JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Long Wang,Jingping Sun,Haihan Zhang,Li Xu,Guoji Liu
The N-doped mesoporous carbon materials (CNM) had been synthesized with hard template method. Benzoxazine (BOZ) was adopted as a precursor and SBA-15 as template. The electrochemical performance of carbon materials prepared by different ultrasonic time, different benzoxazine concentration and different carbonization temperature were conducted by a three-electrode system. In order to further explain electrochemical behaviour of the obtained carbon materials, the corresponding characterizations were also done. CNM-800 had a highest specific capacitance value, 428.8 F g −1 (0.25 A/g) in the three-electrode system. After 20,000 cycles of CNM-800 at the current density of 5 A g −1 , CNM-800 still had 98.5% of the original capacitance, which showed that CNM-800 had a good cycling stability. In order to investigate the application value of supercapacitors , a two-electrode system was also adopted, a maximum energy density was 11.2 Wh kg −1 . The prepared carbon material (CNM-800) have the higher specific capacitance than the related literatures. This kind of N-doped mesoporous carbon material would have a potential application value as supercapacitor.
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高影响因子
iScience
·
2021
·
IF 5.458
Wanying Du,Xionghui Jia,Zhixuan Cheng,Wanjing Xu,Yanping Li,Lun Dai
Two-dimensional (2D) semi-conductive transition metal dichalcogenides (TMDCs) have shown advantages for logic application. Complementary metal-oxide-semiconductor (CMOS) inverter is an important component in integrated circuits in view of low power consumption. So far, the performance of the reported TMDCs-based CMOS inverters is not satisfactory. Besides, most of the inverters were made of mechanically exfoliated materials, which hinders their reproducible production and large-scale integration in practical application. In this study, we demonstrate a practical approach to fabricate CMOS inverter arrays using large-area p -MoTe 2 and n -MoS 2 , which are grown via chemical vapor deposition method. The current characteristics of the channel materials are balanced by atomic layer depositing Al 2 O 3 . Complete logic swing and clear dynamic switching behavior are observed in the inverters. Especially, ultra-low power consumption of ∼0.37 nW is achieved. Our work paves the way for the application of 2D TMDCs materials in large-scale low-power-consumption logic circuits.
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PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
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2019
·
IF 3.031
Haikuan Yuan,Xiaodi Liu,Shuai Zhang,Jie Lu
Polyether-block-amide (Pebax) is a novel membrane material for pervaporative (PV) desulfurization of gasoline. In order to improve its desulfurization performance, Pebax was doubly modified by blending of perfluorosulfonic acid (PFSA) and hybridization of Si sol in this study, and Pebax-PFSA-Si hybrid membrane was fabricated. The hybrid membrane was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Polyacrylonitrile (PAN) ultrafiltration (UF) membrane as support, Pebax-PFSA-Si/PAN composite membrane was fabricated using coating method for PV desulfurization of n -heptane/thiophene mixtures. The incorporation of Si sol increased the cross-linking degree of Pebax-PFSA membrane, effectively inhibiting the excessive swelling of membrane. The dynamic absorption behavior of Pebax-PFSA-Si hybrid membrane was investigated. The degree of swelling ( DS ) of membrane increased with an increase of thiophene concentration in the feed. Effects of membrane compositions and operational variables such as feed temperature, feed sulfur concentration on desulfurization performance of Pebax-PFSA-Si/PAN composite membrane were investigated. Compared with Pebax membrane, Pebax-PFSA-Si/PAN membrane had the higher permeation flux because of the blending of PFSA and the higher enrichment factor due to the hybridization by Si sol.
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SOLAR ENERGY
·
2018
·
IF 4.374
Lianjing Zhao,Leilei Zhao,Weinan Xue,Wenjuan Fang,Yuan Wang,Yan Li
To improve the catalytic activity of carbons in counter electrodes (CEs), Cu nanoparticles (NPs) were introduced into mesoporous N-doped carbons (N-C) derived from metal-organic frameworks (MOFs) to prepare the composites of N-C and Cu NPs (N-C@Cu) via impregnation and subsequent reduction method in this work. The obtained N-C@Cu composites with 2–4 nm Cu NPs uniformly distributing in N-C were deposited onto fluorine doped tin oxide (FTO) substrates by screen-printing to fabricate CEs in quantum dot solar cells (QDSCs). The N-C@Cu CEs exhibit higher electrocatalytic activity than both pristine N-C/FTO and commonly used Cu 2 S/FTO CEs, which could be ascribed to the synergistic effect between Cu x S NPs with the excellent electrocatalytic ability and MOF derived N-C with high graphitization, large hydrophilic surface as well as the abundant dopant active sites on the reduction of polysulfide. The superior performance of N-C@Cu composites results in an improved fill factor and a high short circuit current density. Based on optimized N-C@Cu CEs and Zn-Cu-In-Se quantum dot sensitizers, the QDSCs obtained present a promising power conversion efficiency of 9.23%, significantly superior to those of pristine N-C/FTO (7.20%) and Cu 2 S/FTO (8.89%) CEs based QDSCs.
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iScience
·
2022
·
IF 6.107
Cong Niu,Jianjing Yang,Kelu Yan,Jiafang Xie,Wei Jiang,Bingwen Li,Jiangwei Wen
A straightforward and practical strategy for pyridylation of inert N-heterocycles, enabled by ammonium cation and electrochemical, has been described. This protocol gives access to various N-fused heterocycles and bidentate nitrogen ligand compounds, through dual-proton-coupled electron transfer (PCET) and radical cross-coupling in the absence of exogenous metal and redox reagent. It features broad substrate scope, wide functional group tolerance, and easy gram-scale synthesis. Various experiments and density functional theory (DFT) calculation results show the mechanism of dual PCET followed by radical cross-coupling is the preferred pathway. Moreover, ammonium salt plays the dual role of protonation reagent and electrolyte in this conversion, and the resulting product 9-(pyridin-4-yl)acridine compound can be used for fluorescence recognition of Fe 2+ and Pd 2+ with high sensitivity.
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Catalysis Science & Technology
·
2017
·Vol. 7
·期 21
·5055-5068
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IF 5.773
Pengyu Niu,Hongjuan Xi,Jun Ren,Minggui Lin,Qiang Wang,Litao Jia,Bo Hou,Debao Li
Highly siliceous ZSM-22 was synthesized under hydrothermal conditions with ZSM-22 seeds. Characterization by FT-IR and 1H and 29Si NMR spectroscopy confirms that due to the existence of defective sites in the siliceous ZSM-22, acidic silanol groups including vicinal silanol and silanol nests are detected. Acidic silanol groups are considered as the acid sites of siliceous ZSM-22. As a result, siliceous ZSM-22 shows much lower acid site density and lower acid strength than silica–alumina ZSM-22 which contains hydroxyl groups bridging Si and Al as acid sites. In n-dodecane isomerization, Pt/siliceous ZSM-22 shows much higher isomer selectivity than Pt/silica–alumina ZSM-22. Furthermore, a lower loading amount of Pt on siliceous ZSM-22 (about 0.2 wt% Pt) can lead to high isomer selectivity. Owing to the acidic silanol groups and the low acid site density of siliceous ZSM-22, a good balance between metal and acid function in Pt/siliceous ZSM-22 is achieved, which results in a lower allowable Pt loading value and higher isomer selectivity.
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PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Ao Zhou,Hao Yu,Jun Tang,Biao Zhang,Fugang Qi,Yun Zhou,Nie Zhao,Xiaoping Ouyang
With the rapid development of the modern industrial marine economy, metal corrosion and biological fouling of marine ships and engineering equipment have become the main problems affecting the development of the marine industry. Traditional single-function coatings have only anti-corrosion or anti-fouling properties, which cannot meet the current needs of marine industry development for coating protection. In this study, a self-healing coating with good anticorrosion and antifouling properties has been prepared upon functionalization of a film forming resin and modification of a nanofiller. Initially, a modified acrylic resin (PAZ/N-PMI) was successfully synthesized by inserting zinc ions and a structural functional monomer ( N -phenyl maleimide; N-PMI) into the polymer chain of an acrylic resin using free radical solution polymerization . A fluorinated silica coated hydroxylated multi-walled carbon nanotubes nanocomposite (F-MWCNTs-OH@SiO 2 ) was dispersed in PAZ/N-PMI resin to prepare the composite coating samples. The composite coating showed good performance, in which the antibacterial rate of the composite coating against Staphylococcus aureus and Escherichia coli was >99.98 %. When F-MWCNTs-OH@SiO 2 was 3 wt%, the Z f=0.01Hz of the composite coating reached the highest value, which was 3 orders of magnitude higher than that of the PAZ/N-PMI coating. At the same time, the prepared composite coating also exhibited good self-healing properties. This study provides a broad application prospect for the development of high quality marine anti-corrosion and anti-fouling organic coatings .
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高影响因子
Heliyon
·
2022
·
IF 3.776
Xiang Liu,Yongliang Wang,Li Xiao,Licheng Ma,Peiwei Han,Shufeng Ye
Gold is a valued, critical element whose chemical activation or extraction is challenging. Non-cyanide extraction of gold is now the focus, and N-bromosuccinimide(NBS) is attracting attention. Herein, new insights into the possible mechanism are deeply revealed through comprehensive analysis and detection of the reaction by using elementary gold and gold bearing ore. Experiments on gold foil indicate that Au can be activated in NBS solution to perform a satisfactory dissolution. Application of NBS in gold extraction from ore show a high yield of 86.24% under optimal conditions of NBS dosage 0.05 M, liquid-solid ratio 4:1, stirring speed 400 rpm, pH 8, 25 °C and leaching for 20 h, while yields of other coexisting metals are nearly negligible. The process leads to direct, efficient, one-pot conversion of gold, into simple water-soluble salts. Characterizations show that the framework of NBS are not destroyed, only bromine separates from the framework. The oxidation of neutral gold atom to trivalent Au (III) occurs in a mild, clean and room-temperature chemistry, which converts gold to [AuBr 4 ] - , and the framework to succinimide. The active bromine and radical Br (Br•) generated from in-situ autocatalysis of NBS are responsible for this. The systematic results herald a green procedure for preparation of gold derivatives and gold extraction industry.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 15
·7145-7157
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IF 11.301
Jinling Xue,Yinshi Li,Jue Hu
It remains a major challenge to develop a facile method to prepare non-noble metal electrocatalysts with high activity and durability to drive the sluggish oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFCs). Herein, a highly efficient bimetallic Zn/Fe@N-doped hierarchical porous carbon (Zn/Fe–N–C) catalyst derived from ZIF-8 and hemin (host–guest) was firstly reported by one-step thermal treatment. Fe2+ spatially separated by using the hemin guest in the ZIF-8 framework and hydrocarbon-branched chains form rich Fe–Nx active sites, and the evaporation of Zn2+ generates a highly porous structure in the Zn/Fe–N–C catalysts. Benefitting from this unique structure and composition, the resulting Zn/Fe2–N–C catalyst exhibits excellent ORR activities in both 0.1 M KOH (onset potential, Eonset = 1.08 V, and half-wave potential, E1/2 = 0.86 V vs. RHE) and 0.5 M H2SO4 media (Eonset = 1.04 V and E1/2 = 0.81 V), which are even comparable to those of the commercial Pt/C catalyst, and ranks among the top reported electrocatalysts. In addition, it also has outstanding long-term durability and good methanol resistance, much better than those of Pt/C in both acidic and alkaline media, which makes it one of the best non-noble alternatives of Pt-based catalysts for ORR electrocatalysis. This work highlights the potential to rationally design and fabricate high-performance ORR catalysts for fuel cell applications.
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MATERIALS LETTERS
·
2020
·
IF 3.204
Peng Zhou,Mingyu Zhang,Qizhong Huang Zhang,Zean Su,Yafeng Wang,Xiaodong Wang,Yueli Hu,Yuhao Li,Zhenghao Guo
To realize high capacity and long cycling stability for lithium-ion batteries (LIBs), a new type bimetal selenides MnSe/ZnSe encapsulated in nitrogen-doped carbon nanofibers (MZS@N-CNFs) have been fabricated for lithium ion battery via electrospinning and selenization processes. Synergistic effect of the ultrafine bimetal selenides nanoparticles provides a high specific capacity while the 1D carbon nanofibers can shorten the ions pathways and improve the conductivity. When assembled as anodes for LIBs, the MZS@N-CNFs demonstrate an extremely high capacity of 1369.1 mA h g −1 and excellent cycle stability of 826.1 mA h g −1 at 1 A g −1 after 300 cycles.
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Journal of Energy Storage
·
2022
·
IF 8.907
Zibao Qian,Xuejie Wang,Tao Liu,Liuyang Zhang,Jiaguo Yu
Sodium-ion battery is an intriguing candidate in the post‑lithium era due to the earth-abundance of sodium. Transition metal selenides, with high conductivity and theoretical capacity, have been widely used in sodium-ion batteries. However, their structures are easily crushed when assembled as the anode, resulting in rapid capacity decay and poor rate performance, limiting its commercialization. In the present work, nickel‑cobalt selenide coated by nitrogen-doped carbon is prepared to activate multi-electron redox reactions. The composite exhibits excellent rate capacity (457 mAh g −1 at 0.1 A g −1 and 296 mAh g −1 when the current density is increased to 5 A g −1 ) and cycling stability (300 mAh g −1 after 1800 cycles at 2 A g −1 ). When assembled into a sodium ion battery, a high and stable specific capacity is also realized. This work illustrates the effectiveness of in-situ carbon coating as well as the potential advantages of selenide‑carbon composite as an anode material for sodium-ion batteries.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Changwei Li,Zhefeng Gu,Songming Zhu,Dezhao Liu
This study evaluated the contribution of biotic and abiotic routes to the 17 β -estradiol (E2) removal in moving bed biofilm reactors (MBBRs), and uncovered the interrelation between the E2 removal routes and biofilm characteristics, which was not researched in previous literature. Three MBBRs with different C/N ratios (0 for C/N 0 ; 2 for C/N 2 ; and 5 for C/N 5 ) were operated in continuous mode. A 65-day degradation demonstrated that the MBBRs had high potential to remove E2 regardless of the C/N (E2 removal greater than 99% for all MBBRs; P > 0.05). Further batch tests showed that the E2 removal mainly resulted from heterotrophic activities for all MBBRs, accounting for approximately 85% for all MBBRs (P > 0.05), followed by nitrification (10–11%) and adsorption (4–5%). Importantly, lower adhesive force likely led to higher E2 adsorption onto biofilms. Besides, enhanced ammonia oxidizing rate (AOR) was consistent with the high contribution of nitrification to the E2 attenuation. Importantly, heterotrophic activity was positively correlated with its contribution to E2 removal (r = 0.99, P < 0.05). To sum, the results obtained in this study helped to understand the E2 removal routes in nitrifying biofilm systems.
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