Abstract
Development of efficient, stable and acid-resistant oxygen evolution and oxygen reduction catalysts is extremely desirable for regenerative fuel cells and rechargeable metal-air batteries. Herein, we adopt a simple impregnation and hydrogen reduction strategy to prepare an ultrafine iridium oxide supported on the multiwalled carbon nanotubes. The 2.0% IrO2@CNT catalyst shows good chemical water oxidation activity with turnover frequency of 3.48 s−1 and superior electrochemical oxygen evolution activity at 10 mA cm−2, with only 217 mV and 272 mV of overpotential in 1.0 M KOH and 0.5 M H2SO4, respectively. Besides, 2.0% IrO2@CNT exhibits good stability for OER in both alkaline and acidic electrolytes. In addition, 2.0% IrO2@CNT manifests excellent ORR performance, including a positive onset potential (∼0.91 V vs RHE), a high limiting current density (−4.6 mA cm−2), good stability, and strong tolerance to methanol crossover. The enhanced catalytic activity arises from the synergetic action between IrO2 and multiwalled carbon nanotubes.
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