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Enhancing Bifunctional Catalytic Activity via a Nanostructured La(Sr)Fe(Co)O3−δ@Pd Matrix as an Efficient Electrocatalyst for Li–O2 Batteries
journal contribution
posted on 2019-12-10, 19:09 authored by Mi Young Oh, Jung Hyun Kim, Young Wook Lee, Kyeong Joon Kim, Hong Rim Shin, Hyeokjun Park, Kang Taek Lee, Kisuk Kang, Tae Ho ShinOne of the important challenges with a bifunctional electrocatalyst
is reducing the large overpotential involved in the slow kinetics
of the oxygen evolution reaction (OER) and oxygen reduction reaction
(ORR) at the air electrode in a metal–air redox battery. Here,
we present a nanostructured LSCF@Pd matrix of nanostructured LSCF
(Nano-LSCF) with palladium to enhance the bifunctional catalytic activity
in Li–O2 battery applications. Pd nanoparticles
can be perfectly supported on the surface of the Nano-LSCF, and the
ORR catalytic activity was properly improved. When Nano-LSCF@Pd was
applied to a cathode catalyst in Li–O2 batteries,
the first discharge ability (16912 mA h g–1) was
higher than that of Nano-LSCF (6707 mA h g–1) and
the cycling property improved. These results demonstrate that the
Pd-deposited nanostructured perovskite is a capable catalyst to enhance
the ORR activity of LSCF as a promising bifunctional electrocatalyst.