Zou ruqiang group of Peking University has made new progress in the preparation of boron nitrogen Co doped carbon nanotubes

Recently, Zou ruqiang's research group of Beijing University of technology has made new progress in the preparation of boron nitrogen Co doped carbon nanotubes, and successfully prepared a new kind of nano bud like selenium cobalt type cose 2 nano material coated with boron nitrogen Co doped carbon nanotubes And the mechanism of sodium storage was studied in detail As a negative electrode material of sodium ion battery, the material showed high capacity and high rate performance The corresponding results were published online in advanced energy materials (DOI: 10.1002/aenm.201901778) In recent years, Zou ruqiang research group of Peking University has carried out research work in the field of preparing boron nitrogen Co doped carbon nanotubes coated metal composite materials, and made a series of progress A simple solution pyrolysis method was developed to prepare boron nitrogen Co doped carbon nanotubes (BCN), and the morphology control mechanism was studied The BCN exhibited excellent electrocatalytic oxygen reduction performance (j.mater.chem A, 2016, 4, 16469) The melamine sponge substrate was introduced to realize the large-scale preparation of the BCN, and it was successfully used in super capacitors (j.mater.chem A, 2018, 6, 21225) In the synthesis process, metal elements were introduced into the MOF precursor, and the boron nitrogen Co doped carbon nanotube coated cobalt phosphide nanomaterials were successfully prepared by pyrolysis and phosphating, showing good hydrogen precipitation performance (adv energy Mater., 2017, Through precise morphology control, a series of boron nitrogen Co doped carbon nanotubes coated hollow Ni, Co, Mn and other metal oxide materials were successfully prepared and used in high-performance lithium-ion batteries (adv mater 2018, 30, 1705441) and was invited to publish a review article in the international top journal Energy & Environmental Science, summarizing the progress of carbon nanotube coated metal nanocomposites in the field of electrochemical energy storage and conversion (DOI: 10.1039/c9ee00315k) Due to the high abundance and low cost of sodium in the earth's crust, rechargeable sodium ion batteries (NIBS) have attracted extensive attention in the field of energy storage, showing great potential to replace lithium ion batteries However, due to its larger ion radius, the electrochemical kinetic process of sodium ion is more slow, and the cycle stability of electrode materials is often worse Therefore, it is necessary to develop electrode materials with good performance and study the sodium storage mechanism of sodium ion batteries Transition metal disulfide compounds (TMD) are considered to be ideal electrode materials due to their low cost and superior physical and chemical properties Among them, galena cobaltite type cose 2 is composed of two se atoms embedded in the crystal structure of CO, which plays a key role in the rapid storage of sodium ions Based on this, Zou ruqiang's group successfully prepared the nano bud like cobaltite type cose 2 nano material coated with boron nitrogen Co doped carbon nanotubes by simple pyrolysis and selenidation method (Figure 1), which shows ultra-high capacity After 100 cycles, it still has a high capacity of 580 Ma h g − 1 at the current density of 100 Ma g − 1, and at the same time, it has ultra-high rate performance and stability, and can maintain 98% capacity after 4000 cycles at the current density of 8 A G − 1 (Figure 2) The electrochemical process of sodium storage and the change of material morphology after cell cycle were characterized The results showed that the synergistic effect between boron nitrogen Co doped carbon nanotubes and cose 2 greatly enhanced the capacity and stability of sodium ion battery Figure 1 Schematic diagram of synthesis of nano bud like selenocobalite type cose 2 material coated by boron and nitrogen Co doped carbon nanotubes (source: advanced energy materials) Figure 2 Relevant papers on material structure analysis after battery cycle (source: advanced energy materials) are published online in advanced energy materials The first author of this work is Peking University Hassina tabassum, postdoctoral student of Institute of technology, corresponding author is Professor Zou ruqiang The research was supported by NSFC science foundation for Distinguished Young Scholars, national key basic research and development plan, National Youth top talent support plan and other projects.