ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract The catalytic effects if iron phthalocyanine (FePc) on two types (A and B) of practical air electrodes were examined, and compared with those of cobalt phthalocyanine (CoPc). For Type A electrodes, polytetrafluoroethylene (PTFE) powder was heat-treated at 400° C. For Type B electrodes, PTFE dispersions were used with treatment at 250° C. Both FePc and CoPc showed high H2O2 decomposition rates, which resulted in low oxygen electrode polarization at high current density. However, the catalytic effects for Type A electrodes were not shown at low current density (〈 1 mA cm−2), despite the fact that a 4-electron reduction process took place on FePc at these current densities. For the Type B electrodes, the effect of FePc at low current density became clearer: under these conditions, the electrode with FePc showed a higher potential than that with CoPc and showed a higher open circuit potential (OCV) (0.218V). Type B electrodes showed good performance in the entire current density region compared with Type A electrodes. With FePc catalysts, Type B electrodes showed a larger current region for the 4-electron process (0-0.1 mA cm−2) compared with Type A electrodes (0-0.02 mA cm−2). The improved performance of Type B electrode is considered to be due to the presence of many pores as a result of the PTFE ‘yarn’ connecting carbon substrate particles.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00617743
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