Question

7. Artificial photosynthesis is an emerging technology to produce chemical fuels from abundant renewable resources by using sunlight, based on principles learned from Nature For example, huge efforts have been made to develop photoelectrochemical system to produce hydrogen gas by electrolysis of water, also known as water-splitting. In principle, it is very clean and sustainable process because it uses water and sunlight as a raw byproduct. Answer the following questions. (total 25 pt) (c) Find the mathematical expression of relationship between pH and a half cell potential (vs. Ag/AgCl) for both cathodic and anodic reactions. (5 pt) (d) Based on your finding in (c), draw a Pourbaix diagram for water electrolysis. Using your Pourbaix diagram, determine which species (H2, O2, and H2O) thermodynamically stable at a given potential and pH. For your information, a Pourbaix diagram is a plot of the equilibrium potential of electrochemical reactions against pH. (5 pt)

Answer 1

0.059 with a〉 latin Stable 4 6 PH