Porous hypercrosslinked polymer-TiO2-graphene composite photocatalysts for visible-light-driven CO2 conversion
Porous hypercrosslinked polymer-TiO2-graphene composite photocatalysts for visible-light-driven CO2 conversion
复制标题
用于可见光驱动二氧化碳转化的多孔超交联聚合物-TiO2-石墨烯复合光催化剂
DOI：
10.1038/s41467-019-08651-x
复制
发表时间：
2019-02-08
影响因子：
16.6
通讯作者：
Tan, Bien
中科院分区：
文献类型：
--
作者：
Wang, Shaolei;Xu, Min;Tan, Bien
人们一直致力于开发高效的可见光驱动的光催化剂，用于将CO2转化为化学燃料。这种转化的光催化效率在很大程度上取决于CO2的吸附和扩散。然而，由于光催化剂的比表面积小，且缺乏匹配的孔道，CO2在光催化剂表面的吸附量一般较低。在这里，我们报告了一种具有相对高表面积的明确定义的多孔超交联聚合物-TiO 2-石墨烯复合结构，即，988 m2 g− 1和CO2吸收能力，即，12.87重量%。该复合材料显示出高的光催化性能，特别是对于CH 4的产生，即，27.62 μmol g−1 h−1，在温和的反应条件下，不使用牺牲试剂或贵金属助催化剂。CO2反应活性的提高主要归因于其对CO2的吸附和扩散、可见光吸收以及光生电荷分离效率的提高。这一策略为微孔有机聚合物与光催化剂的结合提供了新的见解，用于太阳能到燃料的转化。
Significant efforts have been devoted to develop efficient visible-light-driven photocatalysts for the conversion of CO2to chemical fuels. The photocatalytic efficiency for this transformation largely depends on CO2adsorption and diffusion. However, the CO2adsorption on the surface of photocatalysts is generally low due to their low specific surface area and the lack of matched pores. Here we report a well-defined porous hypercrosslinked polymer-TiO2-graphene composite structure with relatively high surface area i.e., 988 m2 g−1and CO2uptake capacity i.e., 12.87 wt%. This composite shows high photocatalytic performance especially for CH4production, i.e., 27.62 μmol g−1 h−1, under mild reaction conditions without the use of sacrificial reagents or precious metal co-catalysts. The enhanced CO2reactivity can be ascribed to their improved CO2adsorption and diffusion, visible-light absorption, and photo-generated charge separation efficiency. This strategy provides new insights into the combination of microporous organic polymers with photocatalysts for solar-to-fuel conversion.