Multi-layer structure for electrode membrane-assembly and electrolysis process using same
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United States of America Patent
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May 23, 1989
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N/A
app pub date -
Nov 16, 1982
filing date -
Dec 30, 1981
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Abstract
A unitary membrane-electrode assembly includes a structure with multiple layers having different overvoltages for the desired electrochemical reaction. The layer attached to the membrane has a higher overvoltage for the electrochemical reaction than the electrode layer attached to its upper surface thereby preferentially locating the electrochemical reaction zone a small but controlled distance away from the membrane surface. In an alkali metal halide or alkali metal sulfate electrolysis process the use of a unitary dual layer structure with a bonded remote electrode is particularly useful as a cathode side structure because it eliminates formation of concentrated caustic at the membrane surface. As a result, back migration of OH.sup.- ions is reduced and cathodic current efficiency is increased.
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