SSCC4793 Photocatalytic Water Splitting for Hydrogen Production

Among the following, which has the highest energy density per unit mass?

• Coal

• Petroleum

• Hydrogen

• Helium

Water splitting by electrolysis does not produce any greenhouse gases.

• True

• False

In order to fully utilize solar energy for water splitting, a photocatalyst that needs UV light irradiation is most desired.

• True

• False

What did Fujishima and Honda do in 1972?

• Designed of a novel photocatalytic system using semiconductor photocatalysts.

• Reported photocatalytic water splitting using titania photocatalyst.

• Reported photocatalytic water splitting using a titania electrode.

What is a semiconductor?

• A material with highly insulating properties and low conductive properties

• A material which its properties are highly conductive

• A material with highly insulating properties

• A material which its electrical properties are between highly conductive materials and insulators

The material with the biggest forbidden gap is called ___________________.

• insulator

• conductor

• semiconductor

For the energy band diagrams shown, which one represents a semiconductor?

• a

• b

• c

From which material would it be most difficult to remove an electron?

Element (X) with a forbidden gap of 8 eV wide, element (Y) with a forbidden gap of 3eV wide or element (Z) with no forbidden gap?

• Element (X)

• Element (Y)

• Element (Z)

What is the corresponding wavelength for a material with band gap energy of 3.0 eV?

• 1000 nm

• 387 nm

• 427 nm

• 413 nm

Based on the picture, cadmium selenide (CdSe), with a band gap energy of 1.7 eV, can act as the photocatalyst for water splitting.

• True

• False