Hydrogen-Production-from-Water-Electrolysis.pptx

Water Electrolysis

1. Hydrogen Production from Water Electrolysis Hydrogen has the potential to become a significant alternative fuel source. This presentation provides in-depth knowledge about the principles, types, cost, and challenges of hydrogen production through water electrolysis. KW by Kin Wai Cheah

2. The Basics of Hydrogen Production Water: the Fuel The concept of hydrogen production from water has been around for decades. Through electrolysis, hydrogen and oxygen can be separated from water molecules. Renewable Energy Sources The production of hydrogen from water can be achieved from any energy source, such as wind or solar. This makes it an eco-friendly and sustainable option. Fuel Cells Hydrogen obtained through water electrolysis is used as fuel in fuel cells, which generate electricity. Fuel cells have numerous applications, such as in vehicles and homes.

3. The Science of Water Electrolysis 1 Chemical Reaction Water is dissociated into hydrogen and oxygen through an electrochemical process, driven by a power source, such as electricity. 2 Electrolyte A substance, such as sodium hydroxide, is added to water to increase its electrical conductivity. The electrolyte is an essential part of the water electrolysis process. 3 Catalysts Catalysts such as platinum are added to the electrodes to speed up the reaction. A good catalyst can increase the efficiency of the process.

4. Types of Electrolyzers Alkaline Electrolyzers One of the oldest types of electrolyzers, they use a liquid electrolyte, such as potassium hydroxide, and are suitable for large-scale hydrogen production. PEM Electrolyzers They use a solid polymer electrolyte such as Nafion, and are suitable for small-scale hydrogen production. They require a lower temperature and pressure to operate. High-Temperature Electrolyzers They operate at higher temperatures, between 700-1000°C, using solid-state electrolytes such as doped-ceramics. They are suitable for high-temperature heat and steam production as well as hydrogen production.

5. Advantages and Disadvantages of Water Electrolysis Advantages ✅ Eco-friendly and sustainable Can be powered by renewable energy sources No carbon emissions Disadvantages ❌ The process is energy-intensive High capital and maintenance costs Scaling up for commercial use is challenging

6. Cost Analysis of Hydrogen Production Alkaline
Electrolyzers PEM
Electrolyzers Investment Cost Low High Operational Cost Low High Efficiency 70% 80% The cost of hydrogen production via water electrolysis has been decreasing rapidly. The cost of renewable energy sources has a significant impact on the cost of hydrogen produced.

7. Applications of Hydrogen Produced by Electrolysis 1 Transportation Hydrogen fuel cells can power vehicles such as cars, trucks, trains, and buses. They emit only water, and provide a longer range than battery-powered vehicles. 2 Energy Storage The use of hydrogen as a form of energy storage is an alternative to traditional batteries. It can store excess renewable energy from solar and wind sources and provide grid stability. 3 Industry Hydrogen can replace fossil fuels in various industrial applications such as refining, chemical production, and power generation.

8. Challenges and Future Prospects Renewable Energy Sources The availability of cheap renewable energy is crucial to reduce the cost of hydrogen production through water electrolysis. Energy Efficiency Improvements in the efficiency of the electrolysis process can reduce energy consumption, and therefore the cost of the hydrogen produced. Storage and Transportation Hydrogen has a low volumetric energy density, which poses a challenge for its storage and transportation. Innovations are being developed to overcome this challenge.