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. 2018 Mar 23;4(3):eaar7180. doi: 10.1126/sciadv.aar7180

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — Performance obtained under (A) air and (B) O₂ for the 4.0-mg/cm² CCL design with 35 or 40 wt % ionomer. (C) Performance (corrected for ohmic losses) obtained under O₂ (inset shows performance achieved at 0.044 A/cm²).