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(A) Gas-solid-liquid three-phase interface model in aqueous electrolytes. (B) Liquid-solid two-phase interface model in nonaqueous electrolytes. [From F. Cheng, J. Chen, Metal–air batteries: From oxygen reduction electrochemistry to cathode catalysts. Chem. Soc. Rev. 41, 2172–2192 (2012). Reprinted with permission from the Royal Society of Chemistry.]
