Fabrication of a Microtubular La0.6Sr0.4Ti0.2Fe0.8O3−δMembrane by Electrophoretic Deposition for Hydrogen Production

Kyoung-Jin Lee,Hae-Jin Hwang,Yeong-Ju Choe,Jun-Sung Lee

doi:10.1155/2015/505989

Kyoung-Jin Lee, Hae-Jin Hwang + Show 2 more

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https://doi.org/10.1155/2015/505989

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Abstract

Microtubular type La0.6Sr0.4Ti0.2Fe0.8O3−δ(LSTF) membranes were prepared by electrophoretic deposition (EPD). The oxygen permeation and hydrogen production behavior of the membranes were investigated under various conditions. LSTF green layer was successfully coated onto a carbon rod and, after heat treatment at 1400°C in air, a dense LSTF tubular membrane with a thickness of 250 mm can be obtained. The oxygen permeation and hydrogen production rate were enhanced by CH4in the permeate side, and the hydrogen production rate by water splitting was 0.22 mL/min·cm2at 1000°C. It is believed that hydrogen production via water splitting using these tubular LSTF membranes is possible.

Highlights

Hydrogen is considered to be a generation clean and efficient fuel that can be used in electrochemical devices, such as fuel cells or internal combustion engines, to power vehicles or generate electricity
Dense and crack-free microtubular type La0.6Sr0.4Ti0.2Fe0.8O3−δ (LSTF) membranes were successfully fabricated by electrophoretic deposition (EPD) and dipcoating
It was confirmed that hydrogen production via water splitting is possible using these LSTF microtubular membranes

Summary

Introduction

Hydrogen is considered to be a generation clean and efficient fuel that can be used in electrochemical devices, such as fuel cells or internal combustion engines, to power vehicles or generate electricity. Hydrogen is normally produced by methane steam reforming (CH4 + 2H2O = 3H2 + CO) or the electrolysis of water because pure hydrogen does not occur naturally on Earth in large quantities. The electrolysis of water requires large amounts of electricity to decompose water and produce hydrogen. Since the equilibrium constant of the water splitting reaction is very small, it generates very low concentrations of hydrogen and oxygen, even at high temperatures (0.1% hydrogen and 0.042% oxygen at 1600∘C). This limitation of water dissociation can be overcome by controlling the thermodynamic equilibrium. If the produced oxygen or hydrogen can be removed from the reactor, the equilibrium is shifted towards the dissociation of water, thereby increasing the hydrogen production rate up to a realistic level

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