Issue 43, 2021
From the journal:

Journal of Materials Chemistry A

In situ etch engineering of Ru doped NiFe(OH)x/NiFe-MOF nanocomposites for boosting the oxygen evolution reaction†

Dongmei Liu,a   Hui Xu,c   Cheng Wang,a   Changqing Ye,*b   Rui Yua  and  Yukou Du ORCID logo *a  

* Corresponding authors

a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
E-mail: duyk@suda.edu.cn

b Jiangsu Key Laboratory for Environmental Functional Materials, Institute of Chemistry, Biology and Materials Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China
E-mail: yechangqing@mail.usts.edu.cn

c Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Oil and Gas Storage & Transportation Technology, Changzhou University, Jiangsu, China

Abstract

Metal–organic frameworks (MOFs) have been deemed as promising electrocatalysts for electrochemical water oxidation; however, the poor electronic conductivity and stability are still intractable issues hindering their practical applications. Herein, an efficient in situ etching strategy is employed to transform part of the pristine NiFe-MOF into active NiFe(OH)x and simultaneously induce the exposure of abundant defective areas, which not only facilitates the electron transfer efficiency for the oxygen evolution reaction (OER), but also enables the accessibility to further anchor Ru. Benefiting from the synergistic contributions of Ru, NiFe(OH)x and NiFe-MOF, the as-fabricated Ru/NiFe(OH)x/NiFe-MOF nanocomposite exhibits an enhanced OER activity with a low overpotential of 242 mV at a current density of 10 mA cm−2, and a two-electrode Ru/NiFe(OH)x/NiFe-MOF‖Pt/C electrolyzer also requires a considerably low voltage of 1.54 V at 10 mA cm−2 for overall water splitting. Moreover, taking both experimental and mechanistic results into account, the introduction of a small amount of Ru is able to induce a stronger adsorption between electrochemically active sites and oxygen-related intermediates, thus facilitating the OER activity.

Graphical abstract: In situ etch engineering of Ru doped NiFe(OH)x/NiFe-MOF nanocomposites for boosting the oxygen evolution reaction

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Article information

DOI
https://doi.org/10.1039/D1TA06438J
Article type
Paper
Submitted
30 Jul 2021
Accepted
11 Oct 2021
First published
15 Oct 2021

J. Mater. Chem. A, 2021,9, 24670-24676

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In situ etch engineering of Ru doped NiFe(OH)x/NiFe-MOF nanocomposites for boosting the oxygen evolution reaction

D. Liu, H. Xu, C. Wang, C. Ye, R. Yu and Y. Du, J. Mater. Chem. A, 2021, 9, 24670 DOI: 10.1039/D1TA06438J

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