Tuning Microstructures of Iron-Nickel Alloy Catalysts for Efficient Oxygen Evolution Reaction †

doi:10.7503/cjcu20190660

Abstract

Abstract:

N-doped carbon(NC) coated iron-nickel alloy catalysts loaded on the carbon fiber papers(CFP) were prepared by firstly hydrothermal depositing iron-nickel based hydroxide/carbonates, then coating dopamine on their surface, and finally annealing the materials. Particularly, the active alloy species can be tuned to be Fe_0.64Ni_0.36 and FeNi₃ and the microscopic structures of the catalysts show to be nanotubes, nanoflowers and nanosheets upon different atomic ratio of Fe²⁺ to Ni²⁺. In an alkaline media, the FeNi₃@NC(1∶3) catalyst exhibits superior oxygen evolution reaction catalytic activities, which only requires an overpotential of 277 mV to reach a current density of 20 mA/cm². At the same time, FeNi₃@NC(1∶3) displays no obvious activity loss after continuous running for 30 h at 20 mA/cm², indicating a good durability. The excellent performances of the alloy catalysts in alkaline solution can be ascribed to their microstructural features: (1) The composites made by NC shell and alloy cores create copious active sites; (2) The NC coating layer prevents the erosion of alloy nanoparticles which thus improves the durability; (3) The three-dimensional structures well promote mass transfer and effectively suppress the gas peeling effect.

Key words: Iron-nickel alloy, Oxygen evolution reaction, Nanoparticles, Catalyst, Electrochemistry

CLC Number:

O646.5

TrendMD:

LIU Lu,WU Hanyue,LI Jing,SHE Lan. Tuning Microstructures of Iron-Nickel Alloy Catalysts for Efficient Oxygen Evolution Reaction ^†[J]. Chem. J. Chinese Universities, 2020, 41(5): 1083.

Figures/Tables 7

References 33

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