Slide bài giảng hydrogen energy

hydrogen energyNew energy Renewable energy Non-polluted Future energy Apply in many fields... 2 ways to produce hydrogen water electrolysis by using solar energy and solar cell... Assu

Class of ‘K55 TT KH MT’

Thermochemistry

mini-project

Hydrogen [H] 

CAS-ID: 1333-74-0

An: 1  N: 0 Am: 1.00794 g/mol

Group No: 1 Group Name: Non-metals

Block: s-block 

Period: 1 State: gas at 298 K (the lightest gas known)

Color: colorless  Classification: Non-metallic Boiling Point: 20.268K (-252.87°C) Melting Point: 14.01K (-259.14°C) Critical temperature: 33K (-240°C)

Density: 0.08988g/cm3

H

hydrogen energy

New energy Renewable energy

Non-polluted Future energy Apply in many fields

2 ways to produce hydrogen

water electrolysis

by using solar energy and solar cell

photoelectrochemical

by using radiant and optical catalyst

the reaction for both method:

H2O  H2 + 1/2 O2 ΔH= 286 kJ/mol

energy comparison

When 1 mole of Hydrogen is burned, the energy released is:

H2+ O2 H2O ΔH = -286 kJ/mol

When 1 mole of gasoline, the main component is octane, is burned: C8H18 + O2 8CO2 + 9H2O ΔH = -269 kJ/mol

1 mol hydrogen gives more energy than 1 mol octane when we burn them in the engine

Calculate in mass Assume that we have 1 gram of hydrogen and 1 gram of gasoline(assume octane) are burned, the energy gained is:

1g hydrogen:

1g gasoline :

1g hydrogen burned gives more energy than 1g gasoline burned However,

- 1 L hydrogen in standard conditions contains 0.08388g H2 , being burned will released

0.08988x143=12.85kJ of energy

- while 1L gasoline(assume octane) in SC contains 718.96g of octane, being burned will released

718.96x2.36=2415.7kJ of energy

 Therefore 1L gasoline is more useful than 1L of hydrogen

However, the hydrogen fuel we use is in liquid phase that means

we have a lot of litters of hydrogen, so hydrogen is better

hydrogen replace gasoline  for transportation

There has been a lot of cars powered by hydrogen 

nstead of electricity

Hydrogen is used to produce electricity instead of fossil fuels, made ​​in the fuel cell

hydrogen space travel

In 1903, Konstantin Tsiolkovsky, a

Soviet rocket scientist and pioneer

of the astronautic theory, was the

first to theorize that the rockets

used for space travel needed to

be built in stages and hydrogen

and oxygen would be the most

powerful fuels to use

Konstantin Eduardovich Tsiolkovsky

17 Sep 1857 – 19 Sep 1935 Russian

Fields: Astronautic theory Known for: Tsiolkovsky's rocket equation

On July 20, 1969 the Apollo 11 Lunar Module, used liquid

hydrogen and nitrogen in the form of hydrazine (N2H4) as a propellant to both land and take off from the moon's surface

Today, NASA has used hydrogen for years to launch rockets and fuel space shuttles

The Space Shuttle uses fuel cells to create a maximum thrust level of

approximately 12,000,000 horsepower

In fact, every time we see a rocket launched on TV, the enormous thrust and cloud of smoke and fire is caused by the ignition of the liquid

hydrogen tanks

The interesting is hydrogen not only fuel supply but also

provides super clean water for the astronauts because water is a waste

of fuel cells

thank you

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