Power-MEE Increasing Lifetime and Power Density of PEMWEs by High Performance Membrane Electrode Assemblies

Transcription

1 Power-MEE Increasing Lifetime and Power Density of PEMWEs by High Performance Membrane Electrode Assemblies Richard Hanke-Rauschenbach Leibniz Universität Hannover, Institute for Electric Power Systems on behalf of the Power-MEE consortium Spokesperson/contact: Simon Thiele, si.thiele(at)fz-juelich.de

2 Outline Introduction to the Power-MEE project Highlights Conclusion & Outlook 2

3 Project Idea of Power-MEE State of the art Power-MEE How can can we improve current materials? How can we improve conversion efficiency? How can we understand and prevent ageing? 3

4 Origin of POWER-MEE idea: Direct Membrane Deposition (DMD) for PEM Fuel Cells gas diffusion layer catalyst layer membrane Catalyst coated membrane (CCM) Fabrication methods Inkjet-Printing 1 Spray-coating 2 Drop-casting 3 [1] Klingele et al., Journal of Materials Chemistry A 3.21 (2015): [2] Klingele et al., Electrochemistry Communications (2016), 70, [3] Wehkamp et al., RSC Advances 6.29 (2016): Direct membrane deposition (DMD) 4

5 Origin of POWER-MEE idea: Direct Membrane Deposition (DMD) for PEM Fuel Cells Gore select (15 µm) 0.5/0.5 mg Pt /cm², H 2 /O 2, 0.5/0.5 l/min; 70 C, 100 % RH, 300/300 kpa abs Klingele et al., Journal of Materials Chemistry A 3.21 (2015): H 2 /O 2, 0.25/0.5 l/min, 80 C, 95 % RH, atmospheric pressure 5

6 POWER-MEE: Overall Aim and Project Team Investigate and develop high performance MEAs for PEM electrolysis Novel membrane materials (U Stuttgart/ICVT) Novel membrane manufacturing processes (U Freiburg/IMTEK) GDE catalyst layer manufacturing (Hahn- Schickard) Tomographic reconstruction and modeling (U Hannover, U Freiburg/IMTEK) Ageing protocols and testing (Fraunhofer ISE) 6

7 Outline Introduction to the Power-MEE project Highlights Conclusion & Outlook 7

8 Novel catalyst layer manufacturing methods: Spray-coating of IrO 2 on Ti-powder and fiber sinters Goals for electrode manufacturing PTE based approach Optimum low-loading layers Changing electrode morphology Cathode Carbon Pt-Catalyst PEM Anode PEM IrO 2 -Catalyst Titanium Final design of the DMD electrodes in POWER-MEE. 8

9 Novel catalyst layer manufacturing methods: Spray-coating of IrO 2 on Ti-powder and fiber sinters Porous transport layers: powder sinter (left) and fiber sinter (right) IrO 2 Ti-PTL 100 µm 100 µm Goal: a porous transport electrode with small/no holes to deposit the membrane on top 9

10 Novel catalyst layer manufacturing methods: Spray-coating of IrO 2 on Ti-powder and fiber sinters HFR free 2,2 Novel approach 1,8 Novel approach 2,0 Standardlayer IrO 2 Commercial benchmark 1,6 Standardlayer IrO 2 Novel approach - advanced 1,8 U in V 1,6 Novel approach - advanced U in V 1,4 Commercial benchmark 1,4 1,2 PTEs: 1.5 mg/cm 2 IrO 2 PTEs: 1.5 mg/cm 2 IrO 2 80 C, 1 bar 80 C, 1 bar Fiber sinter substrates Fiber sinter substrates 1, I in ma/cm 2 I in ma/cm 2 Our PTEs have only 1.5 mg/cm 2 IrO 2 compared to 2 mg/cm 2 IrO 2 in commercial benchmarks 10

11 Novel membrane manufacturing processes: Direct membrane deposition composite membranes N117 ~ 180 µm Sandwich ~ 180 µm N115 N212 Pt Interlayer ~ 200 µm N212 N212 + Pt + Nafion N115 N212 11

12 Tomographic reconstruction of catalyst layers: FIB-SEM tomographic procedure FuelCellsEtc EZ-CCM 12

13 Modeling support of material development FuelCellsEtc EZ CCM Anode catayst Anode Loading Resolution IrRuOx (unsupported) 3 mg/cm² 20 nm Field of view 29 µm x 24 µm x 7 µm

14 Modeling support of material development Usable for investigation of Degradation Manufacturing Process 14

15 Modeling support of material development 15

16 Outline Introduction to the Power-MEE project Highlights Conclusion & Outlook 16

17 POWER-MEE: Overall Aim and Project Team Investigate and develop high performance MEAs for PEM electrolysis Novel membrane materials (U Stuttgart/ICVT) Novel membrane manufacturing processes (U Freiburg/IMTEK) GDE catalyst layer manufacturing (Hahn- Schickard) Tomographic reconstruction and modeling (U Hannover, U Freiburg/IMTEK) Ageing protocols and testing (Fraunhofer ISE) Interested in testing our materials? Interested in a collaboration? Pleas contact us!

18 THANK YOU FOR YOUR INTEREST! Power-MEE Increasing Lifetime and Power Density of PEMWEs by High Performance Membrane Electrode Assemblies Richard Hanke-Rauschenbach Leibniz Universität Hannover, Institute for Electric Power Systems on behalf of the Power-MEE consortium Spokesperson/contact: Simon Thiele, si.thiele(at)fz-juelich.de