Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 297, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120451
Keywords
Dual active site tandem catalysis; Single-atom catalysis; Oxygen evaluation reaction; Catalytic synergism; Metal hydroxyl oxide
Funding
- National Key Research and Development Project from MOST [2019YFA0210300]
- National Natural Science Foundation of China [22005017, 21978022]
- Outstanding Talent Fund from BUCT
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The study successfully synthesized a highly efficient electrocatalyst Ni SAs/Fe-NiOOH containing dual active sites using the physically adsorbed metal ions method. The superior OER performance of Ni SAs/Fe-NiOOH is attributed to the synergism of NiC4 single atoms and Fe-NiOOH, offering a new concept of tandem catalysis for developing catalysts with multiple elementary steps.
The high voltage in oxygen evolution reaction (OER) often causes structural change in electrocatalysts and forms multiple active sites. Therefore, exploring the synergy of various active sites is extremely significant to develop catalysts for OER with multiple elementary steps. Herein, we adopt the physically adsorbed metal ions method to successfully synthesize a highly-efficient electrocatalyst containing the dual active sites of Fe-NiOOH and NiC4 single atoms (marked as Ni SAs/Fe-NiOOH). The Ni SAs/Fe-NiOOH displays outstanding OER performance with an overpotential of 269 mV to deliver current density of 10 mA/cm(2) that shows 55 mV superior to commercial IrO2/CB at the same condition. Experiments and density functional theory calculations indicate that the excellent OER activity of Ni SAs/Fe-NiOOH catalyst is attributed to the synergy of dual active sites of NiC4 SAs and Fe-NiOOH. A tandem catalysis mechanism is also proposed to reveal the synergism of two active centers, which makes the potential-determining step more facile and accordingly decreases the OER overpotential. This work offers a new concept of tandem catalysis to develop the electrocatalysts with many elemental steps, like OER and oxygen reduction reaction catalysts.
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