Regulating oxygen activation and catalytic kinetics in ZnCo 2 O 4 nanozymes via Mn substitution: insights into the oxidase-like activity mechanism

Mn substitution in ZnCo 2 O 4 tuned redox properties and enhanced oxidase-like activity. Mn–O–Co centers promoted O 2 activation and electron transfer. A colorimetric platform reliably detected ascorbic acid in juice, proving cation tuning for nanozymes.