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

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 dopin...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-01, Vol.11 (16), p.8904-8911
Main Authors: Zhang, Yi, Shen, Xiaoping, Song, Chunsen, Ji, Zhenyuan, Fei-Hu, Du
Format: Article
Language:English
Subjects:
Bimetals
Catalysts
Catalytic activity
Density functional theory
Doping
Electrocatalysts
Electrochemistry
Electron transport
Electronic structure
Intermetallic compounds
Iron compounds
Metal-organic frameworks
Nanoparticles
Nickel compounds
Oxygen evolution reactions
Structural stability
Sulfur
Water splitting
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Summary: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.
ISSN:2050-7488
2050-7496
DOI:10.1039/d3ta00635b