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SUMMARY:Operando mapping of morphology\, phase transformations\, and curre
 nt patterns in energy devices by advanced neutron imaging and diffraction
DTSTART:20260608T123000Z
DTEND:20260608T133000Z
DTSTAMP:20260527T193500Z
UID:indico-event-647@indico.frm2.tum.de
CONTACT:Nicolas.Walte@frm2.tum.de\;d.saha@fz-juelich.de
DESCRIPTION:Speakers: Luise Theil Kuhn (DTU Energy\, Technical University 
 of Denmark)\n\nA core activity in the ESS Lighthouse Hard Materials in 3D\
 , SOLID (https://solid.dtu.dk/)\, has been to develop advanced neutron ima
 ging methods for operando analysis of microstructure\, phase transformatio
 ns\, and current patterns in energy devices. Here\, I will present two cas
 es where we have investigated the battery cell degradation of Na-ion batte
 ries while being charged and discharged\, and the current pattern formatio
 n in a proton exchange membrane water electrolysis (PEMWE) cell under oper
 ation.Na-ion batteries are one of the promising next-generation battery te
 chnologies since they can deliver a capacity comparable to Li-ion batterie
 s while constituting cheap\, non-flammable\, and sustainable materials. Ho
 wever\, the chemical and mechanical stability during cycling is a challeng
 e. The Na-ion battery is inherently difficult to directly image as Na has 
 a very low X-ray and neutron scattering cross-section and can’t sustain 
 post-mortem disassembly and analysis. At the SENJU beamline at J-PARC\, we
  have successfully performed the first multimodal operando neutron studies
  combining time-of-flight diffraction and Bragg edge imaging to investigat
 e the microstructural changes and phase transformations of the battery ele
 ctrodes and link them to the electrochemically active regions.PEMWE cells 
 are considered one of the key technologies for sustainable hydrogen produc
 tion. PEMWE can be operated under relatively flexible conditions\, making 
 them ideal for varying electricity production by e.g. wind turbines or sol
 ar cells. A central component is the porous transport layer (PTL)\, which 
 is used for managing the distribution of water and release of produced gas
 es. The PTL is subject to a very harsh environment and is often based on T
 i coated with Pt or Ir. The morphology of the PTL is crucial for the perfo
 rmance of the PEMWE since this is directly linked to the oxygen bubble for
 mation and the current pattern formation in the cell. At the RADEN beamlin
 e at J-PARC and NeXT at ILL\, we have performed the first polarized neutro
 n imaging studies of the current pattern formation in the PEMWE cell under
  operation while linking it to the electrochemical performance with differ
 ent types of PTLs.Neutron flux is the main limitation in operando neutron 
 imaging\, and I’ll finish by presenting our first steps towards overcomi
 ng this by implementing a real neutron microscope with a condenser based o
 n Wolter optics and a Fresnel zone plate-based objective.\n\nhttps://indic
 o.frm2.tum.de/event/647/
LOCATION:PH HS 3 (Physics Department)
URL:https://indico.frm2.tum.de/event/647/
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