Wang Xiaohan, Liang Feng, Gu Haohui, Wu Shuaibing, Cao Yunbo, Lv Gongye, Zhang Haijun, Jia Quanli, Zhang Shaowei
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
J Colloid Interface Sci. 2022 Sep;621:311-320. doi: 10.1016/j.jcis.2022.04.003. Epub 2022 Apr 5.
The conversion of CO into clean fuels by utilizing solar energy is still limited by a low photoconversion efficiency, and heterojunction photocatalysts are considered a very effective way to solve this problem. Herein, a heterojunction system consisting of hematite (α-FeO) and boron carbonitride (BCN) was fabricated through a one-pot ionothermal method. α-FeO nanoparticles were grown in situ on the surface of BCN nanosheets, forming an α-FeO/BCN heterojunction (FBCN) with tiny amounts of α-FeO (less than 2 wt%). The as-synthesized FBCN catalyst with 1.46 wt% α-FeO provides the highest CO photoreduction activity (55.1 µmol g for CO) without any cocatalyst or sacrificial reagents, which is 3.9 times higher than that obtained for pure BCN. The enhanced CO reduction activity can be attributed to the high surface area and effective interface-contacted heterostructure, which endows the catalyst with broadband visible light absorption, suppressed separation of photogenerated electron holes, and promoted charge transfer. Meanwhile, cycling experiments demonstrate that the FBCN photocatalyst shows good reusability and stability. This work can assist in the design and preparation of BCN-based heterojunctions with effective CO reduction performance.
利用太阳能将一氧化碳转化为清洁燃料仍受限于低光转换效率，而异质结光催化剂被认为是解决这一问题的非常有效的方法。在此，通过一锅离子热法制备了一种由赤铁矿（α-Fe₂O₃）和硼碳氮化物（BCN）组成的异质结体系。α-Fe₂O₃纳米颗粒原位生长在BCN纳米片表面，形成了含有少量α-Fe₂O₃（小于2 wt%）的α-Fe₂O₃/BCN异质结（FBCN）。所合成的含有1.46 wt% α-Fe₂O₃的FBCN催化剂在没有任何助催化剂或牺牲试剂的情况下具有最高的CO光还原活性（CO为55.1 μmol g），这比纯BCN的活性高3.9倍。增强的CO还原活性可归因于高表面积和有效的界面接触异质结构，这赋予了催化剂宽带可见光吸收、抑制光生电子空穴的分离以及促进电荷转移的能力。同时，循环实验表明FBCN光催化剂具有良好的可重复使用性和稳定性。这项工作有助于设计和制备具有有效CO还原性能的基于BCN的异质结。
