The electron transfer between electrodes and the redox‐active prosthetic groups of oxidoreductases is usually too slow to be measurable, unless a mediator is used. Now, a mediator and the enzyme have been covalently immobilized on a functionalized carbon electrode. The electrons can thus flow from the cathode to the oxidoreductase via a “molecular wire”. The use of carbon felt having a larger inner surface area as electrode affords current densities at the lower end of the range used in industrial processes.
Abstract The results presented show the feasibility of a high power density lead acid cell with tubular negatives and positives, operating at 70 °C. Although lead negatives are supposed to deteriorate fast at temperatures above 50 °C, tubular negatives at 70 °C exceed the cycle life of pasted negatives operating at conventional conditions. The high rate discharge capacity of negatives and positives is increasing considerably with temperature. It is concluded that the “temperature gain” of the negative electrode is due to increased mobility of soluble Pb2+ species through the passivating PbSO4 layer and to improved diffusion of H2SO4 in the pore structure.
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