globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2020.06.020
论文题名:
Evolution of Zn(II) single atom catalyst sites during the pyrolysis-induced transformation of ZIF-8 to N-doped carbons
作者: Wang Q.; Ina T.; Chen W.-T.; Shang L.; Sun F.; Wei S.; Sun-Waterhouse D.; Telfer S.G.; Zhang T.; Waterhouse G.I.N.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期:20
起始页码: 1743
结束页码: 1751
语种: 英语
中文关键词: Metal organic frameworks ; Metal single atom catalysts ; N-doped carbon ; Porphyrin-like sites ; X-ray absorption spectroscopy
英文关键词: Atoms ; Catalysts ; Doping (additives) ; Porphyrins ; Pyrolysis ; X ray absorption spectroscopy ; Catalyst site ; Catalytic performance ; Coordination plane ; Geometry change ; Pyrolysis temperature ; Single atoms ; Structural evolution ; Zeolitic imidazolate frameworks ; Zinc compounds
英文摘要: The pyrolysis of zeolitic imidazolate frameworks (ZIFs) is becoming a popular approach for the synthesis of catalysts comprising porphyrin-like metal single atom catalysts (SACs) on N-doped carbons (M-N-C). Understanding the structural evolution of M-N-C as a function of ZIF pyrolysis temperature is important for realizing high performance catalysts. Herein, we report a detailed investigation of the evolution of Zn single atom catalyst sites during the pyrolysis of ZIF-8 at temperatures ranging from 500 to 900 °C. Results from Zn L-edge and Zn K-edge X-ray absorption spectroscopy studies reveal that tetrahedral ZnN4 centers in ZIF-8 transform to porphyrin-like ZnN4 centers supported on N-doped carbon at temperatures as low as 600 °C. As the pyrolysis temperature increased in the range 600–900 °C, the Zn atoms moved closer to the N4 coordination plane. This subtle geometry change in the ZnN4 sites alters the electron density on the Zn atoms (formally Zn2+), strongly impacting the catalytic performance for the peroxidase-like decomposition of H2O2. The catalyst obtained at 800 °C (Zn-N-C-800) offered the best performance for H2O2 decomposition. This work provides valuable new insights about the evolution of porphyrin-like single metal sites on N-doped carbons from ZIF precursors and the factors influencing SAC activity. © 2020 Science China Press
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170067
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: School of Chemical Sciences, The University of Auckland, Auckland, 1142, New Zealand; Research & Utilization Division, Japan Synchrotron Radiation Research Institute, Kouto, 679-5148, Japan; Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China; Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China; Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland, 1142, New Zealand; MacDiarmid Institute for Advanced Materials and Nanotechnology, Massey University, Palmerston North, 4442, New Zealand

Recommended Citation:
Wang Q.,Ina T.,Chen W.-T.,et al. Evolution of Zn(II) single atom catalyst sites during the pyrolysis-induced transformation of ZIF-8 to N-doped carbons[J]. Science Bulletin,2020-01-01,65(20)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Wang Q.]'s Articles
[Ina T.]'s Articles
[Chen W.-T.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Wang Q.]'s Articles
[Ina T.]'s Articles
[Chen W.-T.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Wang Q.]‘s Articles
[Ina T.]‘s Articles
[Chen W.-T.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.