3D Sulfur and nitrogen doped carbon materials Ni-MOF electrocatalysts for oxygen evolution reaction

Sulfur-nitrogen doped porous carbon (SNPC) material was first synthesized by the hydrothermal method and high-temperature carbonization. Then, the three-dimensional cube SNPC-Ni-metal organic frameworks (SNPC-Ni-MOF) composite was finally synthesized by hydrothermal method and applied in oxygen evol...

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Bibliographic Details
Published in:Ionics 2023-03, Vol.29 (3), p.1077-1087
Main Authors: Li, Qi, Tao, Yuwei, Luo, Shiping, Xie, Aijuan, Tu, Yin
Format: Article
Language:English
Subjects:
Carbon
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrocatalysts
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Energy Storage
High temperature
Metal-organic frameworks
Nitrogen
Optical and Electronic Materials
Original Paper
Oxygen evolution reactions
Porous materials
Renewable and Green Energy
Sulfur
Surface area
Trimesic acid
Water splitting
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Summary:Sulfur-nitrogen doped porous carbon (SNPC) material was first synthesized by the hydrothermal method and high-temperature carbonization. Then, the three-dimensional cube SNPC-Ni-metal organic frameworks (SNPC-Ni-MOF) composite was finally synthesized by hydrothermal method and applied in oxygen evolution reaction (OER). BET analysis proved the porosity and higher specific surface area of SNPC. FTIR analysis implied that the coordination of trimesic acid with metal ions was successful. SEM images showed that the as-synthesized carbon materials presented beautiful spherical. The overpotential of the as-synthesized composite was conducted by the LSV test, and it was found that the SNPC-Ni-MOF composite exhibited the lower overpotential (400 mV). Electrochemical impedance spectroscopy showed the SNPC-Ni-MOF had the smaller R ct value (1.744 Ω cm −2 ). Tafel plot indicated that the doping of sulfur and nitrogen improved the electrochemical properties of carbon materials to some extent. The cyclic voltammetry test illustrated that the electrochemical active surface area of SNPC-Ni-MOF was 48.75 cm 2 . The turnover frequency ​​for OER was 0.016 s −1 . In addition, the i-t curve test indicated that the SNPC-Ni-MOF composite possessed better stability, the retention rate reaches 96.7% after 20,000 cycles. All results illustrate that the OER performance of the as-prepared SNPC-Ni-MOF composite has been improved and can be used as electro-catalysts for water splitting. Graphical Abstract
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-022-04872-1