Efficient Electrocatalytic N2 Fixation with MXene under Ambient Conditions

？ 2D MXene is first used as an efficient electrocatalyst for nitrogen fixation ？ The optimized catalyst shows high faradic efficiency at an ultralow overpotential ？ A greater number of exposed edge sites are the main reason for higher activity ？ Poor HER activity of the host is essential to obtain an optimal MXene-based catalys