MoZEES RA2 Hydrogen Components & T echnologies Magnus Thomassen Research Manager SINTEF RA2 leader - Anders Ødegård, Katie McCay, SINTEF - Ragnhild Hancke, IFE
Hydrogen Components & T echnologies • Objectives: – Contribute to reaching the 2025 targets (EU & DOE) for hydrogen production, storage and fuel cells for the transport sector. – Improve understanding of degradation/lifetime phenomena to improve durability and performance – Lower cost and higher efficency of fuel cells and electrolysers • Focus Areas: – Reduced materials and operating costs as well as increased manufacturability of components – Maritime applications, rules, regulations and maritime environments.
RA2 Research Tasks • Task 2.1 – High performance catalysts • Task 2.2 – Low cost bipolar plates • Task 2.3 – Low cost, high performance membranes • Task 2.4 – Lifetime, durability and performance • Task 2.5 – Hydrogen storage tanks
Task 2.4 In-plane Neutron Imaging of PEM Water Electrolysis Cell 0.5 A/cm 2 2.5 A/cm 2 Further image processing is necessary to yield quantified images and enable a careful study of water/gas distribution in the porous layers • Corrections for neutron scattering based on black body measurments • Beer- Lambert’s law to go from the relative attenuation to the quantified image: 𝑒 = 1 𝐽 𝐽 0 . − Σ 𝑚𝑜 4
Task 2.2 – Low cost bipolar plates • Objective : – Low cost coating materials and processes, e.g. composite coatings with conductive metals, graphite or oxides for fuel cells and electrolyzers. • Research Method: – Establish robust and scalable deposition/coating methods based on materials developed within the centre. – Evaluate performance and durability of coatings ex and in situ. – Post-mortem analysis of effluents and corrosion products – Testing single cells and short stacks with bipolar plates using infrastructure in the Norwegian FCH Center
Polarisation curves of Powercell S2 stack measured by SINTEF at the NFCH
Fuel cell loss break down https://doi.org/10.1016/j.jpowsour.2017.01.059
PEM Fuel cell single cell
Teer Coatings’ Technology Batch and inline coating equipment, capable of depositing coatings on bipolar plates. Batch coating equipment Inline coating equipment
On-line ICR method ICR Cathode BPP 10
On-line ICR method 11
Gold coated vs uncoated – online ICR • Uncoated ~18 mohm cm 2 • Gold ~2 mohm cm 2 • ~ 5% Fuel Cell efficiency increase. In situ contact resistances of cells using gold coated and uncoated stainless steel bipolar plates during polarisation curve. 14
Long Term In-situ BPP Testing • BPPs from Teer Coatings – Carbon coated SS316 steel • Testing protocol: – Initially: • Impedance, polarisation curve, humidity and temperature cycle The single cell mounted on a test station – Drive Cycles • Sets of 50, followed by a polarisation curve and EIS • Each set of 50 drive cycles takes 17 hours • After 500 cycles, cell is shut down, recovery protocol • Total of 6 000 cycles will be performed • Total test period > 85 days 15 A single drive cycle and a standard voltage response
Ongoing Performance – Polarisation Curves Performance recovery after shut down 16
Ongoing Performance - EIS 17
Conclusions and outlook • In-situ measurement contact resistance technique well established – Accelerated test protocols • New coatings developed by MoZEES user partner showing good initial performance • Results will be analysed together with ex-situ characterization of BPP at EoT. • Methodology ready for further tests of new coating solutions • Potential for expansion to PEM electrolyser cells
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