Fig. 4: Extension of proposed MEA-FR design to an electrolyzer stack for NH3 synthesis. | Nature Communications

Fig. 4: Extension of proposed MEA-FR design to an electrolyzer stack for NH3 synthesis.

From: Full runner electrolyzer stack for industrial-current-density NOx−-mediated ammonia synthesis from air and water

Fig. 4

a The distribution and parallel flow of electrolytes in the MEA-FR electrolyzer stack. b Photographs of a 4 × 25 cm2 MEA-FR electrolyzer stack with four modular units. c Stack voltage-dependent voltage distribution and total electrolysis current. Cx represents the cell and the cell’s respective number. 1 M KOH solutions with or without 0.1 M NO3− were used under single-pass flow operation as catholyte and anolyte, respectively. d NH3 FE at different stack voltages. e The total electrolysis current and NH3 FE for a stability test at a 9 V stack voltage. Each cycle starts with 40 L of 1 M KOH containing 0.1 M NO3− as the catholyte and 3 M KOH as the anolyte. All voltages are reported without iR correction. Source data are provided as a Source Data file.

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