Evolution of Zn(II) single atom catalyst sites during the pyrolysis-induced transformation of ZIF-8 to N-doped carbons
文献类型：期刊论文
| 作者 | Wang, Q; Ina, T; Chen, WT; Shang, L; Sun, FF; Wei, SH; Sun-Waterhouse, D; Telfer, SG; Zhang, TR; Waterhouse, GIN |
| 刊名 | SCIENCE BULLETIN
 |
| 出版日期 | 2020 |
| 卷号 | 65期号:20页码:1743-1751 |
| 关键词 | OXYGEN REDUCTION EFFICIENT ELECTROREDUCTION COORDINATION ELECTROCATALYSTS GRAPHENE |
| ISSN号 | 2095-9273 |
| DOI | 10.1016/j.scib.2020.06.020 |
| 文献子类 | 期刊论文 |
| 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 degrees 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 degrees C. As the pyrolysis temperature increased in the range 600-900 degrees C, the Zn atoms moved closer to the N-4 coordination plane. This subtle geometry change in the ZnN4 sites alters the electron density on the Zn atoms (formally Zn-2(+)), strongly impacting the catalytic performance for the peroxidase-like decomposition of H2O2. The catalyst obtained at 800 degrees 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. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/32865]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Massey Univ, MacDiarmid Inst Adv Mat & Nanotechnol, Palmerston North 4442, New Zealand 2.Univ Auckland, Sch Chem Sci, Auckland 1142, New Zealand 3.Japan Synchrotron Radiat Res Inst, Res & Utilizat Div, Kouto 6795148, Japan 4.Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China 5.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China 6.Univ Auckland, Fac Engn, Dept Chem & Mat Engn, Auckland 1142, New Zealand |
| 推荐引用方式 GB/T 7714 | Wang, Q,Ina, T,Chen, WT,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,2020,65(20):1743-1751. |
| APA | Wang, Q.,Ina, T.,Chen, WT.,Shang, L.,Sun, FF.,...&Waterhouse, GIN.(2020).Evolution of Zn(II) single atom catalyst sites during the pyrolysis-induced transformation of ZIF-8 to N-doped carbons.SCIENCE BULLETIN,65(20),1743-1751. |
| MLA | Wang, Q,et al."Evolution of Zn(II) single atom catalyst sites during the pyrolysis-induced transformation of ZIF-8 to N-doped carbons".SCIENCE BULLETIN 65.20(2020):1743-1751. |
入库方式： OAI收割
来源：上海应用物理研究所
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