Carbon/titanium oxide supported bimetallic platinum/iridium nanocomposites as bifunctional electrocatalysts for lithium-air batteries |
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| Authors: | Awan Zahoor Maria Christy Yongbin Kim Anupriya Arul Yun Sung Lee Kee Suk Nahm |
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| Affiliation: | 1.Department of Chemical Engineering,N.E.D. University of Engineering and Technology,Karachi,Pakistan;2.R&D Education Centre for Fuel Cell Materials & Systems,Chonbuk National University,Jeonju,Republic of Korea;3.Department of Semiconductor and Chemical Engineering,Chonbuk National University,Jeonju,Republic of Korea;4.Faculty of Applied Chemical Engineering,Chonnam National University,Gwangju,Republic of Korea |
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| Abstract: | Platinum (Pt) and iridium (Ir) catalysts are well known to strongly enhance the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics, respectively. Pt–Ir-based bimetallic compounds along with carbon-supported titanium oxides (C–TiO2) have been synthesized for the application as electrocatalysts in lithium oxygen batteries. Transition metal oxide-based bimetallic nanocomposites (Pt–Ir/C–TiO2) were prepared by an incipient wetness impregnation technique. The as-prepared electrocatalysts were composed of a well-dispersed homogenous alloy of nanoparticles as confirmed by X-ray diffraction patterns and Fourier transform scanning electron microscopy analyses. The electrochemical characterizations reveal that the Pt–Ir/C–TiO2 electrocatalysts were bifunctional with high activity for both ORR and OER. When applied as an air cathode catalyst in lithium-air batteries, the electrocatalyst improved the battery performance in terms of capacity, reversibility, and cycle life compared to that of cathodes without any catalysts. |
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