Explain construction and working of standard Hydrogen electrode?

Dear Student,


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In electrochemistry Hydrogen Electrode are ?reference electrodes whose potential marks the zero level ?for all ?redox ?half reactions .


Normal hydrogen electrode set up consists of platinum wire or sheet coated with platinum salt to form a layer of metallic platinum and immerse in the solution of 1N HCL[ 1N =1 M] ? and Hydrogen gas is bubbbled ?at 1atm pressure through the solution.The Gas molecules are absorbed to the platinum layer forming a hydrogen electrode ?and increase the space for chemical reaction.The platinum surface appear dark due to absorption of light.The hydrogen electrode is the only metallic electrode which does not consists of solid metal in equilibrium.But Normal hydrogen electrode is reversible and its potential will change with time,so that it cannot be used as reference.
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