Prussian-blue-analogue derived FeNi2S4/NiS nanoframes supported by N-doped graphene for highly efficient methanol oxidation electrocatalysis

• Published in: Journal of colloid and interface science 2023-10, Vol.647, p.246-254
• Main Authors: Zhang, Kefu, Deng, Yongqi, Wu, Yihan, Wang, Lele, Yan, Lifeng
• Format: Article
• Language: English
• Subjects: Catalyst; catalysts; catalytic activity; FeNi2S4/NiS; fuel cells; Graphene; methanol; Methanol oxidation; Nanoframes; oxidation; PBA; sulfides
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2023.05.150

[Display omitted] The design of effective and robust non-noble metal electrocatalysts to enhance catalytic reaction kinetic is critical to promote methanol oxidation catalysis. Herein, hierarchical Prussian blue analogue (PBA)-derived sulfide heterostructures supported by N-doped graphene (FeNi2S4/NiS-NG) as efficient catalysts have been developed for methanol oxidation reaction (MOR). Benefiting from the merits of hollow nanoframes structure and heterogeneous sulfide synergy, FeNi2S4/NiS-NG composite not only possesses abundant active sites to boost the catalytic properties but also alleviates the CO poisoning effect during the process exhibiting favorable kinetic behavior toward MOR. Specifically, the remarkable catalytic activity (97.6 mA cm−2/1544.3 mA mg−1) of FeNi2S4/NiS-NG for methanol oxidation was achieved, superior to most reported non-noble electrocatalysts. Additionally, the catalyst showed competitive electrocatalytic stability, with a current density of over 90% after 2000 consecutive CV cycles. This study offers promising insights into the rational modulation of the morphology and components of precious-metal-free catalysts for fuel cell applications.