Anchoring Black Phosphorus Quantum Dots on Fe‐Doped W18O49 Nanowires for Efficient Photocatalytic Nitrogen Fixation

Herein, we demonstrate that the surface anchoring of black phosphorus quantum dots (BPQDs) and bulk iron-doping in W18 O49 nanowires significantly promotes the photocatalytic activity toward N2 fixation into NH3 . More specifically, a NH3 production rate of up to 187.6 μmol g-1 h-1 could be achieved, nearly one order of magnitude higher than that of pristine W18 O49 (18.9 μmol g-1 h-1 ). Comprehensive experiments and density-functional theory calculations reveal that Fe-doping could enhance the reducing ability of photo-generated electrons by decreasing the work function and elevating the defect band (d-band) centers. Additionally, the surface BPQDs anchoring could facilitate the N2 adsorption/activation owing to the increased adsorption energy and advantaged W-P dimer bonding-mode. Therefore, synergizing the surface BPQD anchoring and bulk Fe-doping remarkably enhanced the photocatalytic activity of W18 O49 nanowires for NH3 production.