A major breakthrough in new 3.7v 2200mah 18650 lithium battery catalysts!

The commercial application of proton exchange membrane 3.7v 2200mah 18650 lithium batterys is limited by the slow oxygen reduction kinetics of the cathode. At present, the most effective strategy to improve the oxygen reduction catalytic activity is to optimize the bonding energy between the catalyst and the oxygen-containing species by alloying transition metals M (M = Fe, Co, Ni, Cu, etc.) with precious metals Pt, thereby enhancing the oxygen reduction catalytic activity.

Recent studies have shown that interfacial catalysts can provide another effective way to enhance the oxygen reduction catalytic activity compared to surface catalysts. However, how to design efficient interfacial catalysts with new interfacial enhancement mechanisms remains a huge challenge.

Due to their high electrical and thermal conductivity, excellent mechanical strength, hardness, chemical stability and corrosion resistance, transition metal carbides have received considerable attention in recent years. Creating a new interfacial catalyst by combining PtM and transition metal carbides remains a huge challenge.

To solve these problems, the team of Guo Shaojun from the School of Engineering at Peking University designed and developed a new dumbbell-shaped PtFe-Fe2C nanoparticle. This dumbbell-shaped PtFe-Fe2C nanoparticle is obtained by carbonizing dumbbell-shaped PtFe-Fe3O4 nanoparticles.

Electrochemical tests show that the specific activity and mass activity of the catalyst for oxygen reduction in acidic media reached 3.53mAcm2 and 1.50Amg1, respectively, which are 11.8 and 7.1 times higher than commercial Pt/C, respectively. It also has extremely excellent electrochemical stability, and the activity of the catalyst has hardly decayed after 5000 cycles.

The research team further calculated and found that this unique structure has a novel barrier-free interface electron transport mechanism, which is more conducive to the electrocatalytic reaction and thus improves the electrocatalytic activity.

This barrier-free interface electron transport mechanism can also be extended to other electrocatalytic systems, such as electrocatalytic hydrogen evolution reaction and hydrogen peroxide electrocatalytic reduction. The specific activity of the catalyst for hydrogen evolution in acidic media reached 28.2mAcm2, which is 2.9 times higher than commercial Pt/C.

The detection limit of the hydrogen peroxide electrochemical sensor based on this catalyst reached 2nM. This work has guiding significance for the theoretical research of electrocatalysis and the development of new high-efficiency 3.7v 2200mah 18650 lithium battery electrocatalysts, and also provides new ideas for the structural design of the next generation of high-performance and low-cost electrocatalysts.

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