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Indexed by:期刊论文

Date of Publication:2009-09-05

Journal:JOURNAL OF POWER SOURCES

Included Journals:SCIE、EI、Scopus

Volume:193

Issue:2

Page Number:649-655

ISSN No.:0378-7753

Key Words:Direct methanol fuel cell; CO(2)-driven fuel feed; Long-term operation; Interconnection

Abstract:Direct methanol fuel cell (DMFC), with benefits such as high energy efficiency, quick start capability and instantaneous refueling, is a promising power source to meet the ever-increasing power demand for portable electronic products. In this paper, a novel CO(2)-driven fuel-feed device was produced and equipped in a passive 8-cell DMFC twin-stack for long-term operation. It was shown that this fuel-feed device was capable Of Supplying methanol solution continuously in response to the change in discharging current of the stack. Stainless steel sheet was photochemically etched as current collectors based on MEMS techniques. Series interconnections between two neighbor cells were realized in banded configuration which avoided the external connection. TiN-plated mesh was placed between current collector and membrane electrode assembly (MEA), which was used to lessen the internal resistance of the stack. A peak power density of 16.9 mW cm(-2) was achieved with 4 M methanol at ambient temperature and passive operation. The stack equipped with the fuel feed device successfully powered a sensor node for 39 h with the consumption of 80 ml of 4 M methanol. (C) 2009 Elsevier B.V. All rights reserved.