Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 28, Issue 60, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202201784
Keywords
electrocatalysis; ion doping; metal-organic frameworks; oxygen evolution reaction; overall water splitting
Categories
Funding
- National Natural Science Foundation of China [21965005]
- Natural Science Foundation of Guangxi Province [2018GXNSFAA294077, 2021GXNSFAA076001]
- Project of High-Level Talents of Guangxi [F-KA18015]
- Guangxi Technology Base and Talent Subject [GUIKE AD18126001, GUIKE AD20297039]
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Metal-organic frameworks have been investigated as potential oxygen evolution reaction (OER) electrocatalysts. In this study, a vanadium-doped nickel organic framework was fabricated, which showed enhanced OER activity and exhibited better performance than other catalysts in a water-splitting device.
Metal-organic frameworks (MOFs) have been considered as potential oxygen evolution reaction (OER) electrocatalysts owning to their ultra-thin structure, adjustable composition, high surface area, and high porosity. Here, we designed and fabricated a vanadium-doped nickel organic framework (V1-x-NixMOF) system by using a facile two-step solvothermal method on nickel foam (NF). The doping of vanadium remarkably elevates the OER activity of V1-x-NixMOF, thus demonstrating better performance than the corresponding single metallic Ni-MOF, NiV-MOF and RuO2 catalysts at high current density (>400 mA cm(-2)). V-0.09-Ni0.91MOF/NF provides a low overpotential of 235 mV and a small Tafel slope of 30.3 mV dec(-1) at a current density of 10 mA cm(-2). More importantly, a water-splitting device assembled with Pt/C/NF and V-0.09-Ni0.91MOF/NF as cathode and anode yielded a cell voltage of 1.96 V@1000 mA cm(-2), thereby outperforming the-state-of-the-art RuO2(+)||Pt/C(-). Our work sheds new insight on preparing stable, efficient OER electrocatalysts and a promising method for designing various MOF-based materials.
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