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Exploring discharged dry cell as an electrocatalyst for oxygen evolution reaction
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Exploring discharged dry cell as an electrocatalyst for oxygen evolution reaction
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Journal Article
Exploring discharged dry cell as an electrocatalyst for oxygen evolution reaction
2024
Overview
Transition metal compounds with a high affinity for oxygen in dry cell configurations, such as MnO 2 , Mn 3 O 4 , and Zn x Mn 3 O 4−x , exhibit exceptional electrocatalytic properties in the oxygen evolution reaction (OER). However, the disposal of these dry cell materials, unlike that of rechargeable batteries, poses environmental hazards. In this study, we focused on optimizing these manganese oxides for energy-related applications, specifically OER. To achieve this goal, we investigated the electrocatalytic behaviour of both used and fresh dry cells in OER. Our results show that the used dry cell material achieved a current density of 10 mA·cm −2 at an overpotential of 525 mV, whereas the fresh dry cell required an overpotential 100 mV higher to reach the same current density. We further characterized the nature of these fresh and used materials using various techniques, including x-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), and contact angle measurements. The enhanced activity of the used dry cell can be attributed to the formation of highly active Mn 3 O 4 from MnO 2 and graphene oxide under discharging conditions.
