光催化
纳米复合材料
材料科学
异质结
锐钛矿
化学工程
金属有机骨架
载流子
碳纤维
可见光谱
复合材料
纳米技术
复合数
化学
吸附
催化作用
有机化学
光电子学
工程类
作者
Mian Zahid Hussain,Zhuxian Yang,Bart van der Linden,Werner R. Heinz,Mounib Bahri,Ovidiu Ersen,Quanli Jia,Roland A. Fischer,Yan Zhu,Yongde Xia
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2022-09-01
卷期号:36 (19): 12212-12225
被引量:9
标识
DOI:10.1021/acs.energyfuels.2c02319
摘要
Bimetal-organic-framework (Bi-MOF) NH2-MIL-125(Ti/Cu)-derived nanocomposites are systematically investigated to elucidate the role of individual species TiO2, CuxO and the porous carbon matrix in photocatalytic activity. Among the studied samples, the TiO2/CuxO/C nanocomposite derived from heat processing NH2-MIL-125(Ti/Cu) under Ar/H2O vapor demonstrates the highest photocatalytic H2 evolution performance due to the formation of a phasejunction between the well-crystallized anatase/rutile TiO2 polymorph, the optimized and codoped nitrogen/carbon in the composites, the formation of p–n heterojunctions between the TiO2 and CuxO nanoparticles, as well as their uniform distribution in a hydrophilic porous carbon matrix decorated with N and carboxylic functional groups. These parameters enable the in situ-formed multi-heterostructures in these nanocomposites to not only possess relatively narrower energy band gaps and improved spatial charge separation due to the formed type-II staggered p–n heterojunctions but also offer multiple pathways for charge diffusion, resulting in lower charge-transfer resistance, suppressed bulk charge recombination, and consequently, much improved visible-light absorption. Therefore, the Bi-MOF NH2-MIL-125(Ti/Cu)-derived TiO2/CuxO/C nanocomposite provides easily accessible active sites with an excellent photocatalytic H2 evolution activity of 3147 μmol gcat–1 h–1, 99 times higher than that of bare TiO2. This work provides a simple one-step approach to producing tunable novel nanocomposites for efficient photocatalytic H2 evolution without using expensive noble metals as cocatalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI