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A unique atomic dispersed hetero-pair was successfully synthesized, consisting of Mo-Fe di-atoms anchored on N-doped carbon carrier.This strategy breaks the linear scaling relationships of electrocatalytic CO2reduction by simultaneously regulating the *COOH adsorption energy and *CO desorption energy.The as-prepared MoFe–N–C exhibits excellent performance for CO2RR to CO with a high turnover frequency (TOF) of 3336.21 h−1, CO Faradaic efficiency (FECO) of 95.96% at − 0.60 V (versus RHE) and outstanding stability.

Seeking catalysts with high electrocatalytic activity for ambient-condition N2reduction reaction (NRR) remains an ongoing challenge due to the chemical inertness of N2. Herein, defect-rich WS2nanosheets (WS2−x) were designed as an efficient electrocatalyst for NRR, which were prepared viavulcanizing the oxygen-vacancy-rich tungsten oxide in a vacuum tube. The sulfur defects were conducive to the adsorption and activation of N2. In neutral electrolyte of 0.1 mol L−1Na2SO4at −0.60 V vs.reversible hydrogen electrode, such WS2−xoffered a high Faradaic efficiency of 12.1% with a NH3generation rate of 16.38 µg h−1mgcat−1.

MXene-based materials were suggested to be promising candidates for electrocatalytic nitrogen reduction due to their exceptional properties