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Ammonia is an essential chemical for producing fertilizers and energy carriers. However, the industrial Haber-Bosch process causes huge CO2 emissions and energy waste. As a promising alternative for Haber-Bosch process, electrochemical synthesis of ammonia has drawn much attention. Catalysts, as a vital part of electrochemical nitrogen reduction reaction (NRR), have developed rapidly in recent years. Compared to noble-metal catalysts, noble-metal-free catalysts possess a low-cost advantage. In this review, noble-metal-free catalysts, incl