Journal
JOURNAL OF POWER SOURCES
Volume 461, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228147
Keywords
Mesoporous microstructure; Hydrogen oxidation reaction; Alkaline polymer electrolyte fuel cell; Electrochemistry
Funding
- National Key Research and Development Program of China [2018YFB1502300]
- National Natural Science Foundation of China [21905213, 21872108]
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Hydrogen oxidation reaction (HOR), as the anode reaction in alkaline polymer electrolyte fuel cells (APEFCs), is kinetically much more sluggish than that in the proton exchange membrane fuel cell (PEMFC). Therefore, developing efficient non-platinum or even non-noble metal HOR electro-catalysts is of great significance. Herein, the carbon support (Meso C) with mesoporous ravine-like channel and corresponding Ru-loaded catalyst (Ru/ Meso C) is deliberately designed to explore the effect of porous microstructure on the HOR electro-catalysis. Both the electrochemical and fuel cell tests manifests that the Ru/Meso C achieves a superior electro-catalytic performance toward the HOR with a peak power density of 1.02 W cm(-2). The Cu-UPD and CO-stripping methods are creatively coupled to probe the underlying mechanism of Ru/Meso C. It is proposed that the holey microstructure is relatively hydrophobic to favor H-2 access, and the mesoporous channel can provide a confined environment to protect the Ru NPs from oxidation, both facilitating the adsorption and dissociation of H-2 and synergistically boosting the HOR. Therefore, to engineer porous microstructure is proved to be a feasible pathway to design efficient HOR electro-catalysts. Meanwhile, the electrochemical techniques (Cu-UPD & CO-stripping) may act as a potential tool to probe the hydrophilic-hydrophobic properties.
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