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Selection of oxygen reduction catalysts for rechargeable lithium-air batteries - Metal or oxide?

Lookup NU author(s): Dr Hua Cheng, Emeritus Professor Keith Scott

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Abstract

Carbon-supported Pd and PdO nanocatalysts were synthesised using either chemical reduction or thermal synthesis procedures and were used as model metal and oxide catalysts for oxygen reduction in rechargeable lithium-air batteries. The Pd metal catalyst showed excellent initial performance, e.g. a discharge capacity of 855 mAh (g solids)(-1). However, the PdO catalyst displayed superior capacity retention to the Pd catalyst, producing a discharge capacity of 336 mAh (g solids)(-1) after 10 cycles, i.e. the capacity retention was 6% per cycle. The activity and stability of Pd metal and oxide catalysts were found to be closely related to their intrinsic catalytic properties and structural changes during charge/discharge cycles in Li-air batteries. The implication of such a difference is discussed. Model Pd/C and PdO/C catalysts were compared with other widely used carbon-supported metal and oxide catalysts, including Pt/C, Ru/C, RuO2/C and MnO2/C. (C) 2011 Elsevier BM. All rights reserved.

Publication metadata

Author(s): Cheng H, Scott K

Publication type: Article

Publication status: Published

Journal: Applied Catalysis B: Environmental

Year: 2011

Volume: 108-109

Pages: 140-151

Print publication date: 25/08/2011

ISSN (print): 0926-3373

ISSN (electronic): 1873-3883

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.apcatb.2011.08.021

DOI: 10.1016/j.apcatb.2011.08.021

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