Abstract
Single-atom electrocatalysts (SAEs) can realize the target of low-cost by the maximum atomic efficiency. However, they usually suffer performance decay due to high energy states, especially in a harsh acidic water splitting environment. Here, we conceive and realize a double protecting strategy that ensures robust acidic water splitting on Ir SAEs by dispersing Ir atoms in/onto Fe nanoparticles and embedding IrFe nanoparticles into nitrogen-doped carbon nanotubes (Ir-SA@Fe@NCNT). When Ir-SA@Fe@NCNT acts as bifunctional electrocatalyst at ultralow Ir loading of 1.14 μg cm-2, the required overpotentials to deliver 10 mA cm-2 are 250 and 26 mV for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in 0.5 M H2SO4 electrolyte corresponding to 1370 and 61 fold better mass activities than benchmark IrO2 and Pt/C at overpotential of 270 mV, respectively, resulting in only 1.51 V to drive overall water splitting. Moreover, the remarkable stability is also observed compared to Pt/C-IrO2 system.
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