作者
Alin Orfanidi,Gregor S. Harzer,Pankaj Madkikar,Nicole Schulte,Philipp J. Rheinländer,Hany A. El‐Sayed,Hubert A. Gasteiger
摘要
In order to achieve platinum specific power densities of <0.1 g Pt /kW, which are required for the large-scale implementation of fuel cell electric vehicles (FCEVs) powered by proton exchange membrane fuel cells (PEMFCs), both the mass activity of the catalyst for the oxygen reduction reaction (ORR) and the high-current density performance of PEMFCs must be improved [1]. The latter strongly depends on the membrane electrode assembly (MEA) materials and design, for example: i) on the morphology of the catalyst support [2]; ii) on the distribution of the Pt nanoparticles on/within the primary particles of the carbon support [3,4]; iii) on the surface functionalization of the carbon support [5]; and, iv) on the ionomer distribution in the electrode, which is affected by the solvents used for catalyst ink preparation [6]. In this contribution, we will examine the influence of Pt nanoparticle distribution, carbon support surface modification, and various catalyst ink solvents on the high-current density performance of MEAs under differential flow conditions. This will be accompanied by fuel cell diagnostics (oxygen and proton transport resistance measurements in the cathode electrode) and by ex-situ characterization methods. References [1] A. Kongkanand, M. F. Mathias; J. Phys. Chem. Lett. 7 (2016) 1127. [2] V. Yarlagadda, M. K. Carpenter, T. E. Moylan, R. S. Kukreja, R. Koestner, W. Gu, L. Thompson, A. Kongkanand; ACS Energy Lett. 3 (2018) 618. [3] Y.-C. Park, H. Tokiwa, K. Kakinuma, M. Watanabe, M. Uchida; J. Power Sources 315 (2016) 179. [4] G. S. Harzer, A. Orfanidi, H. El-Sayed, P. Madkikar, H. A. Gasteiger; J. Electrochem. Soc. 165 (2018) F770. [5] A. Orfanidi, P. Madkikar, H. A. El-Sayed, G. S. Harzer, T. Kratky, H. A. Gasteiger; J. Electrochem. Soc. 164 (2017) F418. [6] A. Orfanidi, P. J. Rheinländer, N. Schulte, H. A. Gasteiger; J. Electrochem. Soc. 165 (2018) F1254.