One-step synthesis and Gd3+ decoration of BiOBr microspheres consisting of nanosheets toward improving photocatalytic reduction of CO2 into hydrocarbon fuel
One-step synthesis and Gd3+ decoration of BiOBr microspheres consisting of nanosheets toward improving photocatalytic reduction of CO2 into hydrocarbon fuel
复制标题
由纳米片组成的 BiOBr 微球的一步合成和 Gd3 修饰可改善 CO2 光催化还原为碳氢燃料的性能
DOI：
10.1016/j.cej.2020.125944
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发表时间：
2020-11-15
影响因子：
15.1
通讯作者：
Hou, Yang
中科院分区：
文献类型：
--
作者：
Wu, Jun;Xie, Yu;Hou, Yang
大气环境中二氧化碳（CO2）水平的上升是全球变暖的一个关键原因。为了降低大气中的CO2浓度，将CO2转化为碳氢化合物燃料是一个引人注目的策略。在这里，我们实现了原位掺杂Gd 3+的BiOBr微球组成的纳米片，通过一个简单的水热方法。所得到的Gd掺杂的BiOBr结构（BiOBr/Gd）表现出相当大的改善光催化活性的CO2还原。与裸BiOBr（24.097 μ mol g（-1），3 h）相比，BiOBr/Gd-0.05显示出优异的CO2光还原性能，甲醇排放速率增加近5倍（123.711 μ mol g（-1），3 h）。BiOBr/Gd-0.05催化剂的CO2还原活性的提高是由于Gd ~（3+）离子被引入BiOBr晶格中，拓宽了其可见光响应的机制。在此基础上，我们讨论了光催化还原CO2的机理，其中空穴是CO2还原过程中的主要活性物种。
Rising carbon dioxide (CO2) levels in the atmospheric environment is a key cause of global warming. To reduce the concentration of CO2 in the atmosphere, converting CO2 into hydrocarbon fuels is an eye-catching strategy. Herein, we achieve in-situ doping of Gd3+ for BiOBr microspheres consisting of nanosheets via a simple hydrothermal method. The resulting Gd doped BiOBr structure (BiOBr/Gd) exhibits considerable improvement on photocatalytic activities for CO2 reduction. Compared to bare BiOBr (24.097 mu mol g(-1) for 3 h), the BiOBr/Gd-0.05 displays excellent performance of CO2 photoreduction with nearly five-fold increase in the rate of methanol emission (123.711 mu mol g(-1) for 3 h). The enhanced CO2 reduction activities of BiOBr/Gd-0.05 are attributed to the mechanism that Gd3+ ions are introduced into the lattice of BiOBr to broaden the visible light response. Furthermore, we discuss the mechanism of photocatalytic CO2 reduction, where holes are the main active species in the process of CO2 reduction.