Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 24, Pages 28242-28251Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c05944
Keywords
metal-organic framework; 1D nanorods; oxygen evolution reaction; orientation; solvent compositions
Funding
- National Natural Science Foundation of China [21808029]
- Fundamental Research Funds for Central Universities [DUT19LK22]
- State Key Laboratory of Fine Chemicals [KF1818]
- Liaoning Revitalization Talents Program [XLYC1907036]
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By developing orientation-adjustable metal-organic framework (MOF) nanorods on a nickel foam template, researchers successfully adjusted their orientation and achieved superior activity for the oxygen evolution reaction (OER), providing a potential route for efficient water electrolysis technology in the future.
A series of orientation-adjustable metal-organic framework (MOF) nanorods, CoFe(dobpdc)-I to CoFe(dobpdc)-III (dobpdc = 4,4'-dihydroxybiphenyl-3,3'-dicarboxylate), is developed on a 3D nickel foam (NF) template. By modulating the solvent composition for synthesis, the feature of MOF nanorods on the template can be varied from disorganized to a unidirectional orientation perpendicular to the NF. Well-aligned, vertically oriented CoFe(dobpdc)-III nanorods are hydrophilic and have more exposed active sites and interfacial charge transfer ability. Consequently, they exhibit a superior activity for oxygen evolution reaction (OER) with ultralow overpotentials of 176 and 240 mV at 10 and 300 mA cm(-2) in 1.0 M KOH (aq), respectively. CoFe(dobpdc)-III also shows a record low overpotential of 204 mV at J(10) mA cm(-2) among the electrocatalysts based on CoFe MOF and an excellent overpotential at a high current density (100 mA cm(-2)) of 312 mV in 0.1 M KOH (aq). This is the first report of a convenient method to straighten up MOF nanorods on a template for highly efficient OER.
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