Institute of Engineering Thermodynamics, German Aerospace Center (DLR), Carl-von-Ossietzky-Str. 15, 26129, Oldenburg, Germany.
School of Chemistry, The University of New South Wales, Sydney, New South Wales, 2052, Australia.
ChemSusChem. 2023 Mar 8;16(5):e202202046. doi: 10.1002/cssc.202202046. Epub 2023 Jan 18.
Pt poisoning by phosphate in high temperature proton exchange membrane fuel cells (HT-PEMFC) leads to loadings up to 1 mg cm per electrode of costly materials. While cheaper Fe-N-C catalysts are unaffected by phosphate deactivation and contribute to the catalysis of the oxygen reduction reaction, their volumetric activity is substantially lower. In this study, the effect of Pt-loading reduced hybrid cathodes for HT-PEMFC is investigated using commercial Celtec®-P-based assembling. A promising effect of Fe-N-C incorporation in terms of acid attraction and activity retention is found. A longer activation (230 h, 0.3 A cm ) for the hybrid membrane electrode assembly (MEA) is necessary, due to the slower acid distribution within Fe-N-Cs. This study shows the potential of Pt-content reduction by up to 25 % compared to standard MEA using hybrid electrodes. Moreover, important insights for future strategies of cell activation are revealed for these hybrid MEAs.
高温质子交换膜燃料电池（HT-PEMFC）中磷酸盐引起的铂中毒会导致每个电极的昂贵材料的负载量高达 1mg/cm。虽然更便宜的 Fe-N-C 催化剂不受磷酸盐失活的影响，并有助于氧还原反应的催化，但它们的体积活性要低得多。在这项研究中，使用商业 Celtec®-P 基组装研究了 HT-PEMFC 用 Pt 负载量降低的混合阴极的效果。发现 Fe-N-C 的掺入在酸吸引和活性保持方面具有很有前景的效果。由于 Fe-N-C 内的酸分布较慢，因此需要更长的混合膜电极组件（MEA）的激活时间（230 小时，0.3 A/cm）。与使用标准 MEA 相比，该研究表明使用混合电极可将 Pt 含量降低多达 25%。此外，还揭示了这些混合 MEA 中电池激活的未来策略的重要见解。
