FABRICATION OF MAGNESIUM-AIR BATTERY WITH MANGANESE OXIDE ELECTROCATALYST AND SEAWATER ELECTROLYTE FOR COASTAL SETTLEMENT AND FISHERIES CULTIVATION

• Main Author: Mulyadewi, Anggraeni
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/54761
• Institution: Institut Teknologi Bandung

Magnesium-air battery is one type of air metal battery that is very promising to be applied further due to its lightweight, cheap, and capability to produce high specific voltage and capacity. Batteries using magnesium metal as an anode will be very reactive to the environment around them. It takes the right type of electrolyte for the battery to have good performance. A magnesium-air battery performs well on neutral pH electrolytes. Based on this, seawater currently excludes an effective local resource to be used as an electrolyte for magnesium-air batteries. This is supported by the strategic geographic location of Indonesia, which makes it possible to utilize seawater for practical battery manufacturing with low production costs compared to other conventional batteries. Although magnesium-air batteries have a high theoretical specific voltage and capacity, practically, it is difficult to achieve the theoretical specific voltage and capacity. This is due to the corrosion reaction of the metal anode and the slow kinetics of the oxygen reduction reaction. Hence, an electrocatalyst is needed to accelerate the oxygen reduction reaction and increase the performance of the battery. MnOx (manganese oxide) is a good candidate for electrocatalyst, which has been widely used in metal-air batteries. Unfortunately, limited studies have been conducted using manganese oxide as electrocatalysts in magnesium air batteries. Magnesium-air battery with manganese oxide electrocatalyst grown via a simple immersion process and seawater electrolyte showed a good performance with an open circuit voltage of 1,815 V, a peak power density of 17,89 mW cm-2, a capacity of 1428.5 mAh g-1 during 24 hours testing, and an average discharge voltage of 1.34 V. As the batteries exhibit a promising performance, it is hoped that the results can help to advance the research on magnesium air batteries as batteries with good practicality, good performance, and environmentally friendly.