"ACS AMI" from the research group of Professor Deng Zhao of Soochow University: MOF-derived ultra-high specific surface porous carbon nanocube...

Aprotic lithium oxygen (Li-O ₂ ) batteries have attracted great interest because of their highest theoretical energy density among various rechargeable batteries

Figure 1.

Preparation and characterization of Ru@MCN

Using SEM, XRD, BET and TEM, various characterization techniques, nano-materials proved that the ultra-high specific surface area and a uniform load Ru nanoparticles
.

Figure 2.

Electrochemical performance of Ru@MCN, MCN and Super P in lithium oxygen battery

By comparing the electrochemical performance of Ru@MCN , MCN and commercial conductive carbon Super P , it is proved that the highly catalytically active Ru nanoparticles and the porous structure with high specific surface are significant for increasing the discharge capacity of the lithium oxygen battery and reducing its overpotential.

The effect

Figure 3.

Cycle and rate performance of Ru@MCN

Ru @ MCN phase has a more prominent cycle stability and rate properties to the other two samples, even in .

1 000 m A G ^-1 at a high current density can be stably cycle .
1 00 or more rings, by a longitudinal study cycle EIS It is found that the reason why Ru@MCN has better stability is that the insulation product Li ₂ O ₂ produced by discharge has better reversibility

Figure 4.

(Non) in situ characterization of the cathode demonstrating the reversible formation /decomposition of Li ₂ O ₂ .

  Through SEM, XRD and XPS, it is found that the discharge product of this system is flaky Li ₂ O ₂ , which can be fully consumed after charging, so as to realize a stable and reversible cycle
.

Situ DEMS ratio detected during the charging process and the discharging electrons and oxygen were 2 .
07 and 2 .
05 , demonstrated very weak side reaction in the system

Introduction of Professor Deng Zhao and his research group

  Deng Zhao is a professor of the School of Energy, Soochow University, a doctoral supervisor, a candidate for the National Four Youth Talents, and a distinguished professor of Jiangsu Province
.

In 1999 and 2002, he obtained a bachelor's degree in fine chemical engineering and a master's degree in applied chemistry from the School of Chemistry and Chemical Engineering, Shanghai Jiaotong University

Related link
  https://pubs.
acs.
org/doi/abs/10.
1021/acsami.
1c06572