Enhancement of the hydrogen oxidation reaction in alkaline media via a bi-functional effect using tantalum as an oxophilic agent on NiMo/C

SH You, H Lee, E Ahn, KS Kim, BJ Lee, D Shin… - ACS …, 2023 - ACS Publications
ACS Catalysis, 2023ACS Publications
To avoid the increase of cost owing to the use of Pt group metal (PGM) catalysts, anion-
exchange membrane fuel cells (AEMFCs) operating in an alkaline electrolyte environment
where non-precious metals can be used are promising. However, the performance
limitations of PGM-free catalysts still need to be overcome. In this study, Ta-on-NiMo/C
fabricated by adding Ta on the surface of commercial NiMo/C via physical vapor deposition
was developed as an anodic catalyst for AEMFCs with advanced performance. The high …
To avoid the increase of cost owing to the use of Pt group metal (PGM) catalysts, anion-exchange membrane fuel cells (AEMFCs) operating in an alkaline electrolyte environment where non-precious metals can be used are promising. However, the performance limitations of PGM-free catalysts still need to be overcome. In this study, Ta-on-NiMo/C fabricated by adding Ta on the surface of commercial NiMo/C via physical vapor deposition was developed as an anodic catalyst for AEMFCs with advanced performance. The high oxophilicity of Ta ensures a continuous OH supply, and the bifunctional effect between Ta and Ni accelerates the hydrogen oxidation reaction (HOR). Therefore, Ta-on-NiMo/C exhibited 1.5 times more HOR activity than bare NiMo/C in rotating disk electrode experiments. Furthermore, the effect of Ta as the oxophilic agent was demonstrated by verifying the enhanced performance in a membrane electrode assembly in which Ta-on-NiMo/C was applied as an anodic catalyst.
ACS Publications
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