MORPHOLOGICAL-CHARACTERISTICS OF PTFE BONDED GAS-DIFFUSION ELECTRODES

被引：32

作者：

GIORDANO, N ^{[1
]}

PASSALACQUA, E ^{[1
]}

ALDERUCCI, V ^{[1
]}

STAITI, P ^{[1
]}

PINO, L ^{[1
]}

MIRZAIAN, H ^{[1
]}

TAYLOR, EJ ^{[1
]}

WILEMSKI, G ^{[1
]}

机构：

[1] INST CNR TAE, I-98126 MESSINA, ITALY

来源：

ELECTROCHIMICA ACTA | 1991年 / 36卷 / 5-6期

关键词：

PT UTILIZATION; ELECTRODE MICROSTRUCTURE; POROSIMETRY; CYCLIC VOLTAMMETRY; PHOSPHORIC ACID;

D O I：

10.1016/0013-4686(91)85314-W

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We have investigated the morphological and absorptive characteristics of the electrocatalyst layer of PTFE bonded gas diffusion electrodes. The electrocatalyst layer microstructure was varied by using different preparative conditions (320-360-degrees-C sintering temperature and 20-60% PTFE content). We measured the pore size distribution and the electrolyte uptake for each electrode. From these data we calculated porosities and electrolyte volume fractions of the electrocatalyst layer and agglomerate regions. The electrocatalyst layer porosity and electrolyte volume fraction depend directly on the preparative conditions, while the agglomerate porosity and the macropore porosity are not influenced significantly. We proposed and evaluated a theoretical expression for the Pt utilization in the electrocatalyst layer using our measured porosities and electrolyte volume fractions. These results agree well with electrochemical measurements of active Pt surface area using cyclic voltammetry. The percentage acid occupation (PAO) was also found to be a good property for correlating morphological-absorptive characteristics and Pt utilization.

引用

页码：1049 / 1055

页数：7

共 28 条

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