Introduction
In a PEMFC, if pure hydrogen is used as the fuel, the anode reaction is then the hydrogen oxidation reaction (HOR) at the surface of the anode platinum electrocatalyst. The hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) are by far the most thoroughly investigated electrochemical reaction system [1]. Due to the fast electrode kinetics of hydrogen oxidation at platinum surface [1–3], the anode platinum loading can be reduced down to 0.05mgPt/cm2 without significant performance loss [4]. The cathode reaction in a PEM fuel cell is the oxygen reduction reaction (ORR) at platinum surface in an acidic electrolyte. In contrast to HER at the anode, the cathode ORR is a highly irreversible reaction even at temperatures above 100 °C at the best existing catalyst – the platinum surface [5]. Gasteiger et al. [6] found that 0.4mgPt/cm2was close to the optimal platinum loading for the air electrode using the state-of-the-art Pt/C catalyst and an optimized...
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Zhang, J., Zhu, F., Jiang, F. (2014). Elements of Electrocatalysts for Oxygen Reduction Reaction. In: Kreysa, G., Ota, Ki., Savinell, R.F. (eds) Encyclopedia of Applied Electrochemistry. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6996-5_483
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