An aluminum/cobalt/iron/nickel alloy as a precatalyst for water oxidation. (25th January 2018)

• Record Type: Journal Article
• Authors: Najafpour, Mohammad Mahdi; Mehrabani, Somayeh; Bagheri, Robabeh; Song, Zhenlun; Shen, Jian-Ren; Allakhverdiev, Suleyman I.
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 4(2018)
• Page Start: 2083
• Page End: 2090
• Publication Date: 2018-01-25
• Subjects: Alloy -- Artificial photosynthesis -- Hydrogen production -- Water -- Water-oxidizing catalyst -- Water oxidation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.12.025
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Among different strategies, water splitting toward hydrogen production is a promising process to store energy from intermittent sources. However, the anodic water oxidation is a bottleneck for water splitting. In this paper, we report an aluminum/cobalt/iron/nickel alloy as a precatalyst for the electrochemical water oxidation. The alloy electrode contains different metal ions including cobalt, iron, and nickel which all are efficient for water oxidation is tested. We characterized this electrode using scanning electron microscopy, transmission electron microscopy, diffuse reflectance infrared Fourier transform spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical methods. After stabilization, the electrode shows an onset overpotential of 200.0 mV and affords a current density of 3.5 mA cm −2 at an overpotential of 600.0 mV in KOH solution at pH 13. Highlights: Water splitting is a promising process to store the intermittent energies. An aluminum/cobalt/iron/nickel alloy was used for water oxidation. The electrode is a reasonable and robust electrode toward water oxidation. The electrode is stable under water oxidation.