Electrochemical cell for the detection of noxious gases
First Claim
1. An electrochemical cell for quantitatively detecting ethylene oxide comprising:
- (a) a first working electrode comprising a gas diffusion membrane having bonded thereto a catalytic portion electrochemically reactive with ethylene oxide;
(b) a second working electrode having electrochemical activity with oxidation/reduction products produced at the first working electrode;
(c) a counter electrode;
(d) a reference electrode;
(e) an electrolyte in contact with the catalytic portion of the first working electrode and in contact with the second working, counter and reference electrodes;
(f) means for containing said electrolyte and said first and second working electrodes, said counter electrode and said reference electrode;
(g) means for maintaining a fixed potential on said first working electrode relative to said reference electrode of from above 1.0 to about 1.8 volts with respect to the potential of the reversible hydrogen couple in the electrolyte of the cell; and
(h) means for maintaining a fixed potential on said second working electrode relative to said reference electrode of from about 1.0 to 2.2 volts with respect to the potential of the reversible hydrogen couple in the electrolyte of the cell, the fixed potential on said second working electrode being maintained at a voltage higher than the fixed potential being maintained on said first working electrode.
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Accused Products
Abstract
The present invention is for an electrochemical cell and method for quantitatively detecting noxious gas which comprises a first working electrode comprising a gas diffusion membrane having bonded thereto a catalytic portion electrochemically reactive with the noxious gas; a second working electrode having electrochemical activity with the oxidation/reduction products produced at the first working electrode; a counter electrode; a reference electrode; an electrolyte; means for containing said electrolyte and said electrodes; means for maintaining a fixed potential on said first working electrode relative to said reference electrode of from about 1.0 to 1.8 volts with respect to the potential of the reversible hydrogen couple of the electrolyte of the cell; and means for maintaining a fixed potential on said second working electrode relative to said reference electrode of from about 1.0 to 2.2 volts with respect to the potential of the reversible hydrogen couple of the electrolyte of the cell, the fixed potential on said working electrode being maintained at a voltage higher than the fixed potential being maintained on said first working electrode.
21 Citations
19 Claims
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1. An electrochemical cell for quantitatively detecting ethylene oxide comprising:
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(a) a first working electrode comprising a gas diffusion membrane having bonded thereto a catalytic portion electrochemically reactive with ethylene oxide; (b) a second working electrode having electrochemical activity with oxidation/reduction products produced at the first working electrode; (c) a counter electrode; (d) a reference electrode; (e) an electrolyte in contact with the catalytic portion of the first working electrode and in contact with the second working, counter and reference electrodes; (f) means for containing said electrolyte and said first and second working electrodes, said counter electrode and said reference electrode; (g) means for maintaining a fixed potential on said first working electrode relative to said reference electrode of from above 1.0 to about 1.8 volts with respect to the potential of the reversible hydrogen couple in the electrolyte of the cell; and (h) means for maintaining a fixed potential on said second working electrode relative to said reference electrode of from about 1.0 to 2.2 volts with respect to the potential of the reversible hydrogen couple in the electrolyte of the cell, the fixed potential on said second working electrode being maintained at a voltage higher than the fixed potential being maintained on said first working electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An electrochemical cell for quantitatively detecting ethylene oxide comprising:
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(a) a first working electrode comprising a gas diffusion membrane having bonded thereto a catalytic portion electrochemically reactive with ethylene oxide; (b) a second working electrode having electrochemical activity with oxidation/reduction products produced at the first working electrode; (c) a counter electrode; (d) a reference electrode; (e) an electrolyte in contact with the catalytic portion of the first working electrode and in contact with the second working, counter and reference electrodes; (f) means for containing said electrolyte and said first and second working electrodes, said counter electrode and said reference electrode; (g) means for maintaining a fixed potential on said first working electrode relative to said reference electrode of from about 1.0 to 1.8 volts with respect to the potential of the reversible hydrogen couple in the electrolyte of the cell; and (h) means for maintaining a fixed current through said second working electrode of from about 1 mA to 30 mA.
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Specification