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Voltammetry

Xem 1-20 trên 26 kết quả Voltammetry
  • Voltammetry techniques measure current as a function of applied potential under conditions that promote polarization of a working electrode. Polarography: Invented by J. Heyrovsky (Nobel Prize 1959). Differs from voltammetry in that it employs a dropping mercury electrode (DME) to continuously renew the electrode surface. Amperometry: current proportional to analyte concentration is monitored at a fixed potential

    pdf12p qdung92ct 03-07-2012 49 12   Download

  • The cathodic reduction of nitrate and nitrite ions on a copper electrode in aqueous potassium chloride solutions was studied using cyclic voltammetry technique. The cyclic voltammograms showed that nitrate and nitrite ion reduction occurred in the 0.14 M KCl solution with peak potentials of -1.25 to -1.30 V and -1.20 to -1.25 V (Ag/AgCl) respectively.

    pdf7p uocvong02 24-09-2015 41 5   Download

  • (bq) part 1 book "electrochemical methods - fundamentals and applications" has contents: introduction and overview of electrode processes, potentials and thermodynamics of cells, kinetics of electrode reactions, mass transfer by migration and diffusion, basic potential step methods, potential sweep methods, polarography and pulse voltammetry,...and other contents.

    pdf488p bautroibinhyen20 06-03-2017 15 3   Download

  • To help you further Chemistry references. Invite you to consult the document content "Chapter 7: Electroanalytical Techniques". The contents of the presentation materials: Fundamentals of electrolysis, electrogravimetric analysis, voltammetry. Hope this is useful references for you.

    doc13p thangdambme 15-11-2015 25 1   Download

  • The effect of temperature and conversion of glycerol was studied by using cyclic voltammetry technique. The results showed that this reaction occurred following to diffusion mechanism with activation energy approximately of 3.44 (kcal/mol). Moreover, conversion of glycerol by electrolysis using Pt-Pd-Ni/C catalyst also was investigated and compared with the case of using pure Pt. Electrolysis process with electrode Pt-Pd-Ni/GC and pure Pt-was occurred by the first order and this result was well-suit with the previous study about the reaction mechanism of glycerol electro-oxidation process.

    pdf6p cumeo2009 30-07-2018 6 0   Download

  • The ultimate goal of this paper is to develop derivatives of ferroceneservingas an electrochemical probe that would enhance the performance of immunosensor.An immunosensor based on polypyrrole-streptavidin layer as platform for immobilization of biotinylatedferrocene and antibodies was developed. The measurement of redox signal of ferrocene was analyzed by differential pulse voltammetry (DPV) method and underlined a variation of redox properties upon the antigen interaction.

    pdf10p cumeo3000 01-08-2018 11 0   Download

  • The cathodic reduction of nitrate and nitrite ions on a copper electrode in aqueous potassium chloride solutions was studied using cyclic voltammetry technique. The cyclic voltammograms showed that nitrate and nitrite ion reduction occurred in the 0.14 M KCl solution with peak potentials of -1.25 to -1.30 V and -1.20 to -1.25 V (Ag/AgCl) respectively.

    pdf7p chikychiky 11-11-2018 10 0   Download

  • Cơ chế của quá trình oxi hóa điện hóa pirol thành polypirol chưa được nghiên cứu đầy đủ. Để góp phần làm sáng tỏ vấn đề này, bài báo tập trung nghiên cứu động học phản ứng oxi hóa pirol tạo màng polypirol bằng phương pháp cyclic voltammetry.

    doc10p thiendiadaodien_5 08-01-2019 5 0   Download

  • Đồ án tốt nghiệp: Nghiên cứu hành vi điện hoá của vật liệu điện cực và dung môi trong nguồn điện Lithium trình bày về các phương pháp để nghiên cứu hành vi điện hoá của vật liệu điện cực và dung môi trong nguồn điện Lithium bao gồm phương pháp quét thế vòng CV(Cyclic voltammetry), phương pháp đo phổ tổng trở, phương pháp đo đường cong phóng điện.

     

     

    pdf61p namhoang39 01-06-2015 112 48   Download

  • Bài viết trình bày kết quả tổng hợp polyaniline (PANi) lên điện cực giấy bucky bằng phương pháp điện hóa, với quy trình tổng hợp đơn giản, thực hiện thí nghiệm tại nhiệt độ phòng. Các kết quả về đường cong cyclic-voltamtry đã chứng tỏ phản ứng điện hóa diễn ra trên bề mặt điện cực Pt oxy hóa hai giai đoạn.

    pdf13p baoanhlib 24-01-2017 25 5   Download

  • One of the subjects of Ni-MH batteries studies is justly the electrochemically active material for the positive electrode-hydroxide nickel. This hydroxide Ni(OH)2 has been prepared in laboratory by chemical sedimentation from NiCl2 and NaOH solutions. The obtained product has been examined using different techniques, such as X ray Diffraction (XRD), Scanning Electronic Microscope (SEM) and electrochemical polarisation (cyclic voltammetry CV). The obtained results of obtained Ni(OH)2 show -type crystal, with grains of about 15 µm.

    pdf5p uocvong01 24-09-2015 28 3   Download

  • The electrophoretic deposition (EPD) method was adopted for a fabrication of nanocomposite layers composed of ZnO particles covered by the polythiopene shell in a reduced state. This composite was prepared by oxidative polymerization of thiophene monomer with iron (III) chloride as a catalyst in the presence of ZnO particles. After polymerization, polythiophene in oxidized form was reduced by the extraction in methanol. Electrochemical properties of the obtained composite were measured by cyclic voltammetry and electrochemical impedance spectroscopy.

    pdf6p uocvong02 24-09-2015 18 3   Download

  • In this paper, nickel oxide thin films on the titanium substrate were prepared by the sol-gel dipcoating technique with the precursors NiSO4.7H2O and acetic acid. The obtained thin films have a good adhesion to the substrate. The electrochemical behaviors of the NiOxHy thin films were investigated in KOH 1 M solution by the voltammetry technique. The effect of addition of platinum, heating temperature and the dip coating number on the electrochemical behavior was also investigated. The thin films have high electrochemical properties at 270o C and at third dip coating.

    pdf5p uocvong03 24-09-2015 40 3   Download

  • Chemical structure of -aminonaphthalene (ANa) allows to deal with its electrochemical polymerisation, analogously as for aniline. To determine the oxidation potentials of ANa, the polymerisation has been realised on Pt electrode using cyclic polarisation. It was found that in sulphuric acid 0.5 M the first oxidation starts at 620 mV/SCE with the peak potential at 760 mV, and the second oxidation at 890 mV/SCE with the peak potential at 1230 mV. The PANa film development decreases the current peaks meaning a reduction of polymerisation rate.

    pdf5p uocvong03 24-09-2015 28 3   Download

  • Electrochemical systems—e.g., batteries, capacitors, and fuel cells—are an integral part of modern technology. Electrochemical techniques, especially potentiometry and voltammetry, are indispensable for state-of-the-art analysis, and also for fundamental studies of the properties of solution species and solid phases and materials. Last, but not least, electrochemical concepts for understanding charge transfer reactions entered the fields of biochemistry and biophysics.

    pdf177p coeus75 29-01-2013 40 2   Download

  • Polyaniline has been utilised as an additive of the LaNi5 based negative electrodes which are activated using cyclic voltammetry. With GPES programme, exchange current i0, polarisation resistance Rp were determined. Variation of these parameters, and also of the currents at E = - 0.8 V and E = -1.2 V and of the charges quantities of charging process Qn and of discharging process Qp, as a function of PANi weight percentage x (wt%), have been studied, in order to estimate the effect of the ratios x on the negative electrodes activation.

    pdf6p uocvong01 24-09-2015 14 2   Download

  • For the first time, the detection of DNA sequences, related to HIV (found in AIDS patients), using Methylene Blue (MB) as the redox indicator was performed. The voltametric signals have been investigated on bared chitosan (CS) modified; probe immobilized (DNA single strand) and target-hybridized (DNA double strand) electrodes sequentially by means of Cyclic Voltammetry (CV) and Square Wave Voltammetry (SWV). The response of hybridization between the probe and perfectly complementary, double-base mismatch, single-base mismatch of analyzed targets were clearly identified.

    pdf5p uocvong03 24-09-2015 15 2   Download

  • Trong báo cáo này, chúng tôi chế tạo điện cực hoạt động ứng dụng trong cảm biến sinh học galactose dựa trên nền thanh nano ZnO được cố định enzyme galactose oxidase. Kết quả CV (Cyclic Voltammetry) thu được cho thấy hệ điện cực này hoạt động tốt trong dung dịch galactose oxidase nồng độ thay đổi từ 40 mM đến 230 mM với thời gian cố định enzyme là 3 giờ 30 phút.

    pdf7p ironman1234 06-06-2018 13 2   Download

  • Bismuth film electrode (BiFE) of less environmentally concern was developed to determine blood lead by differential pulse - anodic stripping voltammetry (DP-ASV). The lead determination gained high precision (RSD < 4.5%, n = 2) and low detection limit (0.7 ppb), that were not worse than those on mercury film electrode (MFE). The acurracy of the lead dertermination (recovery 98 – 100.6%) was good agreement with GF-AAS determination (p > 0.05).

    pdf8p uocvong01 24-09-2015 28 1   Download

  • In this study, TiO2 was fabricated from Vietnamese ilmenite using plasma treatment. It was used as the active material in the metal-air battery to find the better anode material for metalair battery. The physical and electrochemical properties of TiO2 samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and cyclic voltammetry (CV).

    pdf7p truongtien_09 08-04-2018 6 0   Download

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