Freestanding 2D NiFe Metal–Organic Framework Nanosheets: Facilitating Proton Transfer via Organic Ligands for Efficient Oxygen Evolution Reaction
Journal
Small
Journal Volume
18
Journal Issue
26
Date Issued
2022
Author(s)
Abstract
The oxygen evolution reaction (OER) is crucial to electrochemical hydrogen production. However, designing and fabricating efficient electrocatalysts still remains challenging. By confinedly coordinating organic ligands with metal species in layered double hydroxides (LDHs), an innovative LDHs-assisted approach is developed to facilely synthesize freestanding bimetallic 2D metal–organic framework nanosheets (2D MOF NSs), preserving the metallic components and activities in OER. Furthermore, the research has demonstrated that the incorporation of carboxyl organic ligands coordinated with metal atoms as proton transfer mediators endow 2D MOF NSs with efficient proton transfer during the electrochemical OHads → Oads transition. These freestanding NiFe-2D MOF NSs require a small overpotential of 260 mV for a current density of 10 mA cm–2. When this strategy is applied to LDH nanosheets grown on nickel foam, the overpotential can be reduced to 221 mV. This outstanding OER activity supports the capability of multimetallic organic frameworks for the rational design of water oxidation electrocatalysts. This strategy provides a universal path to the synthesis of 2D MOF NSs that can be used as electrocatalysts directly. © 2022 Wiley-VCH GmbH.
Subjects
bimetallic metal–organic framework (MOFs); NiFe layered double hydroxides (LDHs); oxygen evolution; two-dimensional materials
SDGs
Other Subjects
Binary alloys; Electrocatalysts; Electrolysis; Hydrogen production; Iron alloys; Ligands; Nanosheets; Oxygen; Proton transfer; 2D metal; Bimetallic metal–organic framework; Bimetallics; Electrochemicals; Layered-double hydroxides; Metalorganic frameworks (MOFs); Nife layered double hydroxide; Organic ligands; Oxygen evolution; Two-dimensional materials; Metals
Type
journal article