ESSAY ON:Hydrogen Production from Water and

Air Through Solid Oxide Electrolysis

To fulfill B.Sc. Degree of Science

Prepared by:

Haytham Ayman Nasser

4th Year Special Chemistry

Supervised by:

Dr. Mohamed Ismael Mohamed

Introduction Hydrogen plays an important role in the energy sector and is one

of the most important feedstocks for the production of hydrocarbon fuels and chemicals.

hydrogen does not exist in its pure state in nature, like oxygen.

Hydrogen has high energy density and environmental friendliness .

Hydrogen is an ideal energy carrier for renewable energy storage.

Currently, about 96 % of hydrogen is produced from fossil fuels .

The industrial processes produce significant amounts of CO2, which is a major green-house gas (GHG) and has a strong impact on global warming. Due to the depletion of fossil fuels

Schematic representation of the energy cycle using water splitting to store excess solar electrical energy and fuel cells to provide the electricity during the low peak period

Hydrogen is an ideal energy carrier for renewable energy storage

Classification of water electrolyzers

Solid Oxide Electrolysis Cells High-temperature solid oxide electrolyzers (SOEs) or solid oxide

elec-trolysis cells (SOECs) are electrochemical devices for the efficient production of hydrogen or syngas as feedstock for liquid fuels such as methanol, gasoline, and diesel using electricity and unused heat from nuclear plants,steelmakers, or renew-able energy sources.

Schematic diagrams of the operation principles of (a) solid oxide fuel cell (SOFC) and (b) solid oxide electrolysis cell (SOEC)

Effect of temperature on thermodynamic properties of the water electrolysis process.

Co-electrolysis of Steam and CO2 Via SOECs

Schematic of the proposed CO2-recycled synthetic fuel production process. –CH2-represents a hydrocarbon. HX heat exchanger

produces syngas (CO/H2 mixture) . Syngas is feedstock of liquid fuel such as gasoline or diesel production by Fischer-Tropsch synthesis route.

Co-electrolysis of Steam and CO2

Continued

Key Materials for SOECs

1)Electrolyte

The 8 mol% Y2O3-stabilized ZrO2 “yttria-stabilized zirconia” (YSZ) is a commonly used high-temperature electrolyte material

2)Oxygen Electrode

Sr-doped LaMnO3 “lanthanum strontium manganite” (LSM) perovskite oxide is a common oxygen electrode for high-temperature SOECs

3) Hydrogen Electrode

Ni cermet is a state-of-the-art hydrogen electrode of SOECs

Thank you