Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 7, Pages 3056-3064Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2007.11.044
Keywords
corrosion; PCB coating; DMFC; degradation
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Adopting printed circuit board (PCB) as the current collector for direct methanol fuel cell (DMFC) is a promising task. This paper found that the combinational 10 mu m Ni/2 mu m Au coatings on PCB could not endure halide attacking in its anodic polarization. With this coated PCB, the self-breathing DMFC stack with passive methanol supply exhibited progressively degradation in its lifetime test. By using a series of measurements, it is shown that initial corrosion would not obviously influence stack degradation, but the subsequently inter-facilitation, between F- originating from Nation membrane and corrosion products of Ni2+ and CU2+ from PCB, would result in serious degradation, the final stack invalidation would present accompanied with the loss of membrane conductivity. The defects on coated PCB are crucial to initiate localized corrosion and stack degradation. Although cyclic voltammetry (CV) technology is effective to recover cell temporarily, its damage by releasing F- should be further evaluated. (C) 2007 Elsevier Ltd. All rights reserved.
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