Electrodeposited Co-Doped Fe3O4 Thin Films as Efficient Catalysts for the Oxygen Evolution Reaction

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Author: Han, S.; Liu, S.; Yin, S.; Chen, L.; He, Z.

Description: The development of highly active electrocatalysts at a low cost is essential to the process of generating hydrogen fuel through electrochemical and photoelectrochemical water splitting. Here, we report a comprehensive investigation of the one-step electrodeposited cobalt-doped magnetite (CoxFe3-xO4, 0 < x < 1) thin films as active and stable OER catalysts in alkaline solutions. The CoxFe3-xO4 thin film electrode can be fabricated in minutes or even tens of seconds. The Co-doping concentration, thickness, and orientation of the CoxFe3-xO4 films can be simply controlled by varying the deposition potential, deposition time, and the substrate, respectively. The dependences of the catalytic activity of the CoxFe3-xO4 films on the composition, thickness, and orientation of growth are explored. The CoxFe3-xO4 films exhibit greatly enhanced catalytic activities toward the OER compared to the Fe3O4 thin film. The polycrystalline CoxFe3-xO4 film deposited at −0.88 VAg/AgCl for 150 seconds exhibits the highest catalytic activity with an overpotential of ∼0.42 V at a current density of 10 mA cm−2, a Tafel slope of 53 mV dec−1, and an exchange current density of about 2.39 Ã— 10−10 A cm−2, which are comparable to those of Co3O4. Besides, the CoxFe3-xO4 films possess good stability during the long-term electrolysis at a current density of 10 mA cm−2 in 1 M NaOH. The satisfactory catalytic activity and stability combined with the simplicity of fabrication make the electrodeposited CoxFe3-xO4 films economically and environmentally preferable compared to Co3O4 as catalysts for the oxygen evolution reaction.

Subject headings: Electrodeposition; CoxFe3-xO4; Catalytic activity; Oxygen evolution reaction; Thin films

Publication year: 2016

Journal or book title: Electrochimica Acta

Volume: 210

Pages: 942-949

Find the full text : https://www.sciencedirect.com/science/article/pii/S0013468616312853

Find more like this one (cited by): https://scholar.google.com/scholar?cites=15178915835910934412&as_sdt=1000005&sciodt=0,16&hl=en

Type: Journal Article

Serial number: 1813