Effective separation and transfer of carriers into the redox sites on Ta3N5/Bi photocatalyst for promoting conversion of CO2 into CH4
Effective separation and transfer of carriers into the redox sites on Ta3N5/Bi photocatalyst for promoting conversion of CO2 into CH4
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有效分离载流子并将其转移到 Ta3N5/Bi 光催化剂上的氧化还原位点，促进 CO2 转化为 CH4
DOI：
10.1016/j.apcatb.2017.10.043
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发表时间：
2018-05
期刊：
影响因子：
--
通讯作者：
Zou Zhigang
中科院分区：
文献类型：
--
作者：
Wang Shaomang;Guan Yuan;Lu Lei;Shi Zhan;Yan Shicheng;Zou Zhigang
提高载体的分离效率和抑制逆反应是实现阳光驱动下H2O作为还原剂将co2高效转化为CH4的关键挑战。本文提出用低功函数的金属Bi修饰型Ta3N5，从而构建Ta3N5/Bi的欧姆结光催化剂。与Ta3N5相比，ch4产率提高了约5倍。增强的光催化活性可归因于以下两个作用：(1)结电场驱动ta3n5的导带电子向Bi的注入，大大提高了载流子的分离效率；(2)在ta3n5和Bi上分别构建了氧化还原反应位点，有效分离了H2O的氧化反应和CO2的还原反应，明显抑制了ch4生成过程中的逆反应。
Improving separation efficiency of carriers and inhibiting the inverse reaction are key challenges for achieving efficient sunlight driven conversion of CO2by H2O as reducing agent into CH4. Here, we proposed using metal Bi with low work function to modifyn-type Ta3N5, thus building an ohmic junction photocatalyst of Ta3N5/Bi. It achieved an about 5 times increase in CH4yield compared with Ta3N5. The enhanced photocatalytic activity was ascribed to the following two effects: (1) The junction electric field drove the injection of conduction-band electrons of Ta3N5to Bi, greatly improving separation efficiency of carriers; (2) The oxidation and reduction reaction sites were respectively constructed over Ta3N5and Bi, effectively separating the oxidation reaction of H2O and the reduction reaction of CO2, which distinctly suppressed the reverse reaction during CH4generation.
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DOI：
10.1002/chin.201529262
发表时间：
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期刊：
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