Interfacial Electrochemistry — DU B.Sc (hons) Chemistry Previous Year Question Papers

: DSE: INTERFACIAL ELECTROCHEMISTRY Maximuin Marks : 60 Attempt FOUR questions in all. 1. (a) Describe different models of the electrical double layer and highlight their limitations. (b) Explain electrocapillary phenomena, electrocapillary curve and potential of zero charge (PZC). (c) Give Tafel plot and the value of slope and intercept from the plot in terms of exchange current density and transfer coefficient. (5,5,5) 2. (a) Define overpotential? Differentiate activation, ohmic and concentration ` (b) If the oveapotential of an electrolyte process is increased from 0.5 V to 0.6 / V, then, calculate the ratio of current densities (1n io.6/io.5). (Given: Transfer coefficient is 0.5). (c) State the Butler-Volmer equation arid explain exchange current density and transfer coefficient. (5,5 ,5) 3. (a) What is transport number? How do concentration and ionic mobility affect it? (b) Distinguish reversible, quasi.-reversible and irreversible processes with cyclic voltammetry. (c) Explain different adsorption isotherms tised to describe surface a-dsoaption. 4. (a) Explain the principle and experimental setup of cyclic voltammetry. (b) What is HER, OER, and ORR? Explain briefly. (c) Explain the working of'direct methano.I fuel cell (DMFC). (5,5,5) 5. (a) Differentiate crevice and galvanic corrosion. (b) Explain cathodic protection and protective coating methods for corrosion prevention. (c) Explain the working of a Li-ion battery during charging and discharging. 6. Explain the following : (a) Redox flow batteries (b) EDLC and pseudo capacitors (c) Ionic atmosphere and electrophoretic effect (5,5,5)