Ozone Generating Electrolysis Cell

Abstract

The ozone generating electrolysis cell ( 10 ) according to the invention has a negative electrode ( 13 ) and an ozone generating positive electrode ( 16 ) comprising a mixture of lead dioxide and polytetrafluoroethylene (PTFE). A proton conducting solid electrolytic membrane ( 15 ) is arranged between the negative and positive electrodes ( 13, 16 ). The ozone generating electrolysis cell ( 10 ) also comprises an electrically conducting, liquid and gas permeable first electrode support ( 17 ) in contact with a side of the positive electrode ( 16 ) located opposite to the membrane ( 15 ), wherein said side of the electrode support ( 17 ) has a surface covered with a platinum-containing layer. The positive electrode ( 16 ) is made of a mixture prepared by the high-pressure compression of lead dioxide grains of colloid size and PTFE filaments having a dimension of at most 1 mm. Furthermore, the negative electrode ( 13 ) is adjoined to a side of the membrane ( 15 ) located opposite to the positive electrode ( 16 ) by a given compressing force and is formed on a surface of a porous second electrode support ( 12 ).

1 . An ozone generating electrolysis cell ( 10 ) comprising
 a negative electrode ( 13 );   an ozone generating positive electrode ( 16 ) comprising a mixture of lead(IV) oxide and polytetrafluoroethylene (PTFE);   a membrane ( 15 ) arranged between the negative and positive electrodes ( 13 ,  16 ); and   an electrically conducting, liquid and gas permeable first electrode support ( 17 ) in contact with a side of the positive electrode ( 16 ) located opposite to the membrane ( 15 ), said side of the electrode support ( 17 ) having a surface covered with a platinum-containing layer; characterized in that   said positive electrode ( 16 ) is made of a mixture prepared at ambient temperature by high-pressure molding of lead dioxide grains of colloid size and PTFE filaments having a dimension of at most 1 mm; and   said negative electrode ( 13 ) is adjoined to a side of the membrane ( 15 ) located opposite to the positive electrode ( 16 ) by a given compressing force and is formed on a surface of a porous second electrode support ( 12 ).   
   
   
       2 . The cell according to  claim 1 , characterized in that the PTFE filaments have a thickness of at most 100 μm within the mixture. 
   
   
       3 . The cell according to  claim 1 , characterized in that the positive electrode ( 16 ) contains PTFE in an amount of at least 10% by weight. 
   
   
       4 . (canceled) 
   
   
       5 . The cell according to  claim 1 , characterized in that the second electrode support ( 12 ) is a frit molded from grains of an electrically conductive material at ambient temperature and open air. 
   
   
       6 . The cell according to  claim 5 , characterized in that the second electrode support ( 12 ) have a grain size gradient in the direction of depth, wherein the grains of the smallest size are arranged at the negative electrode ( 13 ). 
   
   
       7 . The cell according to  claim 5 , characterized in that the electrically conductive material of the second electrode support ( 12 ) is titanium. 
   
   
       8 . The cell according to  claim 7 , characterized in that the negative electrode ( 13 ) comprises platinum black applied thereon in a suspension at ambient temperature and open air. 
   
   
       9 . The cell according to  claim 1 , characterized in that the membrane ( 15 ) is a solid electrolyte membrane with proton conductivity. 
   
   
       10 . The cell according to  claim 1 , characterized in that the positive electrode ( 16 ) and the first electrode support ( 17 ) form together a single integrated unit.