{"id":143766,"date":"2020-12-29T19:31:56","date_gmt":"2020-12-29T16:31:56","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/scientists-identify-electronic-and-structural-dynamics-of-catalytic-centers-in-single-fe-atom-materials\/"},"modified":"2020-12-29T19:31:56","modified_gmt":"2020-12-29T16:31:56","slug":"scientists-identify-electronic-and-structural-dynamics-of-catalytic-centers-in-single-fe-atom-materials","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/scientists-identify-electronic-and-structural-dynamics-of-catalytic-centers-in-single-fe-atom-materials\/","title":{"rendered":"#Scientists identify electronic and structural dynamics of catalytic centers in single-Fe-atom materials"},"content":{"rendered":"

“#Scientists identify electronic and structural dynamics of catalytic centers in single-Fe-atom materials<\/strong>”<\/p>\n

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\"Scientists
\n The identification of the electronic and structural dynamics of catalytic centers in single-Fe-atom material by Operando Mossbauer spectroscopy. Credit: LI Xuning
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Single-atom catalyst (SAC) is a conceptual bridge between homo- and heterogeneous catalysis. It offers new opportunities for capturing the reaction intermedia<\/a>tes by identifying the active sites, and even monitoring the dynamic behaviors of both the geometric structure and electronic environment of the catalytic sites at atomic scale.<\/p>\n


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Both the exploration of model SACs with a definite microenvironment and the development of novel operando techniques with high atomic resolution are significant, yet still challenging.<\/p>\n

Recently, a research team led by Prof. Huang Yanqiang and Prof. Zhang Tao from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Science<\/a>s and their collaborators reported their findings on electronic and structural dynamics of catalytic centers in single-Fe-atom materials under in situ oxygen reduction reaction (ORR) conditions.<\/p>\n

The study was published in Chem<\/i> on Nov. 20.<\/p>\n

The researchers synthesized single-Fe-atom catalysts with well-controlled site density and definite N-coordination environment via a solvent-assisted linker exchange (SALE) method. They used it as the model system for electronic-level understanding of the ORR mechanism.<\/p>\n

“We developed Operando Mossbauer spectroscopy for the first time to identify the exact structures and spin state of active atomically dispersed Fe moieties during ORR,” said Prof. Huang.<\/p>\n

By combining with operando Raman and X-ray absorption spectroscopy (XAS) measurements, as well as density functional theory (DFT) studies, the researchers proved that the potential-relevant structural and electronic evolutions of the active single-Fe-atom moieties were via directly capturing the *O2<\/sub>– and *OH-intermediates under ORR conditions.<\/p>\n

These results provided a proof of concept for the integration of operando techniques and SACs, which might direct the way toward the electronic-level insight into the catalytic centers and reaction mechanism.<\/p>\n\n

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Scientists propose redox mechanism for water-gas shift reaction\n <\/p><\/div>\n

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\n More information:<\/strong>
\n Xuning Li et al. Identification of the Electronic and Structural Dynamics of Catalytic Centers in Single-Fe-Atom Material, Chem<\/i> (2020). DOI: 10.1016\/j.chempr.2020.10.027<\/a><\/p>\n
\n Journal information:<\/strong>
\n Chem<\/cite>
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\n Provided by
\n Chinese Academy of Sciences
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Citation<\/strong>:
\n Scientists identify electronic and structural dynamics of catalytic centers in single-Fe-atom materials (2020, December 29)
\n retrieved 29 December 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-12-scientists-electronic-dynamics-catalytic-centers.html<\/p>\n

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\n part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n