Fig. 1. Schematic illustration of the gradient heating epitaxial growth process to prepare well lattice-matched Mo2C-Mo2N hetero-structure. Reprinted with permission from Ref. [8]. Copyright 2022, Wiley-VCH.

Fig. 2. (a) The diagrammatic sketch of the electrocatalytic water vapor splitting device based on the wood structure, the inset is the schematic illustration of the electrocatalytic water vapor splitting device configuration. (b) Photograph of the setup for the electrocatalytic steam splitting, insets are the photographs of setup before and after water splitting. (c) DOS curves of Mo2N, Mo2C, and Mo2C-Mo2N heterostructures. (d) The free energy diagram of HER on Mo2N, Mo2C, and Mo2C-Mo2N heterostructures under acid conditions. (e) The free energy diagram of HER on Mo2N, Mo2C, and Mo2C-Mo2N heterostructures under alkaline conditions. Reprinted with permission from Ref. [8]. Copyright 2022, Wiley-VCH.