Cathode Design with MWCNT-Mn3O4-PtNps Modified Pencil Graphite Electrode for Enzyme-Nanozyme Based Biofuel Cell.

Emir Günay G., Dilgin Y., Şahin S., Akgül C.

5th ICABC, Antalya, Turkey, 4 - 07 March 2024, pp.86

  • Publication Type: Conference Paper / Summary Text
  • City: Antalya
  • Country: Turkey
  • Page Numbers: pp.86
  • Çanakkale Onsekiz Mart University Affiliated: Yes

Abstract

Enzymatic biofuel cells (EBFCs) using enzymes as biocatalysts are highly efficient devices that convert the chemical energy stored in fuel directly into electricity and have been widely studied due to their many benefits1. In this process, fuel is oxidized at the anode by enzymatic reactions while oxygen is typically reduced at the cathode2. In this study, we presented an EBFC that contains the glucose oxidase (GOx) based composite anode and multiwalled carbon nanotube (MWCNT), manganite (Mn3O4) and metal nanoparticles (MNps) composite based cathode. The anode was modified with MWCNT and ferrocene (Fc) as a conductive layer and the enzyme GOx as a sensitive detection layer for glucose. On the other hand, the cathode consisted of MWCNT-Mn3O4-PtNps composite modified pencil graphite electrode (PGE) for oxygen reduction reaction because of their good conductivity and electron transfer rate. The best results were obtained with the anode containing MWCNT (5.0 mg/mL), Fc (25 mM), and GOx (20 mg/mL) modified glassy carbon electrode and for  the cathode containing MWCNT (1.0 mg/mL), Mn3O4 (1.0 mg/mL), and PtNps (5.0 mM) modified PGE. The performance of the EBFC was investigated using a potentiostat/galvanostat. It was found that the EBFCs produced an open circuit voltage of 0.305 V and a maximum power density of 42.05 μW cm−2. The proposed EBFC is a highly promising candidate for detecting glucose while simultaneously harvesting power from various glucose samples.