What technique was selected for preparing low-loading ammonia electrocatalysts?

• Electroplating

• Electrodeposition

• Electrolysis

• Electrophoresis

What is the ammonia oxidation potential at 25°C versus standard hydrogen electrode (SHE)?

• -0.77 V

• -0.83 V

• -0.67 V

• -0.73 V

Tags

NGSS.HS-PS1-4

NGSS.HS-PS2-5

According to the text, what is the energy consumption for the electrolysis of water at standard conditions?

• 1.55 W h g⁻¹ H₂

• 33 W h g⁻¹ H₂

• 95% lower energy

• 1 mA cm⁻²

Which metals were found to have the best activity among noble and coinage metals toward ammonia oxidation?

• A) Gold and silver

• B) Platinum and iridium

• C) Copper and zinc

• D) Iron and nickel

What is the composition of the deposit on the Pt–Ru electrode?

• 13% Ru, rest Pt

• 10% Ir, rest Pt

• 100% Pt

• 50% Ru, 50% Pt

What is the expected outcome of using a more porous deposit in the electropolishing solution?

• Increased hydrogen evolution

• Decreased hydrogen evolution

• No change in hydrogen evolution

• Increased oxygen evolution

What is the function of the Kratos XSAM800 electron spectrometer?

• To measure atomic composition

• To enhance scattering from oxygen

• To analyze X-ray photoelectron spectroscopy

• To measure hydrogen evolution

What is the atomic percentage of Ir in the Pt–Ir electrode?

• 10%

• 13%

• 100%

• 0%

What is the chemical reaction for the electrolysis of ammonia as shown in Eq. (4.1)?

• NH3 + H2O → NH4+ + OH-

• NH3,ads + OH- ↔ NH2,ads + H2O + e-

• NH3 + O2 → NO2 + H2O

• NH3 + H2 → NH4 + H2O

Tags

NGSS.HS-PS1-4

What is the maximum current density obtained on Pt-Ir at 60°C?

• 50 mA cm−2

• 60 mA cm−2

• 70 mA cm−2

• 80 mA cm−2

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5