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Which of the effects listed below are considered to be main limiting factors for increasing the current density of the photoelectrodes?Note that more than one correct answer is possible.

A. Band gap of the semiconductor forming the photoelectrode
B. Reflection in the electrolyte between the light source and the photoelectrode
C. Separation of charges in the photoelectrode semiconductor material
D. Catalytic effects in the photoelectrode surface
E. Mass transport of the ion within the electrolyte

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We want to build a photoelectrochemical device by joining a \(BiVO_4\) photoanode and a double junction amorphous silicon solar cell. The J-V curves of both the photoanode and the solar cell are given in the graph.These curves are measured at an irradiance of \(1000W/m^2\). As explained in the video lectures, the solar-to-hydrogen efficiency is given by:\(\eta_{STH}=\frac{J_{photo}*1.23V}{P_0}\)Calculate the solar-to-hydrogen efficiency of the device and give it as a percentage: ______

The cycle in the figure has been explained during the lectures. It shows the route to convert the hydrogen produced by water splitting into natural gas.The following efficiencies are considered:Based on the above given conversion efficiencies, calculate the efficiency of the complete process in %:Other version of a hydrogen cycle in a hydrogen based economy is to directly store and convert the hydrogen into energy, as in the scheme shown here.The following efficiencies are considered:Calculate the efficiency of the complete process in %:Regarding the calculations you performed, which method will you chose to use the hydrogen produced during electrolysis:

A. Option 1: Use the hydrogen in WGS and FT reactions to obtain \(CH_4\)
B. Option 2: Directly store and use the hydrogen produced
C. Both options are equally good

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The cycle in the figure has been explained during the lectures. It shows the route to convert the hydrogen produced by water splitting into natural gas.The following efficiencies are considered:Based on the above given conversion efficiencies, calculate the efficiency of the complete process in %:Other version of a hydrogen cycle in a hydrogen based economy is to directly store and convert the hydrogen into energy, as in the scheme shown here.The following efficiencies are considered:Calculate the efficiency of the complete process in %: ______

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The cycle in the figure has been explained during the lectures. It shows the route to convert the hydrogen produced by water splitting into natural gas.The following efficiencies are considered:Based on the above given conversion efficiencies, calculate the efficiency of the complete process in %: ______

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