Which material is used as the positive electrode in an alkaline cell?

In alkaline cells, manganese dioxide serves as the positive electrode (cathode). This particular material is preferred because it has good electrochemical properties, which enhance the efficiency and performance of the battery. When the cell is in operation, manganese dioxide reacts with the electrolyte, typically potassium hydroxide in alkaline cells, facilitating the necessary electrochemical reactions that generate electrical energy.

Manganese dioxide's ability to readily accept electrons during discharge makes it effective for this application, ensuring a stable and sustainable reaction over the life of the battery. Its stability and ability to work effectively with the alkaline electrolyte contribute to the overall performance and longevity of alkaline batteries, making it a widely used choice in various consumer products.

Other materials mentioned, such as lead dioxide, copper oxide, and zinc oxide, are utilized in different types of batteries or applications but do not serve as the positive electrode in alkaline cells.