Catalase‐Based Air‐Cathode for Biocompatible Zinc–Air Battery

The use of catalase (CAT) from bovine liver as an electrocatalyst in the air electrode of a primary zinc–air battery (ZAB) with neutral electrolyte (pH 7.4) is reported. First, the use of Nafion for immobilizing CAT onto electrode surface allowed to obtain long‐term stability of the catalytic activi...

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Bibliographic Details
Published in:ChemCatChem 2025-02, Vol.17 (3), p.n/a
Main Authors: García‐Caballero, Valentín, López‐León, Miguel, Abad, José, Mellado, José M. Rodríguez, Giner‐Casares, Juan J., Romero, Antonio J. Fernández, Cano, Manuel
Format: Article
Language:English
Subjects:
Batteries
Biocompatibility
Catalase
Catalytic activity
Chemical reduction
Electrocatalysis
Electrocatalysts
Electrodes
Energy
Metal air batteries
Oxygen reduction reactions
Rotating disks
Surface stability
ZABs
Zinc-oxygen batteries
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Summary:The use of catalase (CAT) from bovine liver as an electrocatalyst in the air electrode of a primary zinc–air battery (ZAB) with neutral electrolyte (pH 7.4) is reported. First, the use of Nafion for immobilizing CAT onto electrode surface allowed to obtain long‐term stability of the catalytic activity of CAT. Besides, analysis of the CAT and CAT‐Nafion as catalysts for oxygen reduction reaction (ORR) was carried out by linear sweep voltammetry (LSV) using a rotating ring‐disk electrode (RRDE), demonstrating a four‐electron ORR mechanism. Finally, CAT and CAT‐Nafion were tested as air electrodes in flooded ZAB and compared against human hemoglobin‐based ZAB. Our results demonstrated the significant influence of the protein coating of the heme groups on the ZAB performance, affecting greatly the discharge capacity and the power density. This article highlights the use of catalase (CAT) as electrocatalyst for the oxygen reduction reaction (ORR) in the air electrode of zinc–air batteries (ZABs). CAT immobilized with Nafion on electrode surfaces demonstrates great long‐term stability, exhibiting direct electrochemical response and retaining its bioactivity. CAT‐Nafion ZAB provides better specific capacities than hemoglobin‐Nafion ZAB at low discharge intensity, demonstrating the significant influence of the heme group protein coating on the ZAB performance.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.202401343