期刊
NANO LETTERS
卷 20, 期 3, 页码 2120-2128出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00127
关键词
Acidic water splitting; Iridium single atom; Oxygen evolution reaction; Hydrogen evolution reaction
类别
资金
- National Natural Science Foundation of China [21703212, 21875224]
- special funding for the development of science and technology of Shanghai Ocean University [A2-0203-00-100231]
- Shanghai Pujiang Program [18PJ1404200]
- Nature Science Foundation of Tianjin City, China [16JCQNJC03600]
Single-atom electrocatalysts (SAEs) can realize the target of low-cost by 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 a bifunctional electrocatalyst at ultralow Ir loading of 1.14 mu g 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 IrO, and Pt/C at an overpotential of 270 mV, respectively, resulting in only 1.51 V to drive overall water splitting. Moreover, remarkable stability is also observed compared to Pt/C-IrO2.
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