Iron carbonate hydroxide templated binary metal–organic frameworks for highly efficient electrochemical water oxidation. Issue 98 (22nd November 2019)

• Record Type: Journal Article
• Authors: Du, Jian; Xu, Suxian; Sun, Licheng; Li, Fei
• Is Part Of: Chemical communications. Volume 55:Issue 98(2019)
• Page Start: 14773
• Page End: 14776
• Publication Date: 2019-11-22
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c9cc07433c
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : Iron carbonate hydroxide templated NiFe-MOF nanoplates exhibit high activity and stability for electrocatalytic water oxidation in alkaline solution. Abstract : Metal–organic frameworks (MOFs) are promising catalysts for electrochemical reactions. Herein, self-supported NiFe-MOF nanoplates grown on Ni foam (NF) were prepared with iron carbonate hydroxide nanosheets (FeCH NSs) as a semisacrificial template and evaluated for the electrocatalytic oxygen evolution reaction (OER). In this approach, the porous FeCH NSs not only serve as the iron source of NiFe-MOF, but also slow down the leaching of Ni ions from the substrate, thus playing a unique role in regulating the morphology of NiFe-MOF with reduced thickness and sizes, enabling rapid electron transfer and mass transport. The resultant NiFe-MOF/FeCH-NF electrode showed higher activity than FeCH template-free electrodes and superior OER performance over other MOF based binder-free OER electrodes. A current density of 10 mA cm −2 was obtained at a low overpotential of 200 mV with excellent durability in alkaline solution. Raman and TEM measurements reveal the partial transformation of NiFe-MOF to hydroxide during water oxidation.