Question

I am using silver oxide as a cathode because it's common. I was reading that some solid metal oxides (e.g., silver oxide, lead dioxide, and manganese dioxide) possess high redox potentials. Manganese dioxide and lead dioxide are usually not employed as electron acceptors but as catalysts for oxygen reduction

Silver oxide/silver (Ag2O/Ag) couple has been used for decades in alkaline batteries. The standard reduction potential of Ag2O/Ag is 0.342 V vs the standard hydrogen electrode (SHE).

What is an example of another electron acceptor metal oxide I can use that might have a higher voltage than silver oxide?

Answer 1

Manganese dioxide (MnO2/Mn) is an electron acceptor metal oxide with higher voltage (approx. 1.23 V) versus SHE compared to silver oxide.

Step-by-step explanation:

An example of another electron acceptor metal oxide with a higher voltage than silver oxide (Ag2O/Ag) could be manganese dioxide (MnO2/Mn).

Manganese dioxide is often used as a catalyst in lithium batteries and has a standard reduction potential of approximately 1.23 V versus the standard hydrogen electrode (SHE), which is significantly higher than the 0.342 V of silver oxide.

This makes MnO2 a strong oxidant and therefore an effective electron acceptor in electrochemical reactions.