA)2(H2O)4]·2H2O 4 were designed by the strategy of hydrogen bonding driven self-assembly (HCPA = 2-chlorophenoxyacetic acid, HMCPA = 2-methyl-4-chlorophenoxyacetic acid, HDCPA = 2,3-dichlorophenoxyacetic acid and HTCPA = 2,4,6-trichlorophenoxyacetic acid). Single-crystal X-ray diffraction demonstrated that each coordination compound had its own specific motif driven by multiple hydrogen bonding: rectangle motif (compound 1), butterfly motif (compound 2), head and tail connected double heart-rectangle motif (compound 3) and alternative one side shared hexagon-rectangle motif (compound 4). The hydrogen bonding effects (O–H⋯Cl and O–H⋯O) on thermostability of the title compounds were well proved by TG analysis. The antibacterial activity of 1–4 has been explored, and all of them showed antibacterial efficiency against colibacillus at certain concentrations. The number of chlorides in the ligands seemed to affect the efficiency of the complexes while their position had no obvious effect. In addition, all the title compounds were evaluated for plant growth regulation by using the lettuce seedling growth bioassay. The results showed that these kinds of compounds had potential to serve as natural plant growth regulators because of their higher allelopathic activity. This research firstly applied the effective microwave method to synthesize Mg(II) phenoxy carboxylic acid coordination compounds. The design strategy of hydrogen-bonding-driven self-assembly presented here gave a novel insight into the further structural prediction and biofunction achievement of Mg(II) supramolecular assemblies.
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EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Dan Zhang,Yue Zhao,Qi He,Kaixuan Feng,Zhi Hu,Guohong Ma,Zengxi Pan
Magnesium (Mg) alloys are susceptible to being attacked by corrosive ions in practical application environments, which limits their widespread application as the most promising engineering material. Herein, the superhydrophobic composite coating PVB/STA/ZIF-8@SiO 2 (PSZS) has been designed on the surface of Mg alloy by using a drop coating method to improve its corrosion resistance. In this study, we provide an approachable decoration strategy for hydrophobic and hierarchical modification of zeolite imidazolate frameworks (ZIF-8) with stearic acid (STA) and SiO 2 , and combined with polyvinyl butyral (PVB) to form a composite coating with excellent performance on the substrate surface. Notably, the PSZS composite coating exhibited superhydrophobic and the contact angle is greater than 150° after 300 cm of mechanical friction. The electrochemical testing of the PSZS composite coating indicated that it greatly protected the Mg alloys from corrosion. Moreover, the PSZS coating displayed highly effective corrosion resistance even after being immersed in 3.5 wt% NaCl aqueous solution for 7 days. Overall, the PSZS composite coating with the advantages of corrosion resistance, corrosion durability, superhydrophobic, abrasion resistance and simple preparation process broadens the horizons of Mg alloy corrosion resistance research.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Zhihan Cai,Wangzhe Xia,Haibo Li,Rui Qin,Fangping Wu,Jianhong Wu,Xianze Yin,Zehao Li,Yongsheng Yang
Water pollution is a critical global environmental challenge, necessitating efficient and innovative remediation strategies. This work outlines the successful synthesis of poly(vinylidene fluoride) (PVDF) composite membranes infused with varying proportions of magnesium-doped zinc oxide (MgZnO) using an economical and simplified interfacial film-forming method. The MgZnO0.1PVDF1–1 composite membrane demonstrates exceptional and stable purification performance, significantly reducing the amount of antibiotics in water through a combination of static adsorption and ultrasound-guided piezoelectric degradation. SEM/FTIR/XPS/BET analyses postulate the underlying adsorption mechanisms as surface complexation, ion-dipole interaction, and cation exchange coupled with piezoelectric catalysis via the ion-dipole moment effect. The degradation process leverages a unique converse and positive piezoelectric effect, inducing surface mechanical deformation and internal free radical polarization and fostering outstanding tetracycline (TC) degradation. Comprehensive experiments considering variables such as pH, concentration, and reaction time further substantiate the superior performance of MgZnO0.1PVDF1–1, achieving an impressive maximum TC removal ratio of 86%. The high TC removal efficiency, enduring recycle performance, and economical operative method underline MgZnO0.1PVDF1–1 as a significant potential for mitigating antibiotic water pollution.
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Materials Today Communications
·
2024
·
IF 3.7
Xianze Meng,Qianru Zhang,Xuantong Lv,Jiabo Chen,Yingzi Peng,Pengxuan Dong,Qingqing Sun
The corrosion inhibition performance of three amino acids, namely L-Phenylalanine (Phe), L-Methionine (Met) and L-Histidine (His) on 7150 Al alloy in 0.1 M HCl + 1 M NaCl solution was investigated by using electrochemical impedance spectroscopy (EIS), cyclic polarization, DFT and MD simulations. Electrochemical results indicate that all the studied amino acid inhibitors are cathodic type, and the inhibition efficiency follows the following order under all studied temperatures (25, 35 and 45 ℃): His > Met > Phe. A strong correlation between corrosion inhibition efficiency and DFT parameters is not evident, but the adsorption sites (N and O of NH 2 -COOH-, S atom of Met and two N atoms in the imidazolyl ring of His) can be determined by Fukui indices and Mulliken charges of the local atoms. In addition, MD simulations indicate that corrosion inhibition efficiency increases with the decreasing of adsorption energy.
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Nanoscale
·
2012
·Vol. 4
·期 7
·2423-2430
·
IF 5.914
Qing Cao,Feng Huang,Zanyong Zhuang,Zhang Lin
This work aims at the investigation of nano-Mg(OH)2 as a promising adsorbent for uranium recovery from water. Systematic analysis including the uranium adsorption isotherm, the kinetics and the thermodynamics of adsorption of low concentrations of uranyl tricarbonate (0.1–20 mg L−1) by nano-Mg(OH)2 was carried out. The results showed a spontaneous and exothermic uranium adsorption process by Mg(OH)2, which could be well described with pseudo second order kinetics. Surface site calculation and zeta potential measurement further demonstrated that UO2(CO3)34− was a monolayer adsorbed onto nano-Mg(OH)2 by electrostatic forces. Accordingly, the adsorption behavior met the conditions of the Langmuir isotherm. Moreover, in most of the reported literature, nano-Mg(OH)2 had a higher UO2(CO3)34− adsorption affinity b, which implied a higher adsorption amount at equilibrium in a dilute adsorbate system. The significance of the adsorption affinity b for choosing and designing adsorbents with respect to low concentration of resources/pollutants treatment has also been assessed.
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PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2017
·
IF 4.784
Ziye Ling,Junwan Liu,Qianhao Wang,Wenzhu Lin,Xiaoming Fang,Zhengguo Zhang
MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic has a proper melting point and high latent heat for solar water heating systems with latent heat storage . In this paper, the exact composition of the eutectic and the corresponding phase change temperature are determined by measuring the phase change characteristics of mixtures of MgCl 2 ·6H 2 O and Mg(NO 3 ) 2 ·6H 2 O in various ratios. MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectics, the melting temperature of which is around 58 °C, can be obtained with the mass fraction of MgCl 2 ·6H 2 O ranging from 35% to 50%. The eutectics are composited with porous fumed silica to improve its thermo-physical properties. The eutectic/SiO 2 composite retains a similar melting point of the pure eutectic, is of no liquid leakage even after melting while the SiO 2 weighs more than 15 wt%, and the specific enthalpy reaches 88.13 kJ kg −1 . The eutectic/SiO 2 composite has a thermal conductivity 5% higher than pure eutectics and better thermal stability and cycle stability. The thermogravimetric analysis shows its weight loss is 8.03% less than pure eutectic at 300 °C. And the eutectics suffers a decrease in phase change enthalpy after 100 thermal cycles by 9.2%, much lower compared with the 37.23% for pure eutectics due to the phase separation during the thermal cycles. Thermo-physical properties and stability of MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic have been enhanced by fumed silica.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Anda Yu,Yulai Song,Nan Wang,Yong Tian,Hao Chen
Using hydrothermal and co-precipitation techniques, layered double hydroxides (LDHs) coatings comprising three inorganic anions (nitrate, molybdate, and stannate) and the organic anion sodium dodecyl sulfate (SDS) were created for Mg alloy surfaces. XRD, FT-IR, XPS, SEM, and EDS were used to evaluate their shape, structure, and chemical content. Electrochemical impedance spectroscopy (EIS), hydrogen evolution tests, and potentiodynamic polarization were used to assess the corrosion resistance of the LDHs coatings. Because the coatings were composed of continuously formed LDHs nanosheets, they provided a tremendous lot of protection to the Mg substrate. The single-frequency EIS, strain-potential curves, and scratch tests were used to investigate the static and dynamic self-healing properties. Among the coatings, LDHs-SDS demonstrated optimal self-healing, with a repair potential of -1.09 V and sustained stability, attributed to SDS's physical adsorption. The LDHs-MoO 4 2- coating exhibited a self-healing duration of 33,330 s, effectively repairing larger cracks due to molybdate ion exchange, which inhibited corrosion by forming a protective layer at the cracks.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
·
IF 4.7
Pu-sheng SUI,Cheng-bao LIU,Ai-meng ZHANG,Cong SUN,Lan-yue CUI,Rong-chang ZENG
Biomimetic graphene−epoxy composite coating was fabricated with a “brick and mud” structure via a spin-coating strategy. Imidazolium-based ionic liquids modified graphene (GI) was synthesized to improve the interfacial compatibility between the graphene (G) layers and epoxy resin. The surface morphology and chemical structures were observed and analyzed through scanning electron microscopy (FE-SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) as well as Fourier transform infrared spectroscopy (FTIR). The thermal imager was used to record the temperature change on the surface. The surface resistivity and thermal conductivity of the coating were determined via volumetric surface area resistivity tester and laser flash method, respectively. The corrosion resistance was investigated through electrochemical impedance spectroscopy (EIS) and salt spray testing. The GI layers in the composite coating exhibited a near-parallel orientation, which led to improved heat transfer and electrostatic dissipative efficiency. The through-plane thermal conductivity and surface resistivity were 0.77 W·m −1 ·K −1 and 1.6×10 6 Ω·cm, respectively. Electrochemical impedance spectroscopy tests revealed that the low-frequency modulus of the coating reached 6.76×10 10 Ω·cm 2 after 40 d of immersion, which was about two orders of the magnitude higher than that of the pure epoxy coating, showing a superior corrosion resistance.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 21
·8940-8947
·
IF 3.5
Mincong Liu,Jing Zhang,Yan Peng,Shiyou Guan
The development of cost-effective and high-performance non-noble metal catalysts for the oxygen reduction reaction (ORR) holds substantial promise for real-world applications. Introducing a secondary metal to design bimetallic sites enables effective modulation of a metal–nitrogen–carbon (M–N–C) catalyst's electronic structure, providing new opportunities for enhancing ORR activity and stability. Here, we successfully synthesized an innovative hierarchical porous carbon material with dual sites of Zn and Mg (Zn/Mg–N–C) using polymeric ionic liquids (PILs) as precursors and SBA-15 as a template through a bottom-up approach. The hierarchical porous structure and optimized Zn–Mg bimetallic catalytic centers enable Zn/Mg–N–C to exhibit a half-wave potential of 0.89 V, excellent stability, and good methanol tolerance in 0.1 M KOH solution. Theoretical calculations indicated that the Zn–Mg bimetallic sites in Zn/Mg–N–C effectively lowered the ORR energy barrier. Furthermore, the Zn–air batteries assembled based on Zn/Mg–N–C demonstrated an outstanding peak power density (298.7 mW cm−2) and superior cycling stability. This work provides a method for designing and synthesizing bimetallic site catalysts for advanced catalysis.
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高影响因子
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