Electronic Material Properties - und Geowissenschaften ...

Recommendations

Info

Materials for Renewable Energies In December 2004, the new group Renewable Energies formed at the Institute for Materials Science. At present, research focuses on low-temperature fuel cells and related electrocatalysis using advanced ex-situ, and in particular, operando techniques for the detailed structural and electrochemical characterization of nanoscale catalysts. Techniques applied on the structural side include X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and transmission electron microscopy (TEM), whereas electrocatalytic activities are measured using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and single cell fuel cell tests. Recent projects concern the systematic investigation of the membrane-electrode assembly in polymer electrolyte fuel cells (PEMFC) before and after use, and its optimization according to the requirements for efficient operation. In this project, a new methodology for TEM characterization has been developed, which provides fascinating insights into the MEA structure. In another approach, a special in-situ fuel cell has been developed and successfully applied at beamlines X1, Hasylab, Hamburg, and at BM29 and ID24 at ESRF, Grenoble. First time-resolved operando experiments have been performed shedding light on fundamental mechanisms taking place during real fuel cell operation. The group has established various national and international cooperations in the fuel cell community. In a joint project with Tsinghua University, Beijing, and TUM, Munich, the application of carbon nanotube materials in PEMFC and its effect on the three-phase boundary is investigated. In cooperation with David Ramaker and his group at George Washington University, a novel data analysis technique has been developed, which allowes us to monitor changes in catalyst structure and adsorbate coverage during real cell operation. Collaborative agreements exist between the group and several companies, large scale facilities as well as national and international universities. These are largely covered by funds from the German Science foundation (DFG) and the BMBF. Teaching activities in 2006 included the regular curricula lecture “Methods in Materials Science” and the linked practical course. The group`s research interests are covered by a lecture on “Fuel Cells – from fundamentals to application” and a practical course “X-ray absorption spectroscopy – fundamentals and data analysis” (joint workshop with Prof. David Ramaker). Furthermore, a workshop on “Scientific work and presentation skills” (with Dr. I. Kinski) is offered on request. Staff Members Head Secretary Dr. Christina Roth Maria Holzmann (joint with Prof. Fuess) PHD students Dipl.-Ing. Virginie Croze Dipl.-Ing. Susanne Zils Students Guillaume Savoye Guest Scientists Dipl.-Ing. Frieder Scheiba (joint with Prof. Fuess) Dipl.-Ing. Julia Melke (extern, ISE) Dipl.-Ing. Marcelo da Carmo, IPEN, Sao Paulo (with Prof. Fuess) - 54 -
Research Projects Characterization of the three-phase boundary in differently-synthesized membraneelectrode assemblies (DFG Sino-German project 2004-2006) In-situ X-ray diffraction and X-ray absorption spectroscopy for investigation of the cathode catalyst in a working fuel cell (DFG project 2005-2008) Structural investigation of membrane-electrode assemblies in fuel cells using ESEM (DFG project 2006-2009) Chemical and morphological characterization of nanostructured electrocatalyst systems supported on modified carbon black and produced by different methods (DAAD-CAPES Brazil 2006-2007) Publications Mazurek, M.; Benker, N.; Roth, C., Buhrmester, Th.; Fuess, H.; Electrochemical impedance and X-ray absorption spectroscopy (EXAFS) as in-situ methods to study the PEMFC anode, Fuel Cells 6 (1) (2006) 16-20. Benker, N.; Roth, C.; Mazurek, M.; Fuess, H.; Synthesis and characterisation of ternary Pt/Ru/Mo catalysts for the anode of the PEM fuel cell, J. New Mat. Electrochem. Sys. 9 (2006) 121-126. Mazurek, M.; Benker, N.; Roth, C.; Fuess, H.; Structural and electrochemical investigation of binary mixtures of carbon-supported Pt and Ru catalysts for PEM fuel cells, Fuel Cells 6 (2006) 208-213. Scheiba, F.; Scholz, M.; Lin, C.; Roth, C.; Cremers, C.; Qiu, X.; Stimming, U.; Fuess, H.; On the suitability of hydrous ruthenium oxide supports to enhance intrinisic proton conductivity in direct methanol anodes, Fuel Cells 6 (2006) 439-446. Cao, L.; Scheiba, F.; Roth, C.; Schweiger, F.; Cremers, C.; Stimming, U.; Fuess, H.; Chen, L.; Zhu, W.; Qiu, X.; Novel nano-composite Pt/RuO2·xH2O/CNT catalysts for DMFC, Angew. Chem. Int. Ed. 45 (2006) 5315-5319. Roth, C.; Mazurek, M.; Benker, N.; Katalysatoren im Baukastensystem, Thema Forschung 2/2006, 58-63. - 55 -
Page 1:
ANNUAL REPORT 2 0 0 6 FACULTY OF MA
Page 4 and 5:
Annual Report 2006 Faculty 11 Mater
Page 6 and 7: Preface The year 2006 of the Depart
Page 8 and 9: difference of numerical and analyti
Page 10 and 11: Institute of Materials Science Phys
Page 12 and 13: Research Projects Bulk Amorphous Al
Page 14 and 15: el Dsoki, C.; Landersheim, V. ; Kau
Page 16 and 17: Das, J.; Kim, K. B.; Xu, W.; Wei, B
Page 18 and 19: Staff Members Head Prof. Dr. Jürge
Page 20 and 21: Zhou L.; Rixecker G.; Aldinger F.;
Page 22 and 23: concerned with the synthesis and ch
Page 24 and 25: Publications Fleissner, A.; Schmid,
Page 26 and 27: • Surface analysis The UHV-surfac
Page 28 and 29: T. Mayer, U. Weiler, E. Mankel and
Page 30 and 31: Thin films The Thin Film division w
Page 32 and 33: Berky, W.; Gottschalk, S.; Elliman,
Page 34 and 35: Guest Scientists Research Projects
Page 36 and 37: Hesse, S.; Zimmermann, J.; von Segg
Page 38 and 39: Structure Research The research in
Page 40 and 41: Research Projects Functional Advanc
Page 42 and 43: Dincer, I.; Elerman, Y.; Elmali, A;
Page 44 and 45: hexakis(imidazole)nickel(II)bis(for
Page 46 and 47: Chemical Analytics The chemical ana
Page 48 and 49: Collaborations The above mentioned
Page 50 and 51: Hoffmann, P.; Non-Invasive Identifi
Page 52 and 53: Ferroelectrics For this class of ma
Page 54 and 55: Materials Modelling The research ac
Page 58 and 59: Joint Research Laboratory Nanomater
Page 60 and 61: Collaborative Research Center (SFB)
Page 62 and 63: B7 P.I.: Prof. H. v. Seggern / Dr.
Page 64 and 65: The glass transition temperature (T
Page 66 and 67: transition allows to investigate at
Page 68 and 69: Relative density 1.00 0.95 0.90 0.8
Page 70 and 71: Fig. 2 shows the time dependencies
Page 72 and 73: Dielectric interface trap engineeri
Page 74 and 75: ∆V C q th eff 12 −2 p ( VGS = 0
Page 76 and 77: Fig. 3: Schematic of the photovolta
Page 78 and 79: synthesis and analysis of interface
Page 80 and 81: Fig. 2: Resistivity vs temperature
Page 82 and 83: Fig. 2: X-ray appearance near-edge
Page 84 and 85: Capacity [mAhg -1 ] 700 600 500 400
Page 86 and 87: Texture investigations and field em
Page 88 and 89: screening effects. Gold coating of
Page 90 and 91: Figure 2 shows a selected region of
Page 92 and 93: The spectrum shows that apart from
Page 94 and 95: The effect of crystallinity on the
Page 96 and 97: Electrochemical investigation and c
Page 98 and 99: This phenomenon can be understood c
Page 100 and 101: ∆ = 0 − exhibiting dominance of
Page 102 and 103: constituents. The requirement of va
Page 104 and 105: In order to assess the influence of
Page 106 and 107:
In this study, we have therefore de
Page 108 and 109:
Fig. 1: Proposed models for a) Pt,
Page 110 and 111:
Synthesis of oxide-polymer nanocomp
Page 112 and 113:
Diploma Theses Böhme, Mario; Herst
Page 114 and 115:
Sperling, Sebastian; Untersuchungen
Page 116 and 117:
Institute of Applied Geosiences Phy
Page 118 and 119:
Research Projects Geomorphology and
Page 120 and 121:
Engineering Geology Engineering Geo
Page 122 and 123:
Investigation of a Doline in NE-Hes
Page 124 and 125:
Applied Sedimentology Sedimentary r
Page 126 and 127:
econstruction.(Diploma thesis in co
Page 128 and 129:
Darmstadt University of Technology
Page 130 and 131:
Geomaterials Science Geomaterial Sc
Page 132 and 133:
Gregori, G.; Kleebe H.-J.; Sorarù,
Page 134 and 135:
Hessische Industriemüll GmbH). Due
Page 136 and 137:
Technical Personnel Josef Kolb, Dip
Page 138 and 139:
Research Projects Environmental sca
Page 140 and 141:
Fig. 1: Aerial photo of the Lake Li
Page 142 and 143:
Lithological Map of the Japanese Ar
Page 144 and 145:
tower stripping, and therefore much
Page 146 and 147:
Diffusion and reaction in micro- an
Page 148 and 149:
Rift dynamics, uplift and climate c
Page 150 and 151:
Geology, land use change and erosio
Page 152 and 153:
nearly half a century has been perf
Page 154 and 155:
The Effect of LiF Addition on the S
Page 156 and 157:
In case of the undoped sintered B6O
Page 158 and 159:
Microstructures in Omphacite and Ot
Page 160 and 161:
Modelling phase-assemblage diagrams
Page 162 and 163:
As an example, Fig. 2 shows the che
Page 164:
MATERIALS SCIENCE Physical Metallur
show all

Electronic Material Properties - und Geowissenschaften ...

Create successful ePaper yourself

Delete template?

Save as template?