Anchoring Black Phosphorus Quantum Dots on Fe-Doped W18O49 Nanowires for Efficient Photocatalytic Nitrogen Fixation
Anchoring Black Phosphorus Quantum Dots on Fe-Doped W18O49 Nanowires for Efficient Photocatalytic Nitrogen Fixation
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DOI：
10.1002/anie.202204271
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发表时间：
2022-06-07
影响因子：
16.6
通讯作者：
Bi, Yingpu
中科院分区：
文献类型：
--
作者：
Dong, Guojun;Huang, Xiaojuan;Bi, Yingpu
在此，我们证明了黑磷量子点（BPQDs）的表面锚定和大量的铁掺杂在W18 O 49纳米线显着促进光催化活性对N-2固定到NH3。更具体地，可以实现高达187.6 μ mol g（-1）h（-1）的NH3产生速率，比原始W18 O 49的NH3产生速率（18.9 μ mol g（-1）h（-1））高近一个数量级。综合实验和密度泛函理论计算表明，Fe掺杂可以通过降低功函数和提高缺陷带（d带）中心来增强光生电子的还原能力。此外，由于吸附能增加和有利的W-P二聚体键合模式，BPQD表面锚定可以促进N2的吸附/活化。因此，协同BPQD的表面锚定和体Fe掺杂显着提高了W18 O 49纳米线的光催化活性为NH3的生产。
Herein, we demonstrate that the surface anchoring of black phosphorus quantum dots (BPQDs) and bulk iron-doping in W18O49 nanowires significantly promotes the photocatalytic activity toward N-2 fixation into NH3. More specifically, a NH3 production rate of up to 187.6 mu mol g(-1) h(-1) could be achieved, nearly one order of magnitude higher than that of pristine W18O49 (18.9 mu mol 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 W18O49 nanowires for NH3 production.