Bimetallic iron-iridium alloy nanoparticles supported on nickel foam as highly efficient and stable catalyst for overall water splitting at large current density

[Display omitted] •FeIr alloy with ultra-low Ir-loading is prepared for overall water splitting.•It needs ultralow overpotential for HER (η10 = 6.2 mV) and OER (η20 = 200 mV).•An alkaline electrolyze only requires 1.48 V to drive 10 mA cm−2.•It can maintain at 150 mA cm−2 for 504 h for overall water...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2020-12, Vol.278, p.119327, Article 119327
Main Authors: Shen, Fang, Wang, Yamei, Qian, Guangfu, Chen, Wei, Jiang, Wenjie, Luo, Lin, Yin, Shibin
Format: Article
Language:English
Subjects:
Bimetals
Catalysis
Catalysts
Current density
Iridium
Iridium base alloys
Iron/iridium bimetallic alloy
Large current density
Metal foams
Nanoalloys
Nanoparticles
Nickel
Noble metals
Overall water splitting
Splitting
Stability
Substrates
Water splitting
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Summary:[Display omitted] •FeIr alloy with ultra-low Ir-loading is prepared for overall water splitting.•It needs ultralow overpotential for HER (η10 = 6.2 mV) and OER (η20 = 200 mV).•An alkaline electrolyze only requires 1.48 V to drive 10 mA cm−2.•It can maintain at 150 mA cm−2 for 504 h for overall water splitting. In this work, FeIr bimetallic alloy self-supported on nickel foam is prepared by hydrothermal method, with average particle size of 2.17 nm and the Ir-loading is only 0.936 wt.%. It displays ultralow overpotentials for OER (200 mV) and HER (16.6 mV) at 20 mA cm−2 in alkaline media, which is superior to the ever reported HER catalysts. For overall water splitting, it only needs 1.48 V to derive a current density of 10 mA cm−2, and it also demonstrates an outstanding long-term stability with an ignorable decline in performance after testing 504 h at the current density of 150 mA cm−2. The excellent performance is ascribed to the ultrasmall FeIr alloy, the 3D conductive substrate, and the ethylene-glycol ligand environment facilitates highly efficient HER through hydrogen spillover. Thus, this work undoubtedly provides a promising method for developing ultralow-loading noble metal catalysts with excellent performance at large current density for overall water splitting.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.119327