Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 14, Pages 6076-6079Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja211751k
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Funding
- Office of Basic Energy Sciences, Division of Materials Sciences, U.S. Department of Energy [DE-FG02-05ER46250]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1063059] Funding Source: National Science Foundation
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The widespread adoption and deployment of fuel cells as an alternative energy technology have been hampered by a number of formidable technical challenges, including the cost and long-term stability of electrocatalyst and membrane materials. We present a microfluidic fuel cell that overcomes many of these obstacles while achieving power densities in excess of 250 mW/cm(2). The poisoning and sluggish reaction rate associated with CO-contaminated H-2 and methanol, respectively, are averted by employing the promising, high-energy density fuel borohydride. The high-overpotential reaction of oxygen gas at the cathode is supplanted by the high-voltage reduction of cerium ammonium nitrate. Expensive, ineffective membrane materials are replaced with laminar flow and a nonselective, porous convection barrier to separate the fuel and oxidant streams. The result is a Nafion-free, room-temperature fuel cell that has the highest power density per unit mass of Pt catalyst employed for a non-H-2 fuel cell, and exceeds the power density of a typical H-2 fuel cell by 50%.
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