| 锌掺杂BiOBr合成及可见光下对CO2光催化还原机理 |
| Synthesis of Zn-Doped BiOBr with Enhanced Photoreduction CO2 Activity under Visible Light Irradiation |
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| 摘要: 溴氧化铋（BiOBr）半导体已被应用于光催化CO2还原，但其活性仍然极低。通过简单的水热法合成了Zn-BiOBr光催化剂，并在可见光照射下研究其对CO2催化效果。结果表明，合成的Zn-BiOBr样品在可见光照射下具有比原BiOBr更高的光催化还原CO2转化活性，其对CO2光催化还原速率最高可达到8.49 μmol·h-1，是原BiOBr的13倍。同时，我们亦对光催化活性增强机理进行了研究，发现在可见光照射下，Zn-BiOBr半导体被激发，产生光致电子空穴对，光诱导电子有效还原CO2，生成CO。锌的掺杂为BiOBr提供了更合适的带边位置和能带缺陷，降低了光生电子与空穴对的复合速率，大大提高了光催化还原CO2的能力。 |
| 关键词: Zn-BiOBr 半导体 光催化剂 二氧化碳还原 可见光 能量储存和转换 |
| 基金项目: 国家自然科学基金（No.21103095）、福建省高校杰出青年科研人才培育计划（No.MJK2018-31-158）、福建省环境监测高校重点实验室开发课题项目（No.HJJC1903）和福建省教育厅中青年教师教育科研项目（No.JAT191004）资助。 |
| Abstract: The bismuth oxybromide (BiOBr) semiconductor has been used in photocatalytic CO2 reduction for a long time, but the catalytic activity remains low. Herein, the Zn-doped BiOBr photocatalysts (called Zn-BiOBr) was synthesized by a simple hydrothermal method, which put out higher catalytic activity than pure BiOBr under visible light. The results showed that the synthesized 2% Zn-BiOBr exhibited the highest photocatalytic rate of 8.49 μmol·h-1, which was 13 times higher than pure BiOBr. The enhancement mechanism of photocatalytic activity was also studied. Under visible light, Zn-BiOBr catalyst is excited and creates photo-induced electrons and holes, which effectively improve the conversion of CO2 into CO. Doping of zinc provides BiOBr with a more suitable band gap and energy band defects, facilitates the separation of photogenerated charges, and reduces the recombination rate of photogenerated electrons, all of which contribute to the CO2 conversion efficiency. |
| Keywords: Zn-doped BiOBr semiconductors photocatalyst CO2 reduction visible light energy storage and conversion |
| 投稿时间：2020-06-06 修订日期：2020-09-17 |
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| 许丽梅,黄华斌,沈金海,游其华.锌掺杂BiOBr合成及可见光下对CO2光催化还原机理[J].无机化学学报,2020,36(12):2395-2403. |
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