Joonwon Kim

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Chang‐Jin Kim

University of California, Los Angeles

De-Sheng Meng

University of California, Los Angeles

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University of California, Los Angeles

University of Washington

California NanoSystems Institute

Al-Farabi Kazakh National University

Sungkonghoe University

Seattle University

Samueli Institute

Soonchunhyang University

SUNY Downstate Health Sciences University

Bioengineering Center

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A Distributed Gas Breather for Micro Direct Methanol Fuel Cell (micrometer-DMFC)

De-Sheng Meng Joonwon Kim Chang‐Jin Kim

Abstract : This paper introduces a gas breather to remove the gas byproduct (CO2) from the micro direct methanol fuel cell (microDMFC). The concept and device configuration of distributed aim to improve the performance of the mDMFC by (1) decreasing flow resistance, (2) increasing the active electrode area, and (3) reducing or possibly eliminating the discrete gas separator. Experimental verification is provided by a prototype breather with microscale hydrophobic breathing holes, which successfully removed CO2 bubbles from a mixture of weak sulfuric acid and sodium bicarbonate aqueous solution. The techniques to fabricate sub-micron hydrophobic breathing holes with good stability, which would enable integration of the breather into the eventual mDMFC system, are discussed.

Microscale chemistry

Breather

Separator (oil production)

Sodium bicarbonate

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