ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Lithium-electroactive peroxidase-like MnO₂ nanomaterials as an ultrasensitive and selective sensing platform for carcinogenic 3,3′-diaminobenzidine and high-capacity lithium-ion batteries cathode materials

Saeed Reza Hormozi Jangi

Hormozi Laboratory of Chemistry and Biochemistry, Zabol, Iran

E-mail: saeedrezahormozi@gmail.com

Received: 2 January 2024  Accepted: 20 April 2024

Abstract:

In this study, the lithium-electroactive peroxidase-like MnO₂ nanomaterials were utilized as ultrasensitive and selective sensing platforms for carcinogenic 3,3′-diaminobenzidine and high-capacity lithium-ion batteries cathode materials. The peroxidase-like MnO₂ nanomaterials revealed an enzyme-like activity as high as 3 µM sec^–1 mg^–1, making them suitable for nanozymatic sensing of carcinogenic 3,3′-diaminobenzidine. Under optimal conditions, a wide linear range over 0.05–500 µM, a very low detection limit of 0.047 µM, an intra-day %RSD of 1.9%, and an inter-day %RSD of 3.4% were provided. The method showed ultra-selectivity against metal ions, amino acids, and antioxidants and was applicable for 3,3′-diaminobenzidine quantification in both real water and blood serum samples. Moreover, due to the Li-electroactivity of these nanozymes, they were applied as new cathode materials for lithium-ion batteries. The cyclic voltammetry revealed a reversible redox behavior which pointed out that the MnO₂ nanozymes as cathode materials can receive the Li⁺ ions, and then give it back to the anode (i.e., proceeding lithiation/de-lithiation process). Besides, the charge–discharge tests showed capacities as high as 164.9 mAh g^–1 and 46 mAh g^–1 at 30 mA g^–1 and 1000 mA g^–1, in turn, revealing the suitability of these nanozymes as cathode materials for lithium-ion batteries.

Keywords: Lithium-electroactive peroxidase-like MnO2 nanomaterials; Sensing platform for carcinogenic 3,3′-diaminobenzidine; Nanozymes as cathode materials; Lithium-ion batteries

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03476-5

Chemical Papers 78 (9) 5367–5379 (2024)