Packed-bed wall-jet electrodes

A further development of the wall-jet system is to insert a packed-bed electrode upstream of the jet to make a packed-bed wall-jet electrode (PBWJE) [5-7]. The packed bed can be used to generate reactant, to generate a fresh electrode surface or, if the bed has immobilised enzyme, to carry out an enzymatic reaction. The packed-bed wall-jet electrode is illustrated in Fig. 3. 

An example of the use of this electrode is our work on developing an amperometric sensor for N03". Pletcher and Poorabedi showed that N03 can be reduced to NH3 on a copper electrode [26]. Unfortunately, the electrode tends to poison with time and this makes the sensor unreliable. This problem can be overcome by using a packed-bed electrode of copper to generate a fresh copper wall-jet electrode. The following cycle is used. 

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