Describe the bulk preparation of dihydrogen by the electrolytic method. What is the role of an electrolyte in this process?

(N/A) The electrolytic method for the bulk preparation of dihydrogen involves the following processes:
$(i)$ Electrolysis of acidified water: Pure water is a poor conductor of electricity. Therefore,traces of an acid or base are added to make it conducting. Electrolysis of this acidified water using platinum electrodes yields hydrogen at the cathode.
$2 H_2O_{(l)} \stackrel{\text{Electrolysis}}{\text{Traces of acid/base}} 2 H_{2_{(g)}} + O_{2_{(g)}}$
$(ii)$ Electrolysis of aqueous barium hydroxide: High purity $(> 99.95 \%)$ dihydrogen is obtained by electrolysing a warm aqueous solution of barium hydroxide between nickel electrodes.
$(iii)$ Electrolysis of brine: Dihydrogen is obtained as a byproduct in the manufacture of sodium hydroxide and chlorine by the electrolysis of brine solution ($NaCl$ solution).
At anode: $2 Cl_{(aq)}^{-} \longrightarrow Cl_{2_{(g)}} + 2 e^{-}$
At cathode: $2 H_2O_{(l)} + 2 e^{-} \longrightarrow H_{2_{(g)}} + 2 OH_{(aq)}^{-}$
Role of electrolyte: Pure water is a poor conductor of electricity due to very low ionization. The electrolyte (acid,base,or salt) increases the concentration of ions in the solution,thereby increasing its electrical conductivity and facilitating the flow of current required for the electrolysis process.