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Toward enhanced hydrogen generation from water using oxygen permeating LCF membranes
Xiao-Yu Wu1, Le Chang, Mruthunjaya Uddi
1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. xywu@mit.edu ghoniem@mit.edu.
Physical Chemistry Chemical Physics : PCCP
|March 20, 2015
Summary
This study demonstrates that La0.9Ca0.1FeO3-δ (LCF-91) perovskite membranes enhance hydrogen production via water thermolysis. Adding fuel to the sweep gas significantly boosts hydrogen generation rates.
Area of Science:
- Materials Science
- Chemical Engineering
- Electrochemistry
Background:
- Hydrogen production is crucial for clean energy.
- Perovskite-type mixed ionic-electronic conducting (MIEC) membranes offer a pathway for enhanced hydrogen production through water thermolysis.
- La0.9Ca0.1FeO3-δ (LCF-91) is a promising MIEC material for such applications.
Purpose of the Study:
- To investigate the efficiency of La0.9Ca0.1FeO3-δ (LCF-91) perovskite membranes for hydrogen production via water thermolysis at high temperatures.
- To analyze the impact of operating conditions on water thermolysis rate and oxygen flux.
- To elucidate the rate-limiting steps in oxygen permeation through LCF-91 membranes under various conditions.
Main Methods:
- Lab-scale button-cell reactor experiments using 0.9 mm thick LCF-91 membranes at 990 °C.
- Systematic variation of gas species concentrations and flow rates on feed and sweep sides.
- Development and application of a three-resistance permeation model.
- Comparison of oxygen fluxes in water thermolysis and air separation.
Main Results:
- Water thermolysis rate is significantly enhanced by LCF-91 membranes, particularly when fuel (hydrogen) is present in the sweep gas.
- Increased feed-side water concentration and flow rate, as well as sweep-side hydrogen concentration, positively impact hydrogen production.
- Limiting steps for oxygen permeation vary: bulk diffusion and sweep-side reaction in air separation, feed-side reaction in water thermolysis with inert sweep, and both feed/sweep-side reactions with fuel sweep gas.
Conclusions:
- LCF-91 perovskite membranes effectively facilitate hydrogen production from water thermolysis.
- Optimizing sweep gas composition (e.g., adding hydrogen) is key to maximizing hydrogen production rates.
- Understanding the rate-limiting steps is crucial for designing efficient membrane reactors for hydrogen generation.
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