Abstract
An IrO2-ZnO composite nanorod array with distinct morphological features was successfully fabricated through a facile method via a simple acid-base reaction, followed by a postcalcination process. A modulation in the annealing treatment time (t) generated the variation in morphology, at a constant temperature (600 °C), and the nanorod-like growth on the surfaces was revealed at t ≥ 3 h. Especially, the IrO2-ZnO composite nanorod array exhibited superior OER catalytic activities (e.g., a potential of 1.481 V at 10 mA cm-2(vs RHE) and a Tafel slope of 42.9 mV dec-1). Moreover, there was no apparent potential shift with robust long-term cycling stability under acidic conditions, which were much better than those of IrO2and commercial iridium (cIr) and comparable with those of the previously reported outstanding Ir-based OER catalysts. Considering that the nanorod array was fabricated with the loading of the Zn metal component, which showed generally low catalytic activity and poor durability, this study suggests a promising strategy with an extended synthetic methodology for preparing Zn-mixed metal oxides as highly efficient electrocatalysts.
Original language | English |
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Pages (from-to) | 3810-3820 |
Number of pages | 11 |
Journal | ACS Applied Energy Materials |
Volume | 5 |
Issue number | 3 |
DOIs | |
State | Published - 28 Mar 2022 |
Keywords
- electrocatalyst
- iridium oxide (IrO)
- nanorod array
- oxygen evolution reaction
- zinc oxide (ZnO)