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Surface engineering of 2D MOF to construct high-density Co9S8 nanoparticles supported on nitrogen doped carbon for efficient oxygen evolution reaction.
- Source :
-
International Journal of Hydrogen Energy . Jul2023, Vol. 48 Issue 61, p23402-23411. 10p. - Publication Year :
- 2023
-
Abstract
- Transition metal sulfides and their hybrids are promising alternative to precious metal catalyst for the oxygen evolution reaction (OER). Herein, the high-density Co 9 S 8 nanoparticles (NPs) embedded in N-doped carbon has been prepared by using surface-engineered zeolitic imidazolate framework-9 (ZIF-9) nanosheets as precursor. The surface of ZIF-9 was modified with TAA, which is able to create chemical barrier and prevents metal from aggregation in the subsequent pyrolysis, thus making small Co 9 S 8 NPs densely anchored on carbon layers. Arising from the unique structure, Co 9 S 8 @NC affords an optimized electronic structure and rich effective reactive sites for OER. As expected, Co 9 S 8 @NC exhibits small overpotential of 264 mV at 10 mA cm−2, low Tafel slope of 68.4 mV dec−1, and superior stability for alkaline OER (0.1 M KOH). The electrolysis cell, which was equipped with Co 9 S 8 @NC cathode and Pt/C anode, shows low water splitting voltage of 1.58 V at 10 mA cm−2 in 1.0 M KOH. This work employs an efficacious surface engineering strategy to design metal sulfide-based electrocatalysts for enhancing OER performance. Co 9 S 8 @NC was synthesized through carbonization of surface-engineered 2D MOF. Co 9 S 8 @NC exhibits high OER activity with low overpotential of 264 mV in 0.1 M KOH due to the high-density reactive sites. [Display omitted] • Co 9 S 8 @NC was obtained through carbonization of surface-engineered ZIF-9. • High-density Co 9 S 8 nanoparticles are supported on N-doped carbon. • Co 9 S 8 @NC exhibits excellent performance for OER. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 48
- Issue :
- 61
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 164639125
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2023.03.090