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Institution

DECHEMA

NonprofitFrankfurt am Main, Germany
About: DECHEMA is a nonprofit organization based out in Frankfurt am Main, Germany. It is known for research contribution in the topics: Corrosion & Oxide. The organization has 756 authors who have published 1307 publications receiving 25693 citations.
Topics: Corrosion, Oxide, Coating, Alloy, Catalysis


Papers
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Journal ArticleDOI
Jean-Francois Drillet1, Roland Dittmeyer1, K. Jüttner1, L. Li1, Klaus-Michael Mangold1 
TL;DR: In this paper, the characterization of PEDOT and PSS as a diffusion layer material for the DMFC anode has been carried out in a three-electrode half-cell at room temperature.
Abstract: The conducting polymer PEDOT is tested as a carbon substitute material for the DMFC anode. Electrochemical experiments are carried out in a three-electrode half-cell at room temperature. The first part of this paper focuses on the characterization of PEDOT and PEDOT-PSS as a diffusion layer material. PEDOT/C cyclic voltammograms are recorded in 1 M H2SO4 in the range between the hydrogen evolution and polymer over-oxidation potentials. The incorporation of the PSS counter-ion into the polymer matrix leads to higher impedance values compared to PEDOT without PSS. The second part deals with the study of PEDOT as a Pt catalyst support. It is found that the partial over-oxidation of PEDOT enhances the activity of Pt for methanol oxidation. This can be explained by a change in the morphology of PEDOT that probably improves methanol diffusion within the reaction layer. The degradation of the conducting polymer is confirmed by SEM, EDX, and FTIR measurements.

30 citations

Journal ArticleDOI
Gerhard Kreysa1
TL;DR: In this article, an automated full-scale plant has been developed in collaboration with an industrial firm for the treatment of copper-containing electroplating wash waters and the first results obtained in a trial run are given.
Abstract: Fixed-bed electrolysis – a process for purifying waste water contaminated with metals. In an effort to combine the purification of metal-containing electroplating wastes with the recovery of valuable materials and a recycling of the wash water greater substitution of the hydroxide precipitation will be necessary in the future. The electrochemical separation of dissolved metals represents an interesting alternative if material transport is intensified by use of a fixed-bed electrode and the specific surface area of the electrode is so increased that high yields of recovery are achievable from low concentrations. The separation of various metals and the influence of operating parameters have been investigated on a pilot-plant scale, and separations of down to less than one 1000th of the initial concentration and final concentrations below 0.1 ppm are currently being achieved. On the basis of these investigations an automated full-scale plant has been developed in collaboration with an industrial firm for the treatment of copper-containing electroplating wash waters. The first results obtained in a trial run are given.

30 citations

Journal ArticleDOI
Gerhard Kreysa1
TL;DR: In this article, the theoretical principles of the macrokinetics of fixed-bed and fluidized-bed electrolysis with three-dimensional (3D) electrodes are discussed. And the authors describe a waste-water purification process by fixed bed electrolysis, which is already in industrial use, of the rotating fixed bed electrode, and of the state of the art of fluidized bed electrolyisation for production of metals.
Abstract: Electrochemistry with three-dimensional electrodes. Three-dimensional electrodes such as are used in fixed-bed and fluidized bed electrolysis are suitable for purifying waste water containing heavy metals and for metal recovery from dilute solutions, and also open up new possibilities for electrochemical purification of waste gases. An account of the theoretical principles of the macrokinetics of these systems is followed by descriptions of a waste-water purification process by fixed bed electrolysis, which is already in industrial use, of the rotating fixed-bed electrode, and of the state of the art of fluidized bed electrolysis for production of metals. An electrochemical absorption tower permits removal of chlorine and sulphur dioxide from waste gases.

30 citations

Journal ArticleDOI
TL;DR: In this article, a new process for removal of sulphur dioxide from waste gases is proposed consisting of both electrochemical and catalytic sulfur dioxide oxidation, and the basic reactions of this process have been studied experimentally in detail.
Abstract: A new process for removal of sulphur dioxide from waste gases is proposed consisting of both electrochemical and catalytic sulphur dioxide oxidation. In the catalytic step a part of the sulphur dioxide is oxidized by oxygen on copper producing sulphuric acid and copper sulphate. The other part is oxidized electrochemically on graphite. The cathodic reaction of this electrolysis is used for recovering the copper dissolved in the catalytic step. The basic reactions of this process have been studied experimentally in detail. It has been shown that sulphur dioxide can be electrochemically oxidized on carbon electrodes to sulphuric acid with high current efficiency. The reaction rate of the electrochemical copper deposition is increased by dissolved sulphur dioxide in the electrolyte. The catalytic oxidation of sulphur dioxide on copper has been investigated for different sulphur dioxide concentrations and temperatures. The ratio of the reaction products, sulphuric acid and copper sulphate, varies over a wide range depending on the experimental conditions.

30 citations


Authors

Showing all 760 results

NameH-indexPapersCitations
Wolf B. Frommer10534530918
Michael W. Anderson10180863603
João Rocha93152149472
Martin Muhler7760625850
Michael Hunger6029511370
Ivars Neretnieks442247159
Michael Schütze403436311
Jens Schrader381294239
Roland Dittmeyer312063762
Lei Li291984003
Dirk Holtmann291073033
Lasse Greiner26741994
Klaus-Michael Mangold23571590
A. Rahmel23591967
Gerhard Kreysa22781305
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
20227
202145
202053
201949
201844