Unraveling the mystery of sandwich structure: Emerging photocatalytic hydrogen production by g-C3N5 3 N 5 coupled Nb2C 2 C MXene forming Schottky heterojunction

doi:10.1016/j.seppur.2024.128883

	Unraveling the mystery of sandwich structure: Emerging photocatalytic hydrogen production by g-C3N5 3 N 5 coupled Nb2C 2 C MXene forming Schottky heterojunction
	Zhang, Mingzhi 1; Zhang, Yan 1; Chang, Hui 2; Wang, Wenqi 1; Wu, Lijiang 1; Li, Caixiao 1; Li, Yi 1; Jing, Xiaoqing 1; Yang, Weiting 1; Xie, Hongbo 1; Qiu, Ri 1; Crittenden, John 3; Wang, Xiutong 4; Liu, Qing3,5
	2025-02-19
发表期刊	SEPARATION AND PURIFICATION TECHNOLOGY
ISSN	1383-5866
卷号	354 页码:13
通讯作者	Zhang, Yan(tougaoktz@163.com) ; Chang, Hui(changhui2000_mic@sdust.edu.cn)
摘要	The development of new photocatalysts and photocatalytic systems is the essence of the development of photocatalytic hydrogen production engineering. Nitrogen-rich graphite carbon nitride (g-C3N5) 3 N 5 ) has gradually replaced conventional graphite phase carbon nitride (g-C3N4) 3 N 4 ) with a smaller bandgap and high-efficiency visible light utilization. In this study, g-C3N5 3 N 5 and Nb2C 2 C MXene coupled composition with sandwich structure were manufactured by a simple ultrasonic magnetic stirring method and used for photocatalytic hydrogen production. By adjusting the ratios of single components in the system, the hydrogen production rate of the optimal sample 4:1g-C3N5/Nb2C 3 N 5 /Nb 2 C under visible light irradiation is 2529.5 mu mol center dot g-- 1 center dot h- 1 , which is 21 times higher than that of gC3N5. 3 N 5 . The high apparent quantum yield (AQY) value of 17.3 % also proves a high light utilization rate. The atomic force microscopy (AFM) technique reveals variations in the thickness of the samples, while strongly demonstrating the formation of sandwich structure. In addition, X-ray photoelectron spectroscopy (XPS) analysis further reveals the electron transfer paths within the system, preliminarily verifying the formation of Schottky heterojunctions. Kelvin probe force microscopy (KPFM) tests not only re-validate the correctness of the electron transfer path but also demonstrate the accuracy of the energy bands. The density-functional theory (DFT) calculations corroborate that Nb2C 2 C MXene plays the role of a photoco-catalyst to form Schottky heterojunctions with g-C3N5 3 N 5 for efficient carrier separation and migration. This work highlights the key role of sandwich structure photocatalytic systems on photocatalytic performance.
关键词	Niobium carbide Mxene Nitrogen-rich graphitic carbon nitride Sandwich-structure Photocatalytic hydrogen evolution Schottky junction
DOI	10.1016/j.seppur.2024.128883
收录类别	SCI
语种	英语
资助项目	Brook Byers Institute for Sustainable Systems ; Georgia Research Alliance at the Georgia Institute of Technology ; Hightower Chair ; Shandong Provincial Natural Science Foundation[ZR202103010716] ; Qingdao Natural Science Foundation[23-2-1-233-zyyd-jch]
WOS研究方向	Engineering
WOS类目	Engineering, Chemical
WOS记录号	WOS:001278619500001
出版者	ELSEVIER
WOS关键词	CARBON NITRIDE ; C3N5
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186148
专题	海洋环境腐蚀与生物污损重点实验室
通讯作者	Zhang, Yan; Chang, Hui
作者单位	1.Shandong Univ Sci & Technol, Coll Safety & Environm Engn, Qingdao 266590, Peoples R China 2.Shandong Univ Sci & Technol, Coll Elect & Automat Engn, Qingdao 266590, Peoples R China 3.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA 4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China 5.Shandong Univ Sci & Technol, Coll Chem & Biol Engn, Qingdao 266590, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingzhi,Zhang, Yan,Chang, Hui,et al. Unraveling the mystery of sandwich structure: Emerging photocatalytic hydrogen production by g-C3N5 3 N 5 coupled Nb2C 2 C MXene forming Schottky heterojunction[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2025,354:13.
APA	Zhang, Mingzhi.,Zhang, Yan.,Chang, Hui.,Wang, Wenqi.,Wu, Lijiang.,...&Liu, Qing.(2025).Unraveling the mystery of sandwich structure: Emerging photocatalytic hydrogen production by g-C3N5 3 N 5 coupled Nb2C 2 C MXene forming Schottky heterojunction.SEPARATION AND PURIFICATION TECHNOLOGY,354,13.
MLA	Zhang, Mingzhi,et al."Unraveling the mystery of sandwich structure: Emerging photocatalytic hydrogen production by g-C3N5 3 N 5 coupled Nb2C 2 C MXene forming Schottky heterojunction".SEPARATION AND PURIFICATION TECHNOLOGY 354(2025):13.