The energy required to displace water molecules from the hydration shell of an ion as it approaches the electrode surface constitutes an activation energy which can slow down the process.
Puzzled about the process, how can I get more knowledges about it ?
the Reduction process is always shown on the Right.
That's the rule. No matter where you are, everyone should not break it.
The major requirements of a reference electrode are that it be easy to prepare and maintain, and that its potential be stable.
There are many factors that affect the stability of the RE, such as temperature, impurities.