Anchoring Black Phosphorus Quantum Dots on Fe‐Doped W<sub>18</sub>O<sub>49</sub> Nanowires for Efficient Photocatalytic Nitrogen Fixation
Guojun Dong, Xiaojuan Huang, Yingpu Bi
Abstract
Abstract Herein, we demonstrate that the surface anchoring of black phosphorus quantum dots (BPQDs) and bulk iron‐doping in W 18 O 49 nanowires significantly promotes the photocatalytic activity toward N 2 fixation into NH 3 . More specifically, a NH 3 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 W 18 O 49 (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 N 2 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 W 18 O 49 nanowires for NH 3 production.