ELECTROCHEMICAL SENSOR OF HYDROGEN AND HYDROGEN-CONTAINING REDUCING AGENTS

摘要

1533194 Hydrogen & hydrogen containing reducing agent sensor N S LIDORENKO G F MUCHNIK A G POLYAK V A VAKHONIN and V M KRYLOV 20 April 1977 16381/77 Heading G1N A sensor for hydrogen and hydrogen containing reducing agents in the presence of oxygen comprises a platinum group metal anode, an acidic polymeric electrolyte and a cathode comprising coal activated with an organic compound which selectively reduces oxygen electro-chemically. The organic compound may be a chloroquinone, a redox polymer or a monomeric or polymeric phthalocyanine of a transition metal. It is preferably present as a coating on the coal in a 1 : 1 weight ratio. The anode preferably comprises platinum black. As shown, the electrolyte is in the form of a membrane 2 and the anode 3 and cathode 4 are layers on opposite sides thereof. Porous graphite current collectors 5 contact the anode and cathode and are themselves contacted by hollow metal contacts 7, 8 through which the gases pass. In operation hydrogen is absorbed at the platinum anode and converted to H+, the electrons liberated, together with H+ ions reducing the organic compound. The compound is re-oxidized by the oxygen.