Electrochemical nitrogen reduction reaction (NRR) under mild conditions is an attractive prospect for ammonia synthesis. However, this process faces with poor ammonia yield rate and low Faradic efficiency. Herein, we developed exfoliated metallic niobium disulfate (NbS₂) nanosheets for an electrochemical NRR. Owing to more exposed active sites and high electron transfer ability, the exfoliated NbS₂ nanosheets show an extraordinary activity for electrochemical NRR. A high Faradaic efficiency of 10.12% with an ammonia yield rate of 37.58 μg h^-1 mg^-1_cat is achieved at -0.5 V versus reversible hydrogen electrode (RHE). The Nb⁴⁺ species of exfoliated NbS₂ are confirmed as active sites for NRR. When the exfoliated NbS₂ nanosheets are further assembled into a Zn-N₂ battery and serve as the cathode, an energy density of 714 mA h g^-1 with a power density of 0.31 mW cm^-2 is achieved. Notably, electrochemical NRR on exfoliated NbS₂ nanosheets can be further driven by solar energy.

温和条件下的电化学氮还原反应（NRR）是合成氨的诱人前景。但是，该方法面临着氨产率低和法拉第效率低的问题。在这里，我们开发了用于电化学NRR的片状金属二硫化铌（NbS ₂）纳米片。由于更多的暴露活性位和高电子转移能力，剥落的NbS ₂纳米片对电化学NRR具有非凡的活性。与可逆氢电极（RHE）相比，在-0.5 V时可实现10.12％的高法拉第效率和37.58μgh ^-1  mg ^-1 _cat的氨产率。Nb ⁴⁺脱落的NbS ₂物种被确认为NRR的活跃站点。当将剥离的NbS ₂纳米片进一步组装成Zn-N ₂电池并用作阴极时，获得了714 mA hg ^-1的能量密度和0.31 mW cm ^-2的功率密度。值得注意的是，剥离的NbS ₂纳米片上的电化学NRR可以进一步由太阳能驱动。