article published yes Stefan Alexander Freunberger author A8CA28E6-CE23-11E9-AD2D-EC27E66974250000-0003-2902-5319 Mathias Reum author Alexander Wokaun author Felix N. Büchi author A novel measurement principle for measuring the current distribution in polymer electrolyte fuel cells (PEFCs) is introduced. It allows, in contrast to all other known techniques, for the first time for a resolution smaller than the channel/rib scale of the flow field in PEFCs. The current density is obtained by considering the electron conductors in the cell as a two-dimensional resistor with the voltage drop caused by the current. The method was applied to a cell operated on oxygen up to high current densities. The results show that the ohmic resistances govern the current distribution in the low current regime, whereas mass transport limitations hamper the current production under the land at high loads. Elsevier2006 eng 1388-248110.1016/j.elecom.2006.05.032 891435-1438 yes Freunberger, Stefan Alexander, et al. “Expanding Current Distribution Measurement in PEFCs to Sub-Millimeter Resolution.” <i>Electrochemistry Communications</i>, vol. 8, no. 9, Elsevier, 2006, pp. 1435–38, doi:<a href="https://doi.org/10.1016/j.elecom.2006.05.032">10.1016/j.elecom.2006.05.032</a>. S. A. Freunberger, M. Reum, A. Wokaun, and F. N. Büchi, “Expanding current distribution measurement in PEFCs to sub-millimeter resolution,” <i>Electrochemistry Communications</i>, vol. 8, no. 9. Elsevier, pp. 1435–1438, 2006. Freunberger, S. A., Reum, M., Wokaun, A., &#38; Büchi, F. N. (2006). Expanding current distribution measurement in PEFCs to sub-millimeter resolution. <i>Electrochemistry Communications</i>. Elsevier. <a href="https://doi.org/10.1016/j.elecom.2006.05.032">https://doi.org/10.1016/j.elecom.2006.05.032</a> Freunberger SA, Reum M, Wokaun A, Büchi FN. Expanding current distribution measurement in PEFCs to sub-millimeter resolution. <i>Electrochemistry Communications</i>. 2006;8(9):1435-1438. doi:<a href="https://doi.org/10.1016/j.elecom.2006.05.032">10.1016/j.elecom.2006.05.032</a> Freunberger SA, Reum M, Wokaun A, Büchi FN. 2006. Expanding current distribution measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications. 8(9), 1435–1438. S.A. Freunberger, M. Reum, A. Wokaun, F.N. Büchi, Electrochemistry Communications 8 (2006) 1435–1438. Freunberger, Stefan Alexander, Mathias Reum, Alexander Wokaun, and Felix N. Büchi. “Expanding Current Distribution Measurement in PEFCs to Sub-Millimeter Resolution.” <i>Electrochemistry Communications</i>. Elsevier, 2006. <a href="https://doi.org/10.1016/j.elecom.2006.05.032">https://doi.org/10.1016/j.elecom.2006.05.032</a>. 73292020-01-15T12:23:22Z2021-01-12T08:13:06Z