Methyl phosphate formation as a major degradation mode of direct methanol fuel cells with phosphoric acid based electrolytes

被引：14

作者：

Aili, David ^{[1
]}

Vassiliev, Anton ^{[1
]}

Jensen, Jens Oluf ^{[1
]}

Schmidt, Thomas J. ^{[2
,3
]}

Li, Qingfeng ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Energy Convers & Storage, Sect Proton Conductors, DK-2800 Lyngby, Denmark

[2] Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland

[3] ETH, Dept Chem & Appl Biosci, Phys Chem Lab, CH-8093 Zurich, Switzerland

来源：

JOURNAL OF POWER SOURCES | 2015年 / 279卷

关键词：

Phosphoric acid; Methanol; Methyl phosphates; Proton conductivity; Fuel cell; Degradation; DOPED POLYBENZIMIDAZOLE; POLYMER ELECTROLYTE; PROTON CONDUCTIVITY; PBI MEMBRANES; WATER; NMR; PERFORMANCE; CONDUCTORS; MECHANISM; H-1;

D O I：

10.1016/j.jpowsour.2015.01.010

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：

Phosphoric acid and phosphoric acid doped polymer membranes are widely used as electrolytes in hydrogen based fuel cells operating at elevated temperatures. Such electrolytes have been explored for direct oxidation of methanol to further increase the versatility of the systems, however, with demonstrated lifetimes of only a few days to weeks. In this work the methyl phosphate formation from the acid and methanol is identified and proposed to be a major mechanism for the cell degradation. Proton conductivity and fuel cell durability tests validate the mechanism at high methanol contents. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：517 / 521

页数：5

共 28 条

[1] Thermal curing of PBI membranes for high temperature PEM fuel cells [J].