Pd nanoparticles deposited on Co(OH) 2 nanoplatelets as a bifunctional electrocatalyst and their application in Zn–air and Li–O 2 batteries
The development of affordable electrocatalysts for both oxygen reduction and evolution reactions (ORR/OER) has received great interest due to their importance in metal–air batteries and regenerative fuel cells. We developed a high-performance bifunctional oxygen electrocatalyst based on Pd nanoparti...
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Published in | Nanoscale Vol. 12; no. 34; pp. 17858 - 17869 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
04.09.2020
|
Online Access | Get full text |
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Summary: | The development of affordable electrocatalysts for both oxygen reduction and evolution reactions (ORR/OER) has received great interest due to their importance in metal–air batteries and regenerative fuel cells. We developed a high-performance bifunctional oxygen electrocatalyst based on Pd nanoparticles supported on cobalt hydroxide nanoplatelets (Pd/Co(OH)
2
) as an air cathode for metal–air batteries. The Pd/Co(OH)
2
shows remarkably higher electrocatalytic activity in comparison with commercial catalysts (Pt/C, IrO
2
), including an ORR half-wave potential (
E
1/2
) of 0.87 V
vs.
RHE and an OER overpotential of 0.39 V at 10 mA cm
−2
in aqueous alkaline medium. The Zn–air battery constructed with Pd/Co(OH)
2
presents stable charge/discharge voltage (Δ
E
OER–ORR
= 0.69 V), along with durable cycling stability for over 30 h. Also, this cathode exhibits a maximum discharge capacity of 17 698 mA h g
−1
, and stable battery operation over 50 cycles at a fixed capacity of 1000 mA h g
−1
, as an efficient air electrode for Li–O
2
batteries, indicating that Pd/Co(OH)
2
can be a potential candidate for both aqueous and non-aqueous metal–air batteries. |
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ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/D0NR05403H |