Improving methane selectivity of photo-induced CO2 reduction on carbon dots through modification of nitrogen-containing groups and graphitization
Improving methane selectivity of photo-induced CO2 reduction on carbon dots through modification of nitrogen-containing groups and graphitization
复制标题
通过含氮基团修饰和石墨化提高碳点光诱导CO2还原的甲烷选择性
DOI：
10.1016/j.apcatb.2018.03.045
复制
发表时间：
2018-09-15
影响因子：
22.1
通讯作者：
Chen, Jiazang
中科院分区：
文献类型：
--
作者：
Liu, Zhi;Wang, Zhijian;Chen, Jiazang
碳点的光催化性能与表面修饰和石墨化密切相关。在这里，我们表明，没有金属负载的碳点可以作为一种有效的光催化剂来还原二氧化碳。共轭碳原子能够稳定光生电子，从而改善光生电子-空穴对的分离，并能动力学地促进界面反应。此外，碳点上的含氮基团对CO的强烈化学吸附将有助于在所展示的CO2光还原体系中进一步转化中间体。由于这些优点，由富含氮基团的氧化石墨烯制备的高度石墨化的碳点具有74.8%的甲烷电子选择性。这一策略对CO2光催化剂的设计提出了重要的要求。
The photocatalytic performance of carbon dots is strongly related to surface modifications and graphitization. Herein, we show that carbon dots without metal loaded can serve as an efficient photocatalyst for reducing CO2. The conjugate carbon great a could stabilize the photogenerated electrons, which turned out to improve the separation of the photogenerated electron-hole pairs and can kinetically promote interfacial reaction. Besides, the strong chemisorption of the nitrogen-containing groups on the carbon dots to the CO would help to further conversion of the intermediate in the demonstrated CO2 photo-reduction systems. As a result of these merits, the highly graphitized carbon dots prepared from graphene oxide with plenty of nitrogen-containing groups exhibit 74.8% electronic selectivity of methane. This strategy provides an important requirement for designing of CO2 photocatalysts.