Activating Transition Metal Dichalcogenides by Substitutional Nitrogen‐Doping for Potential ORR Electrocatalysts

Abstract One of the challenging goals in the large‐scale realization of hydrogen‐based fuel cells is to replace or minimize the use of expensive Pt‐based electrocatalysts to reduce molecular oxygen at the cathode. Recently, non‐metal doped nanosheets of transition metal dichalcogenides (TMDs) have emerged as a promising Pt‐free electrocatalyst for hydrogen evolution reaction. Herein, we investigate the potential of nitrogen‐ and phosphorus‐ (N‐ and P‐) doped TMDs (MoS2, MoSe2, WS2, and WSe2) as high‐performing electrocatalysts for ORR using first principle calculations, motivated by recent experimental advances to incorporate single S/Se vacancies on the surface of TMD monolayers using electrochemical methods. We observed a strong hybridization of p‐orbitals of N/P atom with the p‐ and d‐orbitals of neighbouring S/Se and Mo/W atoms, respectively, activating pristine TMDs by increasing de…