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Construction of Few-Layer Ti3C2 MXene and Boron-Doped g-C3N4 for Enhanced Photocatalytic CO2 Reduction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-17 , DOI: 10.1021/acssuschemeng.1c01155
Haiqiang Wang 1, 2 , Qijun Tang 1, 2 , Zhongbiao Wu 1, 2
Affiliation  

The conversion of carbon dioxide (CO2) into high-value-added chemicals by photocatalysis is recognized as a potential method to ease the greenhouse effect and the global energy crisis simultaneously. Herein, boron-doped graphitic carbon nitride (g-C3N4) was combined with few-layer Ti3C2 MXene (FLTC) by electrostatic self-assembly. The composite exhibited superior performance to bare g-C3N4 and B-doped g-C3N4 (BCN). The optimized 12FLTC/BCN produced 3.2- and 8.9-times higher CO and CH4 yields, respectively, than bare g-C3N4 under visible light. Moreover, 12FLTC/BCN showed excellent stability during the cycling experiment. Several characterizations (photoluminescence, time-resolved photoluminescence, and it curves) were carried out to demonstrate the synergy of boron dopants and the addition of FLTC. Besides, 12FLTC/BCN showed enhanced separation of photoinduced carriers and accelerated charge transport, leading to better photocatalytic activity. We believe that this work will encourage more research on MXene-based photocatalysts for different photocatalysis processes including photocatalytic CO2 reduction.

中文翻译:

用于增强光催化 CO 2还原的少层 Ti 3 C 2 MXene 和掺硼 gC 3 N 4 的构建

通过光催化将二氧化碳 (CO 2 ) 转化为高附加值化学品被认为是同时缓解温室效应和全球能源危机的潜在方法。在此,硼掺杂的石墨碳氮化物 (gC 3 N 4 ) 通过静电自组装与少层 Ti 3 C 2 MXene (FLTC) 结合。该复合材料表现出优于裸 gC 3 N 4和 B 掺杂 gC 3 N 4 (BCN) 的性能。优化的 12FLTC/BCN 产生的 CO 和 CH 4产量分别比裸 gC 3 N 4高 3.2 倍和 8.9 倍在可见光下。此外,12FLTC/BCN 在循环实验中表现出优异的稳定性。进行了几种表征(光致发光、时间分辨光致发光和i - t曲线)以证明硼掺杂剂和 FLTC 添加的协同作用。此外,12FLTC/BCN 表现出增强的光生载流子分离和加速电荷传输,导致更好的光催化活性。我们相信这项工作将鼓励对基于 MXene 的光催化剂进行更多研究,用于不同的光催化过程,包括光催化 CO 2还原。
更新日期:2021-06-28
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