Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 660, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.130799
Keywords
Salphen organic frameworks; Hexaazatrinaphthylene; Dual -metal sites; Ladder; Conjugation; Electrochemical oxygen evolution
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The synthesis of hexaazatrinaphthylene-based salphen organic framework (HATN-SOF) with two different coordination sites for the dispersion of nickel/iron ions is reported. The bimetallic NiFeHATN-SOF exhibited high electrochemical oxygen evolution activity with a low overpotential and significantly higher mass activity and turnover frequency value compared to monometallic HATN-SOFs and benchmark RuO2. The research provides a new platform for rational design of bio-inspired heterobinuclear electrocatalysts.
The 2D conductive porous organic frameworks (POFs) with single metal sites are expected to be ideal electrocatalysts. However, developing POFs with multi-metal sites to boost their activities remains a formidable challenge. Herein, we report the synthesis of hexaazatrinaphthylene-based salphen organic framework (HATN-SOF) with two different coordination sites for atomically dispersion of nickel/iron ions. Due to the high loading active metal sites, the synergy between Ni/Fe ions, and the high bulk conductivity of 0.144 S/m, the bimetallic NiFeHATN-SOF showed high electrochemical oxygen evolution activity with a low overpotential of 259 mV at 10 mA cm 2. The mass activity and turnover frequency value reach 1304 mA/mg and 0.193 s 1 respectively at an overpotential of 300 mV, which are more than 20-times larger than those of the monometallic HATN-SOFs and of the benchmark RuO2. The research offers a new platform for rational design of bio-inspired heterobinuclear electrocatalysts with customized microenvironments for oxygen electrocatalysis.
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