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Theses

Hollow nanoparticles for low cost, high oxygen reduction reaction activity and durability for proton exchange membrane fuel cell application

Abstract : This thesis investigates the mechanisms driving the formation, the en-hanced activity for the oxygen reduction reaction (ORR) and the dura-bility of porous hollow PtM/C nanoparticles (NPs) for proton exchange 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, in operando X-ray and electronic measurements, 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 parameter 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, rationalized by COads stripping measurments and Rietveld analysis. The non-noble metal was found to segregate faster than the structural defects during the accelerated stress tests.
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Submitted on : Monday, January 22, 2018 - 2:10:22 PM
Last modification on : Tuesday, December 7, 2021 - 2:14:06 PM
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  • HAL Id : tel-01689721, version 1

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Tristan Asset. Hollow nanoparticles for low cost, high oxygen reduction reaction activity and durability for proton exchange membrane fuel cell application. Mechanics of materials [physics.class-ph]. Université de Liège, 2017. English. ⟨NNT : 2017GREAI037⟩. ⟨tel-01689721⟩

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