Issue 16, 2023

Sulfur-doped NiFe(CN)5NO nanoparticles as efficient electrocatalysts for the oxygen evolution reaction

Abstract

Developing low-cost and high-efficiency electrocatalytic materials for the oxygen evolution reaction (OER) is crucial and urgent for water splitting. Here, we demonstrate a novel OER electrocatalyst (S–NiFe(CN)5NO) prepared by constructing a bimetallic metal–organic framework (MOF) and in situ doping of sulfur. The generation of Ni–Fe active sites upgrades the structural stability and electronic conductivity of the MOF. The sulfur doping further optimizes the electronic structure, thus lowering the energy barriers for the OER. As a result, the S–NiFe(CN)5NO catalyst possesses excellent catalytic activity towards the OER with an ultralow overpotential of 274 mV at 10 mA cm−2 and a small Tafel slope of 54.4 mV dec−1 in 1.0 M KOH. Moreover, the activity can be well maintained after 1000 cycles, indicating superior electrochemical stability. The electrocatalytic performance of S–NiFe(CN)5NO is far superior to that of pristine NiFe(CN)5NO and the advanced RuO2 catalyst. It is revealed that the improved OER catalytic properties are attributed to the synergetic effect of bimetallic active sites and sulfur species in S–NiFe(CN)5NO. Density functional theory calculations explain that S doping can accelerate electron transport and optimize OER paths. This work is meaningful for the study of many multivariate MOFs as OER catalysts and can be extended to other energy-related fields.

Graphical abstract: Sulfur-doped NiFe(CN)5NO nanoparticles as efficient electrocatalysts for the oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2023
Accepted
21 Mar 2023
First published
22 Mar 2023

J. Mater. Chem. A, 2023,11, 8904-8911

Sulfur-doped NiFe(CN)5NO nanoparticles as efficient electrocatalysts for the oxygen evolution reaction

Y. Zhang, X. Shen, C. Song, Z. Ji and F. Du, J. Mater. Chem. A, 2023, 11, 8904 DOI: 10.1039/D3TA00635B

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