In this section, we talked about combining a solar cell with a photoelectrode to form a photoelectrochemical device. Why do we add a solar cell in the system?
a)Because the photoelectrode is not able to produce any voltage difference to drive the reaction
b)Because the photoelectrode is not able to produce any current to drive the reaction
c)Because the voltage difference created in the photoelectrode is not able to produce enough voltage to drive the reaction
d)Because the current created in the photoelectrode is not enough to drive the reaction
What is the approximate voltage that the solar cell needs to deliver for the photoelectrochemical device to work?
a)0.6V
b)1.23V
c)1.43V
d)0.8V
c)Because the voltage difference created in the photoelectrode is not able to produce enough voltage to drive the reaction
c 1.43V
c)Because the voltage difference created in the photoelectrode is not able to produce enough voltage to drive the reaction
c)1.43V
1-C
2-C(1.43V)
To determine why we add a solar cell to a photoelectrochemical device, we need to understand the role of each component. A photoelectrochemical device is designed to convert solar energy into chemical energy by driving a chemical reaction using photoelectrodes.
In this case, the photoelectrode alone is not able to produce enough voltage or current to drive the reaction.
So, our answer is either (a) or (c). However, to determine the approximate voltage that the solar cell needs to deliver for the device to work, we need to refer to the standard potential of the reaction involved in the photoelectrochemical reaction.
The standard potential is the voltage difference that a reaction requires to occur spontaneously at standard conditions. In this case, the standard potential for water splitting, which is a common reaction in photoelectrochemical devices, is approximately 1.23V.
Therefore, the approximate voltage that the solar cell needs to deliver for the photoelectrochemical device to work is (b) 1.23V.