What question did this study set out to answer?

To synthesize carbon-supported IrNi core–shell nanoparticles and evaluate their structural characteristics, electrochemical stability, and catalytic performance for hydrogen oxidation.

May 3, 2011The Journal of Physical Chemistry C

Carbon-Supported IrNi Core–Shell Nanoparticles: Synthesis, Characterization, and Catalytic Activity

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Authors

KSKotaro SasakiBrookhaven National Laboratory KKKurian A. KuttiyielBrookhaven National Laboratory LBLaura BarrioInstitut Pasteur

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Implication

Experimental study demonstrates enhanced hydrogen oxidation activity in carbon-supported IrNi core-shell nanoparticles, indicating strong potential for fuel cell anodes.

Key Points

To synthesize carbon-supported IrNi core–shell nanoparticles and evaluate their structural characteristics, electrochemical stability, and catalytic performance for hydrogen oxidation.
Synthesized carbon-supported IrNi nanoparticles through chemical reduction followed by thermal annealing under hydrogen gas.
Tracked thermal segregation and shell formation using time-resolved synchrotron X-ray diffraction with Rietveld refinement and EXAFS spectroscopy.
Evaluated core protection and hydrogen oxidation reaction activity in an acidic electrolyte via in situ X-ray absorption spectroscopy.
Structural analysis confirmed nanoparticles composed of an IrNi solid solution alloy core covered by a two-layer metallic Ir shell.
In situ XAS verified that the Ir shell completely prevented Ni dissolution and oxidation under elevated potentials in acidic conditions.
The catalyst demonstrated higher hydrogen oxidation activity than commercial Pt/C catalysts due to Ni-induced Ir lattice contraction that suppresses IrOH formation.

Cite This Study

Sasaki et al. (2011) studied this question.

synapsesocial.com/papers/6a817acb61368bff2d691b4d https://doi.org/10.1021/jp200746j

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Implication

Experimental study demonstrates enhanced hydrogen oxidation activity in carbon-supported IrNi core-shell nanoparticles, indicating strong potential for fuel cell anodes.

Carbon-Supported IrNi Core–Shell Nanoparticles: Synthesis, Characterization, and Catalytic Activity

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Implication

Key Points

Cite This Study

Carbon-Supported IrNi Core–Shell Nanoparticles: Synthesis, Characterization, and Catalytic Activity

Discussion

Member takes

Implication

Key Points

Cite This Study

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