Abstract
Herein, we report electrochemically durable oxygen reduction reaction catalysts for proton exchange membrane fuel cells under conditions of hydrogen starvation. Insufficient hydrogen supply during transient conditions leads to a cell reversal state in a proton exchange membrane fuel cell, and oxidation of the carbon support severely decreases the cell performance. The use of carbon nanotubes as a support for the oxygen reduction reaction catalyst is found to suppress carbon oxidation due to the high crystallinity, low defect density, and high aspect ratio, which results in a consistent cell voltage, electrochemical surface area, and electrical resistance, even after 100 rounds of cell reversal. This study demonstrates the excellent durability of proton exchange membrane fuel cells with a Pt/Carbon nanotube electrode, as confirmed by X-ray diffraction, transmission electron microscopy, Raman spectroscopy and cyclic voltammetry analysis.
Published Version
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