Decorating g-C3N4 with alkalinized Ti3C2 MXene for promoted photocatalytic CO2 reduction performance.
Decorating g-C3N4 with alkalinized Ti3C2 MXene for promoted photocatalytic CO2 reduction performance.
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DOI：
10.1016/j.jcis.2019.12.091
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发表时间：
2019-12
影响因子：
9.9
通讯作者：
Qijun Tang;Zhuxing Sun;S. Deng;Haiqiang Wang;Zhongbiao Wu
中科院分区：
文献类型：
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作者：
Qijun Tang;Zhuxing Sun;S. Deng;Haiqiang Wang;Zhongbiao Wu
近年来，在可见光照射下光催化还原二氧化碳（CO2）生产高价值燃料引起了极大的关注。在这项研究中，通过简单地将石墨氮化碳（g-C3N4）和碱化Ti3C2混合，将碳化钛MXene（Ti3C2）用作不含贵金属的助催化剂。优化后的复合材料（5%TCOH-CN）光催化还原CO2的一氧化碳释放速率比纯g-C3N4高5.9倍。碱化Ti3C2由于其优异的导电性和大的CO2吸附能力而具有优异的光催化活性。此外，由于碱化Ti3C2和纯g-C3N4之间费米能级差异较大，光生电子空穴对的分离大大增强。这项工作展示了 MXene 作为无贵金属助催化剂用于二氧化碳还原反应和氮气还原反应等光催化过程的潜力。
Photocatalytic reduction of carbon dioxide (CO2) under visible light irradiation for producing high-value fuel has attracted tremendous attention in recent years. In this study, titanium carbide MXene (Ti3C2) was used as a noble metal-free co-catalyst by simply mixing graphitic carbon nitride (g-C3N4) and alkalized Ti3C2. The carbon monoxide evolution rate of the optimized composite (5%TCOH-CN) from photocatalytic reduction of CO2was 5.9 times higher than that of pure g-C3N4. Alkalized Ti3C2was responsible for the superior photocatalytic activity due to its excellent electrical conductivity and large CO2adsorption capacity. Furthermore, the separation of the photo-induced electron–hole pairs was greatly enhanced because of the large Fermi level difference between alkalized Ti3C2and pure g-C3N4. This work demonstrates the potential of MXenes as noble metal-free co-catalyst for photocatalysis processes such as carbon dioxide reduction reaction and nitrogen reduction reaction.