Homogeneously Nitrogen Doped BaLa4Ti4O15 Extending Visible Light Responsive Range for Photocatalytic Oxygen Evolution
Homogeneously Nitrogen Doped BaLa4Ti4O15 Extending Visible Light Responsive Range for Photocatalytic Oxygen Evolution
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DOI：
10.1021/acsmaterialslett.2c00988
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发表时间：
2022-12
影响因子：
11.4
通讯作者：
Yuyang Kang;Lei Wang;Xiaoxiang Xu;Xingwu Chen;Lianzhou Wang;Gang Liu
中科院分区：
文献类型：
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作者：
Yuyang Kang;Lei Wang;Xiaoxiang Xu;Xingwu Chen;Lianzhou Wang;Gang Liu
均匀氮掺杂是在不改变前驱体晶体结构和微观结构的情况下缩小层状金属氧化物带隙的一种很有前途的策略。BaLa4Ti4O15是一种带隙约为3.77 eV的（111）平面层状钙钛矿金属氧化物，在氨气气氛中进行了氮掺杂热处理。氮掺杂剂均匀分布在层状钙钛矿框架中，导致可见光吸收边延伸至600 nm，对应的带隙为2.07 eV。值得注意的是，氮掺杂工艺对BaLa4Ti4O15的晶体结构、微观结构和化学状态的影响很小，最大限度地减少了光生载流子分离和表面化学反应的副作用。bala4ti4o15 - xny在可见光下表现出高效的光催化水氧化活性。这项工作强调了均匀掺杂对调谐宽带隙层状金属氧化物的有用性。
Homogeneous nitrogen doping is a promising strategy for narrowing the band gap of layered metal oxides without altering the crystal structures and microstructures of precursors. In this work, BaLa4Ti4O15, a (111) plane-type layered perovskite metal oxide with a band gap of about 3.77 eV, was doped with nitrogen by a thermal treatment in an ammonia atmosphere. The nitrogen dopants are homogeneously distributed in the layered perovskite framework, resulting in an extended band-to-band visible light absorption edge up to 600 nm, corresponding to a band gap of 2.07 eV. It is worth noting that the nitrogen doping process has trivial impact on the crystal structure, microstructure, and chemical states of the BaLa4Ti4O15, which minimizes the side effect of photogenerated carrier separation and surface chemical reaction. BaLa4Ti4O15–xNyexhibited efficient photocatalytic water oxidation activity under visible light. This work highlights the usefulness of homogeneous doping for tuning wide band gap layered metal oxides.