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1.
Electrochemical impedance measurements have been used to characterize zinc selenide films prepared by electrochemical co-deposition at a platinum rotating disk electrode. Estimations of capacitance and polarization resistance of variously prepared electrodeposits have been carried out to determine charge carrier density and corrosion rates. 相似文献
2.
Faraz Montazersadgh Hao Zhang Anas Alkayal Benjamin Buckley Ben W.Kolosz Bing Xu Jin Xuan 《Frontiers of Chemical Science and Engineering》2021,15(1):208-219
Utilizing CO2 in an electro-chemical process and synthesizing value-added chemicals are amongst the few viable and scalable pathways in carbon capture and utilization technologies.CO2 electro-reduction is also counted as one of the main options entailing less fossil fuel consumption and as a future electrical energy storage strategy.The current study aims at developing a new electrochemical platform to produce low-carbon e-biofuel through multifunctional electrosynthesis and integrated co-valorisation of biomass feedstocks with captured CO2.In this approach,CO2 is reduced at the cathode to produce drop-in fuels(e.g.,methanol)while value-added chemicals(e.g.,selective oxidation of alcohols,aldehydes,carboxylic acids and amines/amides)are produced at the anode.In this work,a numerical model of a continuous-flow design considering various anodic and cathodic reactions was built to determine the most techno-economically feasible configurations from the aspects of energy efficiency,environment impact and economical values.The reactor design was then optimized via parametric analysis. 相似文献
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A. El Ghazali S. Belcadi J. J. Rameau F. Dalard 《Journal of Applied Electrochemistry》1998,28(7):725-735
Electrosynthesis of peroxodiphosphate ions (P2O84–) was performed in 2m K3PO4, 1m K2HPO4 medium, using a platinum anode. The results showed that under conditions of potentiostatic polarization at constant potential, the reaction rate reaches a maximum value of 125mAcm–2 and a faradaic yield of 30%. From about 1.9V, the reaction kinetics are increasingly inhibited as the potential shifts positively. Rapid scanning potential voltammetry was used to characterize the oxidation state of the electrode surface. This method shows that the growth of (PtO) and (PtO2 or PtO3) oxides depend on the applied potential. It also establishes a correlation between the inhibition of P2O84– ion electrosynthesis and the oxide coating surface. When 2×10–3m KSCN is added to the solution, some oxygen evolution sites are selectively blocked and oxide occurs at more positive potential values. Consequently, the rate of peroxodiphosphate ion formation and the faradaic efficiency are increased to 380mAcm–2 and 75%, respectively. Under pulsed potential conditions it was possible to reach 1200mAcm–2 for P2O84– ion electrosynthesis with a faradaic yield of 82%. 相似文献
6.
Electrochemical ferrate generation for waste water treatment using cast irons with high silicon contents 总被引:5,自引:0,他引:5
This paper deals with the electrochemical preparation of ferrate in 15 M NaOH media, with a view to treatment of waste waters. Grey cast irons with high silicon contents were shown to allow current yields in the range 20–40% depending on the applied current density, up to 34 mA cm–2. Ferrate solutions with contents up to 0.08 M could be produced in a divided cell of simple design, and provided with flat or packed-bed electrodes. Deactivation of the anode surface was shown to be of moderate significance for hour-long runs. The ferrate produced was tested for treatment of industrial liquid wastes: coagulation efficiency of the suspended matter was comparable with that of an electrocoagulation process with sacrificial Al anodes. The potential of waste water treatment by addition of ferrate is discussed. 相似文献
7.
Lignin‐based wood adhesives are obtained that satisfy the requirements of relevant international standards for the manufacture of exterior‐grade wood particleboard. Formulations based on low molecular mass lignin and presenting an increase in the relative proportion of reactive points yield better results than the higher molecular mass lignin used in the past. These lignins allow a higher proportion of hydroxymethylation during preparation of methylolated lignins. These lignin‐based adhesives also yield acceptable results at particleboard pressing times that are sufficiently low to be of industrial significance. Lignin‐based wood adhesives, in which a nonvolatile nontoxic aldehyde (glyoxal) is substituted for formaldehyde in their preparation, are prepared and tested for application to wood panels such as particleboard. The adhesives yield good internal bond strength results for the panels, which are good enough to comfortably pass relevant international standard specifications for exterior‐grade panels. The adhesives also show sufficient reactivity to yield panels in press times comparable to that of formaldehyde‐based commercial adhesives. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1690–1699, 2007 相似文献
8.
微生物电合成(Microbial electrosynthesis,MES)为二氧化碳还原为乙酸盐和其他多碳物提供了一条可持续的生化转化途径,利用电能驱动微生物固定CO2具有原料容易、操作条件温和、不含有毒物质、环境可持续性等特点,为全球碳中和、碳减排带来了新机遇。在研究人员对提高产率、转化效率、碳链延长方面的深入研究下,基于对电极材料的选择、修饰,菌群的驯化,操作条件的限制,乙酸最高产率达1330g/(m2?d),催化转化C1废气并耦合二次发酵生产了C2-C4产物以及具有更长碳链的中链脂肪酸。在概述阴极电活性微生物吸收胞外电子的分子机制捕获和转化CO2的基础上,综述了合成有机酸的代谢原理、二维和三维等电极材料使用现状以及提高产物产率、产物及碳链延长的方法,并对未来MES的研究方向做出了展望。 相似文献
9.
K2FeO4 powders were synthesized by the ex-situ and in-situ electrochemical methods, respectively, and characterized by infrared spectrum (IR), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and BET. Their electrochemical performances were investigated by means of galvanostatic discharge and electrochemical impedance spectroscopy (EIS). The results of physical characterization showed that the two samples have simi- lar structural features, but their surface morphologies and oriented growth of the crystals are different, which results in smaller specific surface area and lower solubility of the ex-situ electrosynthesized K2FeO4 sample. The results of discharge experiments indicated that the ex-situ electrosythesized K2FeO4 electrode has much larger discharge capacity and lower electrode polarization than the in-situ electrosynthesized K2FeO4 electrode. It was found from the results of EIS that lower electrochemical polarization might be responsible for the improvement on the discharge performance of the ex-situ electrosynthesized K2FeO4 electrode. 相似文献
10.
阐述了超临界流体技术与有机电合成的优势和不足,探讨了在有机电合成中应用超临界技术的可能性,并指出其应用前景。 相似文献