Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 15, Pages 12729-12736Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5027192
Keywords
oxygen evolution; water oxidation; acidic media; selective leaching; Ir-enriched
Funding
- Ministry of Science and Technology of China [2012CB932800, 2013AA110201]
- National Natural Science Foundation of China [21073137]
- Hubei Key Laboratory of Fuel Cell (Wuhan University of Technology)
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The large-scale application of acidic water electrolysis as a viable energy storage technology has been hindered by the high demand of precious metal oxides at anode to catalyze the oxygen evolution reaction (OER). We report an Ir-Co binary oxide electrocatalyst for OER fabricated by a multistep process of selective leaching of Co from Co-rich composite oxides prepared through thermal decomposition. The stepwise leaching of the Co component from the composites leads to the formation of macro- and mesoscale voids walled by a cross-linked nanoporous network of rod- and wedge-like building units of Ir-Co binary oxide with a futile phase structure and an Ir-enriched surface. In comparison, Ir-Co binary oxide with similar composition prepared by direct thermal decomposition method exhibits a loose nanoparticle aggregation morphology with a Co-enriched surface. The cross-linked porous Ir-Co binary oxide from selective leaching is about 3-fold more active for the OER than that from direct thermal decomposition. Compared with pure IrO2 from thermal decomposition, the Co-leached binary oxide is ca. two times more active and is much more durable during continuous oxygen evolution under a constant potential of 1.6 V, thus showing a possibility of reducing the demand of the expensive and scarce Ir in OER electrocatalyst for acidic water splitting.
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