Research group of Professor Song Yufei of Beijing University of Chemical Technology: precise positioning of single atom Ru on single layered hydrotalcite

In recent years, because of the uniform active sites, the maximization of atom utilization and the unique catalytic properties, monatomic catalysts have attracted extensive attention of researchers Similar to the active center of single metal in homogeneous catalyst, the active center with different anchor points constructed by strong metal support interaction plays an important role in the catalytic performance of the catalyst Therefore, it is still a challenging task to accurately locate the single atom loaded on the catalyst and further guide the design of new catalyst Recently, Professor Song Yufei, Professor Zhao Yufei and Dr Duan Haohong of Oxford University, who are the State Key Laboratory of chemical resources effective utilization of Beijing University of chemical technology, have successfully prepared single-layer NiFe hydrotalcite loaded with single atom Ru by one-step method Based on the detailed theoretical and experimental studies, it is confirmed that the single atom Ru is not randomly dispersed on the hydrotalcite laminate, but is anchored on the Fe atom of the hydrotalcite laminate through the coordination of three adjacent oxygen atoms on the laminate Relevant research results were published in the authoritative Chemical Science (DOI: 10.1039 / c8sc04480e) Wang Zelin, Ph.D student of Beijing University of chemical technology, and Xu Simin, Ph.D student, were the co authors of the paper Brief introduction of Professor Song Yufei's research group: the research object of Professor Song Yufei's research group is two kinds of important inorganic functional material systems, poly acid and hydrotalcite Based on strengthening the structural understanding of the two kinds of systems, expanding the functional application of the two kinds of systems as the export After more than 10 years of systematic research, a "multi acid intercalation supramolecular assembly and product engineering" has been formed The characteristic research direction has condensed the key scientific issues such as "performance oriented design of multi acid intercalation structure" and "product oriented control of intercalation assembly process", carried out basic and application basic research, proposed a new method of building multi acid intercalation assembly, developed a series of new materials for intercalation assembly, and realized the functional application of intercalation assembly Prof song Yufei, Professor, doctoral supervisor, winner of national fund for Distinguished Young Scholars From 1993 to 2002, he completed his master's degree and doctoral degree in Shanxi University As a postdoctoral researcher, he has successively engaged in scientific research in the Department of chemistry of Leiden University in the Netherlands (2002-2004), the Institute of bioinorganic chemistry of Max Planck in Germany (2004-2005), and the Department of chemistry of the University of Glasgow in the UK (2005-2008) In September 2008, he was hired to the State Key Laboratory of chemical resources effective utilization of Beijing University of chemical technology In 2012, he won the support of "National Excellent Youth Fund" of NSFC; in 2014, he won the first prize of science and technology progress of China Federation of petroleum and chemical industry; in 2015, he was selected into the "Yangtze River scholars Award Program" of Ministry of education; in 2016, he won the support of NSFC outstanding youth fund; 2017 In, he was selected as the young and middle-aged leading talents of science and technology innovation by the Ministry of science and technology Currently serves as editorial board member of Science Bulletin and J energy Chem magazine So far, he has published more than 140 SCI papers in NAT Protoc., chem SOC Rev., angel Chem Int ed., J am Chem SOC., adv func Mater And authorized 20 Chinese invention patents, and built a relatively complete independent intellectual property system Edited one English monograph and participated in three monographs He has successively presided over a number of national and provincial projects, such as the outstanding youth fund of NSFC, the key projects of NSFC, and the key research and development projects of the Ministry of science and technology Leading scientific research achievements: it is one of the core issues to understand the catalytic reaction to accurately locate the single atom Ru on the monolayer hydrotalcite and deeply understand the coordination structure of the catalytic active site In recent years, monoatomic catalysts have provided an important channel for the study of catalytic mechanism because of their simple structure and unique catalytic properties However, it is still a serious challenge to precisely locate the supported monoatomic catalysts Fig 1 Structural diagram of ru1 / NiFe LDH (source: Chemical Science) LDHs as a kind of two-dimensional layered bimetallic hydroxides with highly ordered arrangement and adjustable composition of metal elements in the main laminate, due to the strong Coulomb effect between the host and guest, The trivalent metal cations in the main laminate are uniformly and orderly dispersed by bivalent metal cations Inspired by the structure of hydrotalcite, the single-layer NiFe hydrotalcite (ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / NiFe LDH, ru1 / ru1, Fig 1) The coordination structure of the catalyst was characterized in detail by means of XAFS, stem and other spectroscopic means (Fig 2) It was proved that Ru atom was in monodisperse state Based on the XAFS characterization results, the system model is constructed, and the DFT calculation results are used to prove that the single atom Ru is not randomly dispersed on the hydrotalcite laminate, but is anchored on the Fe atom of the hydrotalcite laminate by coordinating with three adjacent oxygen atoms of the laminate Fig 2 The fine structure characterization of ru1 / NiFe LDH (source: Chemical Science) electrocatalytic oxidation of hydrazine hydrate shows that compared with NiFe hydrotalcite without Ru atom, NiFe hydrotalcite with Ru atom shows excellent catalytic activity in the electrocatalytic reduction of hydrazine hydrate It is confirmed by theoretical calculation that the loading of monatomic Ru can reduce the band gap to promote electron transport and stabilize the electrocatalytic oxidation of the intermediate products of hydrazine hydrate (* n2h3 and * N2H radicals), thus further reducing the activation energy barrier of the reaction and promoting the reaction (Fig 3) Fig 3 Electronic density of state, potential energy surface, model structure and Gibbs free energy of elementary reaction of hydrazine hydrate oxidation of ru1 / NiFe LDH (source: Chemical Science) This synthesis method is also applicable to other kinds of hydrotalcite (MgAl LDH, NiAl LDH), and can increase the loading of single atom Ru to 7.0 wt% This study deepens the understanding of the structure of single atom supported LDHs at the molecular level, and opens a new way for the design and synthesis of single atom catalysts with precise location and the understanding of structure-activity relationship The research work is supported by the State Key Laboratory for the effective utilization of chemical resources of Beijing University of chemical technology and the 1w1b-x-ray absorption spectrum experimental station of Beijing Synchrotron Radiation Facility Relevant research work has also been strongly supported by the national key basic research development plan (973 Plan), the national fund for Distinguished Young Scholars, and the Central University Basic Research Fund Nowadays, people and scientific research have been paid more and more attention in the economic life China has ushered in the "node of science and technology explosion" Behind the progress of science and technology is the work of countless scientists In the field of chemistry, in the context of the pursuit of innovation driven, international cooperation has been strengthened, the influence of Returned Scholars in the field of R & D has become increasingly prominent, and many excellent research groups have emerged in China For this reason, CBG information adopts the 1 + X reporting mechanism CBG information, chembeangoapp, chembeango official microblog, CBG wechat subscription number and other platforms jointly launch the column of "people and scientific research", approach the domestic representative research group, pay attention to their research, listen to their stories, record their demeanor, and explore their scientific research spirit.