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Electrochemical N2 fixation: (a) electrochemical nitrogen cycle; (b) reaction mechanism of nitrogen electroreduction in aqueous electrolyte.71 (c) high-temperature Li-mediated N2 electroreduction in molten lithium hydroxide;68 room-temperature Li-mediated N2 electroreduction in an organic electrolyte using ethanol72 (d) or phosphonium cation (e) as the proton source.73
