What question did this study set out to answer?

To examine dynamic redox transitions and structural integrity in Fe3O4@CoFe2O4 core-shell nanoparticles under alkaline oxygen evolution reaction conditions across a wide potential range.

December 15, 2022ACS Catalysis

Cooperative Redox Transitions Drive Electrocatalysis of the Oxygen Evolution Reaction on Cobalt–Iron Core–Shell Nanoparticles

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To examine dynamic redox transitions and structural integrity in Fe3O4@CoFe2O4 core-shell nanoparticles under alkaline oxygen evolution reaction conditions across a wide potential range.
Synthesized core-shell Fe3O4@CoFe2O4 oxide nanoparticles as electrocatalysts for the alkaline oxygen evolution reaction.
Tracked potential-dependent electronic and structural states using operando near-edge X-ray absorption fine structure (NEXAFS) spectroscopy in total electron yield mode.
Demonstrated that the Fe3O4 core strongly dictates the surface chemistry of the CoFe2O4 shell under oxidative catalytic conditions.
Preserved the particle spinel structure and Co(II) shell oxidation state up to 1.8 V vs RHE, while Fe(II) in the core underwent reversible oxidation to Fe(III).

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Implication

Operando spectroscopic study reveals cooperative redox coupling in cobalt-iron core-shell nanoparticles, indicating core-induced surface stability during the alkaline oxygen evolution reaction.

Cite This Study

Royer et al. (2022) studied this question.

synapsesocial.com/papers/6a98dcf94cb77c974d051bdf https://doi.org/10.1021/acscatal.2c04512

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Implication

Operando spectroscopic study reveals cooperative redox coupling in cobalt-iron core-shell nanoparticles, indicating core-induced surface stability during the alkaline oxygen evolution reaction.

Cooperative Redox Transitions Drive Electrocatalysis of the Oxygen Evolution Reaction on Cobalt–Iron Core–Shell Nanoparticles

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Discussion

Implication

Cite This Study

Cooperative Redox Transitions Drive Electrocatalysis of the Oxygen Evolution Reaction on Cobalt–Iron Core–Shell Nanoparticles

Key Points

Discussion

Implication

Cite This Study

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