Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 278, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119295
Keywords
Co-3(hexaiminotriphenylene)(2); Metal-organic framework; Oxygen evolution reaction; Conductivity; pi-d conjugation
Funding
- National Natural Science Foundation of China [U1832145, 51972195, 21832005, 21972078, 11374190, 51321091]
- Young Scholars Program of Shandong University [2016WLJH16, 2020QNQT012]
- Taishan Scholar Foundation of Shandong Province, China
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The application of metal-organic frameworks (MOFs) in electrocatalysis is mainly limited by their poor electrical conductivity. Herein, we report an intrinsically conductive pi-d conjugated two-dimensional (2D) MOF Co-3(HITP)(2) (HITP= 2,3,6,7,10,11-hexaiminotriphenylene), which possesses well-defined porous networks and much larger number of active sites for oxygen evolution, i.e. Co-N-4 sites (23.44 wt. % of Co element). Co-3(HITP)(2) exhibits high electrical conducting behavior (1150 S m(-1)), outperforming holey graphene (similar to 1000 S m(-1)). DFT theoretical calculation verifies the metallic behavior of Co-3(HITP)(2) and demonstrates that the pi-d conjugation contributes to the excellent conductivity. Additionally, Co-3(HITP)(2) displays prominent oxygen evolution reaction (OER) activity (an overpotential of 254 mV vs. RHE at a current density of 10 mA cm(-2) and a Tafel slope of 86.5 mV dec(-1)) in alkaline electrolyte, which is comparable or even superior to most cobalt-based materials reported thus far as well as commercial RuO2 and IrO2. These promising results suggest the great potential of pristine pi-d conjugated 2D MOFs as electrocatalysts.
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