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Electrochemical N₂ reduction reaction (NRR) has emerged as the most effective alternative to the conventional Haber-Bosch process for N₂ fixation. Although NRR is only used in the synthesis of NH₃, researchers have recently exploited it in Metal-N₂ batteries (hereafter, M-N₂ batteries) to kill two birds with one stone by fixing N₂ and generating electricity at the same time. There are three types of electrochemical energy storage approaches, namely rechargeable with irreversible electrochemical reaction (under aqueous or non-aqueous conditions), non-rechargeable with irreversible electrochemical reaction (under aqueous conditions), and rechargeable with reversible electrochemical reaction (under non-aqueous conditions). However, the hydrogen evolution reaction (HER) in an aqueous medium takes precedence over the NRR, resulting in a poor Faradic efficiency (FE) for the NRR selectivity. This obvious but …