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Enhancing Electrocatalytic Kinetics via Synergy of Co Nanoparticles and Co/Ni-N 4 -C- and N-Doped Porous Carbon.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 May 29; Vol. 16 (21), pp. 27224-27229. Date of Electronic Publication: 2024 May 15. - Publication Year :
- 2024
-
Abstract
- Transition-metal species embedded in carbon have sparked intense interest in the fields of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, improvement of the electrocatalytic kinetics remains a challenge caused by the synergistic assembly. Here, we propose a biochemical strategy to fabricate the Co nanoparticles (NPs) and Co/Ni-N <subscript>4</subscript> -C co-embedded N-doped porous carbon (CoNPs&Co/Ni-N <subscript>4</subscript> -C@NC) catalysts via constructing the zeolitic imidazolate framework (ZIF)@yeast precursor. The rich amino groups provide the possibility for the anchorage of Co <superscript>2+</superscript> /Ni <superscript>2+</superscript> ions as well as the construction of Co/Ni-ZIF@yeast through the yeast cell biomineralization effect. The functional design induces the formation of CoNPs and Co/Ni-N <subscript>4</subscript> -C sites in N-doped carbon as well as regulates the porosity for exposing such sites. Synergy of CoNPs, Co/Ni-N <subscript>4</subscript> -C, and porous N-doped carbon delivered excellent electrocatalytic kinetics (the ORR Tafel slope of 76.3 mV dec <superscript>-1</superscript> and the OER Tafel slope of 80.4 mV dec <superscript>-1</superscript> ) and a high voltage of 1.15 V at 10 mA cm <superscript>-2</superscript> for the discharge process in zinc air batteries. It provid e s an effective strategy to fabricate high-performance catalysts.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 16
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 38745464
- Full Text :
- https://doi.org/10.1021/acsami.4c00084