PHOTOSYNTHETIC MEMBRANES .22. ENERGY-CONVERSION EFFICIENCY OF PHOTOELECTROCHEMICAL CELLS EMPLOYING A TITANIUM-DIOXIDE FILM ANODIC MEMBRANE AND A HYDROGEN OR OXYGEN CATHODE

被引:3
作者
BELLOBONO, IR
BONARDI, M
CASTELLANO, L
SELLI, E
RIGHETTO, L
机构
[1] UNIV MILAN,DEPT PHYS SCI,I-20133 MILAN,ITALY
[2] UNIV MILAN,INST GEN & APPL PHYS,I-20133 MILAN,ITALY
关键词
D O I
10.1016/1010-6030(92)85219-K
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Energy conversion efficiencies at various wavelengths in the range 315-420 nm were evaluated at 25 +/- 2 degrees-C in two types of photoelectrochemical cell, both involving a titanium dioxide film anodic membrane and 1 N NaOH as anolyte. In the first type, platinum black in 1 N H2SO4 was the counterelectrode (photoassisted energy conversion), whereas in the second type a platinum black cathode in 1 N NaOH worked self-regeneratively. The short-circuit current densities and open-circuit voltages were measured. Quantum efficiencies were also obtained. A comparison of the experimental values obtained in this study with those of conventional cells (titanium dioxide electrode not immobilized in a composite membrane structure) shows that no substantial difference is observed (outside experimental uncertainty) in the quantum and energy conversion efficiencies and open-circuit voltages. However, short-circuit current densities are systematically 13%-26% lower. This small effect can be attributed to a moderate increase in resistance brought about by the polymeric membrane. The performance and feasibility of photoelectrochemical membrane cells are discussed.
引用
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页码:253 / 258
页数:6
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