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Issue 39, 2018, Issue in Progress
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Facile and scalable synthesis of sub-micrometer electrolyte particles for solid acid fuel cells

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Abstract

Nanostructuring fuel cell electrodes is a viable pathway to reach high performance with low catalyst loadings. Thus, in solid acid fuel cells, small CsH2PO4 electrolyte particles are needed for the composite powder electrodes as well as for thin electrolyte membranes. Previous efforts have resulted in significant improvements in performance when using sub-micrometer CsH2PO4 particles, but laborious methods with low throughput were employed for their synthesis. In this work, we present a simple, robust, and scalable method to synthesize CsH2PO4 particles with diameters down to below 200 nm. The method involves precipitating CsH2PO4 by mixing precursor solutions in alcohol in the presence of a dispersing additive. The influence of the concentrations, the batch size, the solvent, and the mixing process is investigated. The particle size decreases down to 119 nm with increasing amount of dispersing additive. Mixing in a microreactor leads to a narrower particle size distribution. The particle shape can be tuned by varying the solvent. The ionic conductivity under solid acid fuel cell conditions is 2.0 × 10−2 S cm−1 and thus close to that of CsH2PO4 without dispersing additive.

Graphical abstract: Facile and scalable synthesis of sub-micrometer electrolyte particles for solid acid fuel cells

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Publication details

The article was received on 17 Apr 2018, accepted on 29 May 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8RA03293A
RSC Adv., 2018,8, 21806-21815
  • Open access: Creative Commons BY license
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    Facile and scalable synthesis of sub-micrometer electrolyte particles for solid acid fuel cells

    F. P. Lohmann-Richters, C. Odenwald, G. Kickelbick, B. Abel and Á. Varga, RSC Adv., 2018, 8, 21806
    DOI: 10.1039/C8RA03293A

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