Dear colleagues. I'm studying ORR on carbon materials, including graphene oxide. I'm new in this research direction and have questions: what are the compositions of the most suitable electrolytes for ORR on carbon materials? In many research papers, 0.1M KOH is presented as the most suitable one. But, acidic and neutral solutions could also be good? I need the clear understanding of the rules behind choosing the electrolyte for ORR. Any good papers, clear answers, please, share with me.
Selecting the most suitable electrolyte for the Oxygen Reduction Reaction (ORR) on carbon materials involves a complex interplay of factors. While 0.1M KOH (potassium hydroxide) is commonly used and has been shown to be effective for some applications, the choice of electrolyte depends on various considerations including electrode materials, operating conditions, and specific goals of the electrochemical system.
Here are some points to consider:
The choice of electrolyte should be guided by these factors:
- Electrode Material: Different carbon materials have varying responses to different electrolytes. Conductivity and stability of the electrode material in the chosen electrolyte play a significant role.
- Reaction Mechanism: The reaction mechanism of the ORR can vary depending on the pH and electrolyte composition. This can influence reaction kinetics and overall performance.
- System Requirements: Consider the specific requirements of your system, such as operating conditions (temperature, pressure), energy efficiency, and the overall electrochemical setup.
- Corrosion: Some electrolytes might lead to electrode corrosion, limiting the durability of the system. Compatibility with electrode materials is crucial.
- Literature and Experimentation: Reviewing literature on ORR studies for carbon materials can provide insights into the success of various electrolytes. Additionally, conducting experiments with different electrolytes under controlled conditions can help determine the optimal choice.
- Application: The intended application of the electrochemical system is important. For example, fuel cells, metal-air batteries, and electrochemical sensors might have varying electrolyte requirements.
Dear Ekaterina Chernova The choice of electrolyte for ORR depends on the target application the catalyst and operating conditions in particular electrochemical systems, such as fuel cells and metal-air batteries. Generally, the acidic electrolyte (0.1 M HClO4) is used for ORR electrocatalyst in proton exchange membrane fuel cells. While alkaline electrolytes (0.1 OR 1 M KOH) are used for metal-air batteries.
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