Reference : Hollow Nanoparticles for Low Cost, High Activity and Durability for the Oxygen Reduct...
Dissertations and theses : Doctoral thesis
Engineering, computing & technology : Energy
Hollow Nanoparticles for Low Cost, High Activity and Durability for the Oxygen Reduction Reaction for Fuel Cell Applications
[fr] Particules creuses peu onéreuses, durables et actives pour la réduction de l'oxygène dans le cadre d'une application en pile à combustible à membrane échangeuse de protons
Asset, Tristan mailto [Université de Liège - ULiège > > > Doct. sc. ingé. & techno. (chimie appl. - paysage)]
Université de Liège, ​Liège, ​​Belgique
Job, Nathalie mailto
[en] This Ph.D. thesis investigates the mechanisms driving the formation, the enhanced activity for the oxygen reduction reaction (ORR) and the durability of porous hollow PtM/C nanoparticles (NPs) for proton ex-change membrane fuel cell (PEMFC) applications. The formation and growth of the NPs, synthesized by a ‘one-pot’ process, were discussed in the light of microscopic, operando X-ray and electron-based tech-niques, unveiling the different intermediate steps of the synthesis. The synthe-sis process was extended to different non-noble metals (M = Ni, Co, Cu, Zn and Fe) and to different carbon supports. The enhanced activity for the ORR resulted from (i) the contraction of the lattice pa-rameter by the non-noble metal (the final NPs contains ca. 15 – 20 at. % of M), (ii) the open porosity and (iii) the density of structural defects at the surface of the NPs, which was semi-quantitativey estimated by COads stripping measurements and Rietveld analysis of wide-angle X-ray scattering patterns. The non-noble metal was found to be annealed (dissolved) faster than the structural defects during the accelerated stress tests.

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