green technology 2 final

7/31/2019 Green Technology 2 Final

1/16

GREEN TECHNOLOGY

Done by:

Elizabeth Ho and George Lim

4Ch6


2/16

What Is Green Technology?

Green technology, or clean technology,

refers to use of technology that makes

products and processes more eco-friendly

based on its manufacturing process andsupply chain

Overall aim: contribution to sustainability of

environment


3/16

*Energy production from green technology less harmful toenvironment than usual ways of generating energy such

as burning fossil fuels

*Green technology facilities require less maintenance so it

is cheap to operate*Can bring economic benefits to certain areas e.g. boost

tourism

*Uses science to preserve natural environment and

resources and also to reduce human impact on Earth


4/16

*Amount of energy generated not consistent e.g. if certainarea relies on solar energy and there is weather

disturbance, conversion of sunlight into electricity is not

possible

*Green technology facilities expensive to build

*Building these facilities also requires lot of land so people

may have to cut on land usage

*Some of these facilities can only be set up in certain

areas. For example, wave energy can only be produced ifwaves reach at least 16 feet.


5/16

There are many examples of green technology,

but we have decided to focus on the use of

hydrogen fuel cells in electric cars and solar

energy. In the next few slides we will give a brief

description of these examples, talk about how

chemistry is applied to these examples in such

cars and the advantages of using these forms ofgreen technology.


6/16

Introduction

0Electric cars use hydrogen as a power

source for their engines

0Chemical energy of hydrogen converted

into electrical energy to power these cars


7/16

Fuel Cells

O Devices in which a fuel (hydrogen) reacts with oxygen in air to produceelectrical energy directly

O Operate like batteries but does not run down or require recharging like

batteries

O Produce energy in form of electricity and heat as long as fuel

(hydrogen) and oxygen supplied

O Consist of two catalyst-coated electrodes (porous anode and cathode)

inserted round an electrolyte

O Oxygen passes over one electrode and hydrogen over the other,

generating electricity, water and heat


8/16

How Fuel Cells Work

At cathode, oxygen is passed into it and is reduced

Reaction: Oxygen + 2H2O (water) + 4e => 4OH-

At anode, hydroxide ions formed are removed from the fuel

cell by reaction with hydrogen

Reaction: 2H2 (hydrogen) + 4OH- => 4H2O + 4e

Electrons produced by this process pass around electrical

circuit to the cathode

Overall equation:

2H2 + O2 => 2H2O


9/16

Proton Exchange Membrane

So this reaction produces water only as you can see what

happened to the 4 electrons?

This membrane allows the Protons from the Hydrogen to pass

through to form with the Oxygen to produce water.

However the electrons which are not allowed to be passed

through have to travel around the cell to get to the Cathode

Producing the electrical energy

This is a link to a animation showing how the

fuel cell works.

http://www.fctec.com/flashfiles/howWorks.ht

ml
http://www.fctec.com/flashfiles/howWorks.htmlhttp://www.fctec.com/flashfiles/howWorks.htmlhttp://www.fctec.com/flashfiles/howWorks.htmlhttp://www.fctec.com/flashfiles/howWorks.html


10/16

They dont release harmful gases to the environment. (eg.Oxides of Nitrogen) which contributes to Global warming.

The fuel cells can be stacked up to add more Power tothe car

There is fewer parts then in a traditional car so there islesser noise and the car runs smoother with lesservibrations.

Overall More efficient.

More efficient than internal combustion engines asenergy is directly converted to electrical energy


11/16

Solar Panels for Solar Energy

Solar Cells work on the basics of Photovoltaics.

Photovoltaics is when certain materials are exposed to light

and they release electrons. By absorbing the photons in the

air.


12/16

How it works

The base material for solar cells are usually Silicon. It is then

treated with certain other metals to cover the top and bottom

layer of It to allow photovoltaics to take place to change the

photons into electrical energy.

Multiple cells can then be stacked together to create a largepanel for more surface area for the sun to allow more power

produced.


13/16

Pros and Cons

Installing or making a solar panel may be expensive but after

the initial fee the cost of the panel is practically free.

Save money on electricity bills

There are also certain schemes produced by certain utility

companies that buy your electricity from you if you producemore than you need!

Solar energy is clean and does not pollute the environment

Does not use any fuel so it does not contribute to Global

Warming Solar Panels are independent. So it does not run on a power

grid .


14/16

References http://lexicon.ft.com/ft/glossary/term.asp?t=green-technology

http://www.investopedia.com/terms/g/green_tech.asp

http://www.greenenergytechnology.org/tag/advantages-and-

disadvantages-of-green-technology

http://www.wipo.int/wipo_magazine/en/2007/01/article_0001.html

http://www.greenstudentu.com/encyclopedia/green_vehicle_guide/h

ydrogen_fuel http://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybri

d_fuelcell_and_electric_vehicles/fuel-cell-vehicles.html

http://www.fctec.com/fctec_basics.asp

http://www.fueleconomy.gov/feg/fcv_PEM.shtml

http://www.fuelcells.org/basics/how.html

http://www1.eere.energy.gov/hydrogenandfuelcells/fuelcells/basics.h

tml

http://www.environment-green.com/Green_Technology.html
http://lexicon.ft.com/ft/glossary/term.asp?t=green-technologyhttp://www.investopedia.com/terms/g/green_tech.asphttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.wipo.int/wipo_magazine/en/2007/01/article_0001.htmlhttp://www.greenstudentu.com/encyclopedia/green_vehicle_guide/hydrogen_fuelhttp://www.greenstudentu.com/encyclopedia/green_vehicle_guide/hydrogen_fuelhttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.fctec.com/fctec_basics.asphttp://www.fueleconomy.gov/feg/fcv_PEM.shtmlhttp://www.fuelcells.org/basics/how.htmlhttp://www1.eere.energy.gov/hydrogenandfuelcells/fuelcells/basics.htmlhttp://www1.eere.energy.gov/hydrogenandfuelcells/fuelcells/basics.htmlhttp://www.environment-green.com/Green_Technology.htmlhttp://www.environment-green.com/Green_Technology.htmlhttp://www.environment-green.com/Green_Technology.htmlhttp://www.environment-green.com/Green_Technology.htmlhttp://www1.eere.energy.gov/hydrogenandfuelcells/fuelcells/basics.htmlhttp://www1.eere.energy.gov/hydrogenandfuelcells/fuelcells/basics.htmlhttp://www.fuelcells.org/basics/how.htmlhttp://www.fueleconomy.gov/feg/fcv_PEM.shtmlhttp://www.fctec.com/fctec_basics.asphttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.ucsusa.org/clean_vehicles/technologies_and_fuels/hybrid_fuelcell_and_electric_vehicles/fuel-cell-vehicles.htmlhttp://www.greenstudentu.com/encyclopedia/green_vehicle_guide/hydrogen_fuelhttp://www.greenstudentu.com/encyclopedia/green_vehicle_guide/hydrogen_fuelhttp://www.wipo.int/wipo_magazine/en/2007/01/article_0001.htmlhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.greenenergytechnology.org/tag/advantages-and-disadvantages-of-green-technologyhttp://www.investopedia.com/terms/g/green_tech.asphttp://lexicon.ft.com/ft/glossary/term.asp?t=green-technologyhttp://lexicon.ft.com/ft/glossary/term.asp?t=green-technologyhttp://lexicon.ft.com/ft/glossary/term.asp?t=green-technology


15/16

References

http://www.facts-about-solar-energy.com/solar-energy-

advantages-disadvantages.html

http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/

http://science.howstuffworks.com/environmental/energy/solar-cell2.htm

http://www.wisegeek.com/how-do-solar-panels-work.htm
http://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.howstuffworks.com/environmental/energy/solar-cell2.htmhttp://science.howstuffworks.com/environmental/energy/solar-cell2.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://www.wisegeek.com/how-do-solar-panels-work.htmhttp://science.howstuffworks.com/environmental/energy/solar-cell2.htmhttp://science.howstuffworks.com/environmental/energy/solar-cell2.htmhttp://science.howstuffworks.com/environmental/energy/solar-cell2.htmhttp://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://science.nasa.gov/science-news/science-at-nasa/2002/solarcells/http://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.htmlhttp://www.facts-about-solar-energy.com/solar-energy-advantages-disadvantages.html


16/16

We hope you enjoyed our presentation!

green technology 2 final

Documents