FeNiS2/reduced graphene oxide electrocatalysis with reconstruction to generate FeNi oxo/hydroxide as a highly-efficient water oxidation electrocatalyst

It is critical to developing electrocatalysts with highly active and cost-effective for oxygen evolution to resolve environmental pollution and energy issues, in which FeNi-based nanomaterials hold a great promise. Herein, (Fe 0.33 Ni 0.67 )S 2 and (Fe 0.33 Ni 0.67 )S 2 /reduced graphene oxide (rGO)...

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Bibliographic Details
Published in:Rare metals 2022-12, Vol.41 (12), p.4127-4137
Main Authors: Ren, Xiao-Zhen, Li, Xue-Hui, Peng, Yu-Jie, Wang, Guan-Zhi, Yin, Jie, Zhao, Xing-Chuan, Wang, Wei, Wang, Xiao-Bai
Format: Article
Language:English
Subjects:
Biomaterials
Catalysts
Chemistry and Materials Science
Electrocatalysts
Energy
Graphene
Heat treatment
Iron
Materials Engineering
Materials Science
Metallic Materials
Nanomaterials
Nanoscale Science and Technology
Nickel sulfide
Original Article
Oxidation
Oxygen evolution reactions
Physical Chemistry
Surface structure
Water splitting
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Summary:It is critical to developing electrocatalysts with highly active and cost-effective for oxygen evolution to resolve environmental pollution and energy issues, in which FeNi-based nanomaterials hold a great promise. Herein, (Fe 0.33 Ni 0.67 )S 2 and (Fe 0.33 Ni 0.67 )S 2 /reduced graphene oxide (rGO)- x % ( x  = 10, 20) composites, which exhibited highly efficient oxygen evolution reaction (OER) electrocatalytic activity under alkaline conditions, were synthesized via a hydrothermal approach and following thermal treatment with sulfur powders. Benefiting from the integrated structure of (Fe 0.33 Ni 0.67 )S 2 and support of conductive graphene backbones, (Fe 0.33 Ni 0.67 )S 2 /rGO-20% electrocatalyst showed the best OER activity with an overpotential of 172 mV at 10 mA·cm −2 and Tafel slopes of 45 mV·decade −1 . The composition, phase, and surface structure of the catalyst were characterized before and after OER reaction. The results indicated that crystal phase of the catalyst was reconstructed to the amorphous crystalline features after OER, with oxidation of iron-nickel sulfide and appearance of Ni–Fe oxo/hydroxide species, which may play a crucial role in the high OER performance as the catalytic-active. Moreover, in a two-electrode system towards overall water splitting with (Fe 0.33 Ni 0.67 )S 2 /rGO-20%/NF and Pt/C/NF as the anode and cathode, respectively, the catalysts exhibited excellent catalytic performance with the voltage of only 1.42 V at 10 mA·cm −2 . Graphical abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-022-02104-z