期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 118, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2020.106786
关键词
Direct isopropanol fuel cells; LOHC; Organic fuel cells; Backpressure; Temperature
Liquid Organic Hydrogen Carrier (LOHC) systems offer a very interesting option for hydrogen storage in the existing infrastructure for common fuels. Technically most attractive is the direct use of LOHC-bound hydrogen in a low-temperature PEM fuel cell. Here, the isopropanol/acetone LOHC system is suggested to produce electricity from a condensable liquid without CO2 emissions. A high-performance direct isopropanol fuel cell using a vaporizer and a commercial fuel cell test system is demonstrated. For the first time backpressure is used to enhance the performance. The self-fabricated GDEs combined with a Nafion composite membrane achieved a power density of 203 mW cm(-2) for Isopropanol/Air operation at 300 kPa absolute and 85 degrees C. By increasing the operation temperature to 100 degrees C a peak power density of 254 mW cm(-2) is achieved, exceeding the highest reported values for isopropanol fuel cells operated with air by over 80%. The observed increase in performance can be attributed to the higher reaction rate of the electrooxidation of isopropanol at the anode side during pressurized conditions and to the reduced acetone-poisoning of the Pt-Ru catalyst at elevated temperatures.
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