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Dr. Jiazhao Wang

Institute for Superconducting and Electronic Materials, University of Wollongong, Australia

 

Talk Title
 New materials for Rechargeable Li-O2 batteries

Talk Abstract
 

A Li–air battery could reach an energy density 3–4 times higher than state-of-the-art Li-ion cells at the cell level. Research on the Li-air battery, however, is currently still in the early stages of understanding the basic scientific principles and mechanisms, and there are significant technical challenges confronting the development of advanced materials for Li-air batteries. NiCoO2, transition metal-doped perovskite oxide and Pd-based compotes have been invested in our group!A 3D foam-like NiCo2O4 catalyst has been synthesized. It demonstrated superior bi-functional electrocatalytic activities towards both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), with a relatively high round-trip efficiency of 70% and high discharge capacity of 10137 mAh g-1 at a current density of 200 mA g-1, which is much higher than those in previously reported results [1].

Transition metal-doped perovskite oxide LaNi0.9M0.1O3 (M=Cu, Co, Zn) has been grown on nickel foam with different morphology as carbon and binder free 3D air electrod. The lithium oxygen cell with nanoplate LaNi0.9Cu0.1O3 electrocatalyst grown on nickel foam exhibits great catalytic activity as an efficient bifunctional catalyst for the ORR and OER. Excellent cycling performace under 1000 mAh g-1 capacity limited mode is demonstrated, the discharge terminal voltage of stays above 2.36 V for 100 cycles under a current density of 0.1 mA g-1[2].

Carbon-free porous AgPd–Pd composite NTs were synthesized via a galvanic replacement reaction. The composite was used as a bifunctional electrocatalyst, showing favorable rechargeability and good electrocatalyst performance with a high round-trip effi ciency, owing to the high catalytic activity of the electrocatalyst and the abundant catalytic active sites provided by the porous NT structure [3].

References

[1] L. Liu, J. Wang et al, Small 12 (2016) 602.

[2] T. V. Pham, J.Z. Wang et al, J Mater. Chem A 5 (2017) 5289.

[3] W. B. Luo, J.Z. Wang et al, H.K. Liu, Adv. Mater 27 (2015) 6862.

Short Biography
TBA.
 
Talk Keywords
Li-oxygen batteries, air cathode material, catalyst.
 
Target Audience
Students, Post doctoral, Industry, Doctors and professors
 
Speaker-intro video
TBA
 

The International Conference on Innovative Applied Energy (IAPE’18)