Journal
ACS APPLIED NANO MATERIALS
Volume 1, Issue 2, Pages 617-624Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.7b00122
Keywords
water splitting oxygen evolution reaction; iron phosphide; phosphate; hollow nanostructures
Funding
- European Horizon 2020 project Critcat [686053]
- Portuguese Foundation of Science and Technology (FCT) [IF/2014/01595, PTDC/CTM-ENE/2349/2014, 016660]
- Fundação para a Ciência e a Tecnologia [PTDC/CTM-ENE/2349/2014] Funding Source: FCT
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The oxygen evolution reaction (OER) is a half-cell reaction that is of importance to many electrochemical processes, especially for electrochemical and photoelectrochemical water splitting. Developing efficient, durable, and low-cost OER electrocatalysts comprising Earth-abundant elements has been in the focus of electrocatalysis research. Herein, we report a cost-effective, scalable, and template-free approach to the fabrication of hollow iron phosphide phosphate (FeP-FePxOy) composite nanotubes (NTs), which is realized by hydrothermal growth of iron oxy-hydroxide nanorods (NRs) and a subsequent postphosphorization treatment. The hollow interior of NTs results from the Kirkendall effect occurring upon phosphorization. When used to catalyze the OER in basic medium, the as-synthesized FeP-FePxOy composite NTs exhibit excellent catalytic activity, delivering the benchmark current density of 10 mA cm(-2) at a low overpotential of 280 mV and showing a small Tafel slope of 48 mV dec(-1) and a high turnover frequency of 0.10 s(-1) at the overpotential of 350 mV. Moreover, the composite NTs demonstrate outstanding long-term stability, capable of catalyzing the OER at 10 mA cm(-2) for 42 h without increasing the overpotential, holding substantial potential for use as active and inexpensive anode catalysts in water electrolyzers.
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