| Abstrakt: |
Bimetallic IrxCo1−xalloy nanotubes (x= 0.25, 0.50 and 0.75, the atomic ratios of Ir precursor out of the total metal precursor) were prepared via the thermal H2‐reduction of IrxCo1−xOynanotubes which were synthesized by electrospinning and post calcination. Ir and Co atoms were well mixed to form the alloy in IrxCo1−xnanotubes. Their phase structures were different depending on the composition ratios. Ir0.75Co0.25and Ir0.50Co0.50had Ir fcc phase where some Ir atoms were substituted with Co. In contrast, Ir0.25Co0.75was in Ir‐substituting Co hcp phase. Among the IrxCo1−xalloy nanotubes, Ir0.50Co0.50showed the highest catalytic activity for overall electrochemical water splitting in acidic, neutral, and alkaline conditions, better than pure metallic Ir and Co counterparts. The activity and stability of Ir0.50Co0.50nanotubes for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) were superior to commercial Ir/C and Pt/C, respectively. Bimetallic alloy nanotubes of Ir and Co (IrxCo1−x) were prepared from the thermal H2‐reduction of the IrCo mixed oxide nanotubes (IrxCo1−xOy) that were synthesized via electrospinning and post calcination. The alloy nanotubes having a half of each element (denoted as Ir0.50Co0.50) presented excellent catalytic activity for pH‐universal electrochemical overall water splitting, better than commercial Pt/C and Ir/C. |
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