Preparation of an Fe2Ni MOF on nickel foam as an efficient and stable electrocatalyst for the oxygen evolution reaction.

Xintong Ling,Tasawar Hayat,Feng Du,Yan Shen,Zhigang Zou,Ahmed Alsaedi,Yintong Zhang,Yong Zhou,Tao Li

doi:10.1039/c9ra07499f

Xintong Ling, Tasawar Hayat + Show 7 more

Open Access

https://doi.org/10.1039/c9ra07499f

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Abstract

Metal–organic frameworks (MOFs) as versatile templates for preparing transition metal compounds has received wide attention. Benefiting from their diversified spatial structure and controllable chemical constituents, they have become a research hotspot in the field of electrocatalytic water splitting. Herein, Fe2Ni-MIL-88B MOF on nickel foam (Fe2Ni MOF/NF) has been prepared through a one-pot method growth process. Compared with Fe MOF/NF and Ni MOF/NF, the interaction between Fe3+ and Ni2+ in Fe2Ni MOF/NF accelerates the electron transfer through the oxygen of the ligand, leading to increased 3d orbital electron density of Ni, which enhances the activity of the oxygen evolution reaction (OER) in alkaline solution. Fe2Ni MOF/NF provides a current density of 10 mA cm−2 at a low overpotential of 222 mV, and its Tafel slope is also very small, reaching 42.39 mV dec−1. The success of the present Fe2Ni MOF/NF catalyst is attributed to the abundant active centers, the bimetallic clusters Fe2Ni-MIL-88B, the positive coupling effect between Ni and Fe metal ions in the MOF, and synergistic effect between the MOF and NF. Besides, Fe2Ni MOF/NF possesses excellent stability over 50 h of continuous operation, providing feasibility for commercial use.

Highlights

In the last few years, with the rapid development of industrial production and the increasing population, the demand for fossil energy has increased.[1]
The Fe2Ni Metal–organic frameworks (MOFs)/nickel foam (NF) was prepared by a one-pot method
Fe MOF/NF and Ni MOF/NF could be synthesized in the same way without adding NiCl2$6H2O or Fe(NO)3$9H2O, respectively

Summary

Introduction

In the last few years, with the rapid development of industrial production and the increasing population, the demand for fossil energy has increased.[1]. Due to involving multiple reaction steps from water to O2, the OER process has been considered as the bottleneck.[5] Some noble-metal-based materials, such as RuO2 and IrO2, have relatively high electrocatalytic activity for the OER. Their scarcity limits their largescale application.[6,7] The search for OER electrocatalysts with high efficiency and low cost of nonprecious metal materials has become an important task. Speci cally, compared with the monometallic MOF materials (Fe MOF/NF and Ni MOF/NF), Fe2Ni MOF/NF had better performance in OER It exhibited a low overpotential of 222 mV at a current density of 10 mA cmÀ2, and a small Tafel slope of 42.39 mV decÀ1. Probe UlVAC-PHI, Japan) was used to obtain the XPS data of the materials, with reference to C 1s (binding energy of 284.8 eV)

Electrochemical measurements

Results and discussion

Material characterization

Conclusions