Electrochemistry of Solids Physical Chemistry of Solids Materials and Methods for Electrochemical Energy Technologies

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1 Ag 4 RbI 5 Ag Ag 2+ Se 3 mm Electrochemistry of Solids Physical Chemistry of Solids Materials and Methods for Electrochemical Energy Technologies AG Prof. Jürgen Janek (Dr. Philipp Adelhelm), Institute of Physical Chemistry, Justus-Liebig-University Giessen I. Profile Current research topics within the group II. Special techniques and equipment Thin film preparation by PLD, in situ surface analysis by XPS, TOF-SIMS and REM III. Example on solid oxide fuel cell (SOFC) Transport phenomena at the YSZ/Lanthanum Strontium Manganate (LSM) interface IV. Brief overview on metal hydrides for H 2 Impact of nanoconfinement on the H 2 storage properties of NaAlH 4, NaH, and MgNi-alloys page 1 Workshop Hessische Forschungskompetenzen im Bereich H - und Brennstoffzellentechnologie, , Wiesbaden

2 I. Profile: Current research topics Battery projects Model electrodes Lithium/sulfur cells Lithium/air Electrolyte dispersions Solid electrolytes Sodium based battery systems Non-Battery projects Transport/Defects Plasma chemistry Biomaterials SOFC model systems page 2

3 II. Special methods and techniques Model systems and their characterization monolayer multilayers Additiv Aktivmaterial Grenzfläche page 3

4 II. Special methods and techniques Preparation of thin film model electrodes by Pulsed Laser Deposition (PLD) Major advantages: Flexible technique, i.e. large variety of materials can be deposited Integrated glove box offers preparation of air sensitive thin films page 4

5 II. Special methods and techniques In situ analysis of thin film model electrodes: f(t), f(u) In situ SEM In situ XPS planned In situ ToF-SIMS In situ IR/Raman page 5

6 III. Example on SOFC electrodes 700 C C LSM YSZ MP Forschung 1/2001 Kathodische Reduktion Anodische Oxidation Gesamtreaktion PhD thesis: Anne-Kathrin Huber, Hendrik Pöpke page 6 DFG-Projekte: Elektrokatalyse an Platin, Sauerstoffspeicherkatalysatoren

7 III. Example on SOFC electrodes 700 C C Kathodische Reduktion Anodische Oxidation Gesamtreaktion PhD thesis: Anne-Kathrin Huber, Hendrik Pöpke page 7 DFG-Projekte: Elektrokatalyse an Platin, Sauerstoffspeicherkatalysatoren

8 III. Example on SOFC electrodes 700 C C Kathodische Reduktion Anodische Oxidation Gesamtreaktion PhD thesis: Anne-Kathrin Huber, Hendrik Pöpke page 8 DFG-Projekte: Elektrokatalyse an Platin, Sauerstoffspeicherkatalysatoren

9 III. Example on SOFC electrodes: Electrode preparation Available techniques for sample preparation: PLD: dense thin film electrodes (nm range) PLD: dewetted electrodes (nm range) Metal or perovskite electrodes defined geometry and tpb-length epitaxial or single crystalline Metal electrodes large tpb-length single crystalline page 9

10 III. Example on SOFC electrodes: Electrode preparation Available techniques for sample preparation: Lithography: µ-electrodes (µm-range) Screen printing (mm-range) Metal or perovskite electrodes defined geometry and tpb-length eptaxial or single crystalline many electrodes in one preparation step Metal or perovskite electrodes large tpb-length close to technical application page 10

11 III. Example on SOFC electrodes: In situ analysis Available techniques for in situ analysis: (In situ) ESCA (XPS, SPEM): Yellow: Sr signal Segregation of SrO La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3+/- page 11

12 III. Example on SOFC electrodes: In situ analysis Available techniques for in situ analysis: (In situ) SIMS page 12

13 III. Example on SOFC electrodes: In situ analysis Available techniques for in situ analysis: (In situ) SEM O 2 evolution at Pt/YSZ interface Lithium deposition on solid electrolyte page 13

14 IV. Brief overview on metal hydrides for H 2 storage Effect of a carbon matrix on the thermodynamics and kinetics of hydrogen release and uptake from NaAlH 4 Chemistry of Materials, 2010, 22 (7), ; J. Phys. Chem. C, 2010, 114 (10), , Chem. Commun., 2009, 41, Hydrogen sorption in carbon supported Mg/Ni nanoparticles Nanotechnology, 2009, 20 (20), Impact of carbon materials, nanosize and confinement on hydrogen storage properties of light metal hydrides Chemsuschem, 2010, 3 (12) ; J. Mater. Chem., 2011, 21, page 14

15 Kontakt: AG Prof. Dr. Janek, Justus-Liebig-Universität Gießen Physikalisch-Chemisches Institut, Heinrich-Buff-Ring 58, Gießen Dr. Philipp Adelhelm page 15