Question

What are noble electrodes? Explain their use.

Short answer

Answer: Noble electrodes are electrodes made from noble metals such as platinum, gold, and silver, which are highly resistant to oxidation and corrosion. They are commonly used in various applications like electrochemistry experiments, electroplating, electrolytic cells, and fuel cells, where precise control of electrode potentials or durability in harsh chemical environments is essential.

Step-by-step solution

Introduction to Noble Electrodes

Noble electrodes are electrodes made from noble metals, i.e., metals that exhibit high resistance to corrosion and oxidation. Some common noble metals include platinum, gold, and silver. Due to their resistance to chemical reactions, these electrodes maintain a stable potential or voltage when used in electrochemical processes.

Applications of Noble Electrodes

Noble electrodes find their applications in various fields, including the following: 1. Electrochemistry: In electrochemical experiments, noble electrodes, especially platinum, are employed as reference electrodes or working electrodes due to their stability in various chemical environments. This allows for accurate measurement and control of electrode potentials during the experiment without affecting the chemical processes occurring at the electrode surface. 2. Electroplating: Noble electrodes are often used as anodes in electroplating processes involving noble metals. Using a noble metal electrode ensures the consistent deposition of the desired metal ions on the cathode without the risk of anode corrosion introducing contaminants. 3. Electrolytic cells: In the production of chemicals using electrolytic cells, noble electrodes are particularly useful in the cells that involve harsh chemical environments or high potentials. For example, noble electrodes like platinum are employed in chlorine production cells to withstand the corrosive environment. 4. Fuel cells: Noble metal electrodes, particularly platinum, are utilized in fuel cells due to their excellent catalytic properties. For example, platinum is typically used as a catalyst in proton exchange membrane fuel cells (PEMFCs) for both the hydrogen oxidation (anode) and oxygen reduction (cathode) reactions.

Summary

In summary, noble electrodes are electrodes made from noble metals like platinum, gold, and silver, which are highly resistant to oxidation and corrosion. Their stability makes them ideal for various applications, including electrochemistry experiments, electroplating, electrolytic cells, and fuel cells, where precise control or durability is essential.