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Double-shell structured mixed-spinel oxides for highly efficient oxygen evolution
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DOI：10.1016/j.cej.2025.161462.png)
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Abstract
En 中文
Spinel oxides with both spinel and inverse spinel structures are considered highly promising electrocatalysts for the oxygen evolution reaction (OER). Simultaneously activating two types of spinel-structured composites is crucial to unlocking their catalytic potential, yet this remains challenging. Herein, we demonstrate a co-doping strategy to introduce both Ni and Fe elements into phosphorus-modified Co3O4 microsphere composites to optimize electron distribution and generate abundant oxygen defects. The resulting double-shell structure enables rapid mass transfer and enhanced electrolyte enrichment. As a result, the phosphorus-doped ternary Ni-FeCo oxide exhibits a low overpotential of 252 mV to achieve a current density of 10 mA cm(-2), outperforming commercial RuO2. This work provides an effective approach to enhancing the OER activity of spinel oxides by fabricating dual-type spinel complexes.
Keywords:
Spinel
Heterojunction
Double-shell structure
Oxygen evolution reaction
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