Novel magneto-electrocatalyst Cr 2 CO 2 -MXene for boosting nitrogen reduction to ammonia.

Ammonia (NH 3 ) plays important roles in chemistry, the environment, and energy; however, the synthesis of NH 3 relies heavily on the Haber-Bosch process, causing serious environmental pollution and energy consumption. A clean and effective strategy for the synthesis of NH 3 involves nitrogen (N 2 ) being transformed to ammonia (NH 3 ) using electrocatalysis. Adjusting the magnetism of electrocatalysts may improve their performance, and therefore, four magnetic states, nonmagnetic (NM), ferromagnetic (FM), interlayer antiferromagnetic (Inter-AFM), and intra-layer antiferromagnetic (Intra-AFM) Cr 2 CO 2 -MXene were designed to explore magnetoelectrocatalysis performance using well-defined density functional theory (DFT) calculations in this study. Upon comparing the nitrogen reduction limiting potentials of N 2 molecules on the surface of the four different magnetic states in Cr 2 CO 2 -MXene, and the selectivity calculations of the hydrogen evolution reaction (HER) and nitrogen reduction reaction (NRR), the Inter-AFM Cr 2 CO 2 -MXene is shown to be a better NRR electrocatalyst than the other three cases. This study paves way to unravel the mystery of the spin-catalytic mechanism and will lay a solid foundation for eNRR electrocatalysts with magnetic materials for environmental and energy applications.