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Bismuth Subcarbonate with Designer Defects for Broad-Spectrum Photocatalytic Nitrogen Fixation
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1021/acsami.8b05925 Chenmin Xu , Pengxiang Qiu , Liyuan Li 1 , Huan Chen , Fang Jiang , Xin Wang
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1021/acsami.8b05925 Chenmin Xu , Pengxiang Qiu , Liyuan Li 1 , Huan Chen , Fang Jiang , Xin Wang
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A facial hydrothermal method is applied to synthesize bismuth subcarbonate (Bi2O2CO3, BOC) with controllable defect density (named BOC-X) using sodium bismuthate (NaBiO3) and graphitic carbon nitride (GCN) as precursors. The defects of BOC-X may originate from the extremely slow decomposition of GCN during the hydrothermal process. The BOC-X with optimal defect density shows a photocatalytic nitrogen fixation amount of 957 μmol L–1 under simulated sunlight irradiation within 4 h, which is 9.4 times as high as that of pristine BOC. This superior photocatalytic performance of BOC-X is attributed to the surface defect sites. These defects in BOC-X contribute to a defect level in the forbidden band, which extends the light-harvest region of the photocatalyst from the ultraviolet to the visible-light region. Besides, surface defects prevent electron–hole recombination by accommodating photogenerated electrons in the defect level to promote the separation efficiency of charge carrier pairs. This work not only demonstrates a novel and scalable strategy to synthesize defective Bi2O2CO3 but also presents a new perspective for the synthesis of photocatalysts with controllable defect density.
中文翻译：
具有设计缺陷的碱式碳酸氢铋用于广谱光催化固氮
面部水热方法应用于合成碱式碳酸铋的（Bi 2 ö 2 CO 3，BOC）具有可控的缺陷密度（名为BOC- X使用铋酸钠（NABIO）3）和石墨氮化碳（GCN）作为前体。BOC- X的缺陷可能源于在水热过程中GCN的分解非常缓慢。具有最佳缺陷密度的BOC- X在模拟的阳光照射下4小时内显示出957μmolL –1的光催化固氮量，是原始BOC的9.4倍。BOC- X的这种出色的光催化性能归因于表面缺陷部位。BOC- X中的这些缺陷导致了禁带中的缺陷水平，该禁带使光催化剂的光捕获区域从紫外线延伸到可见光区域。此外，表面缺陷通过以缺陷水平容纳光生电子来提高电荷载流子对的分离效率，从而防止电子-空穴复合。这项工作不仅证明了合成有缺陷的Bi 2 O 2 CO 3的新颖且可扩展的策略，而且为合成具有可控制的缺陷密度的光催化剂提供了新的视角。
更新日期：2018-07-03
中文翻译：
具有设计缺陷的碱式碳酸氢铋用于广谱光催化固氮
面部水热方法应用于合成碱式碳酸铋的（Bi 2 ö 2 CO 3，BOC）具有可控的缺陷密度（名为BOC- X使用铋酸钠（NABIO）3）和石墨氮化碳（GCN）作为前体。BOC- X的缺陷可能源于在水热过程中GCN的分解非常缓慢。具有最佳缺陷密度的BOC- X在模拟的阳光照射下4小时内显示出957μmolL –1的光催化固氮量，是原始BOC的9.4倍。BOC- X的这种出色的光催化性能归因于表面缺陷部位。BOC- X中的这些缺陷导致了禁带中的缺陷水平，该禁带使光催化剂的光捕获区域从紫外线延伸到可见光区域。此外，表面缺陷通过以缺陷水平容纳光生电子来提高电荷载流子对的分离效率，从而防止电子-空穴复合。这项工作不仅证明了合成有缺陷的Bi 2 O 2 CO 3的新颖且可扩展的策略，而且为合成具有可控制的缺陷密度的光催化剂提供了新的视角。
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