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Microwave-assisted facile synthesis of cobalt[sbnd]iron oxide nanocomposites for oxygen production using alkaline anion exchange membrane water electrolysis.

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Title: Microwave-assisted facile synthesis of cobalt[sbnd]iron oxide nanocomposites for oxygen production using alkaline anion exchange membrane water electrolysis.
Authors: Chen, Guan-Cheng1 (AUTHOR), Wondimu, Tadele Hunde1 (AUTHOR), Huang, Hsin-Chih1 (AUTHOR), Wang, Kai-Chin1 (AUTHOR), Wang, Chen-Hao1 (AUTHOR) chwang@mail.ntust.edu.tw
Source: International Journal of Hydrogen Energy. Apr2019, Vol. 44 Issue 21, p10174-10181. 8p.
Subjects: Hydrogen evolution reactions, Water electrolysis, Iron oxides, Metallic oxides, Precious metals, Metal catalysts, Cobalt
Abstract: In this study, a rapid, scalable, and cost-effective method was developed for synthesizing cobalt–iron metal oxide catalysts for water electrolysis. Cobalt-iron metal oxide catalysts were synthesized using the microwave-assisted hydrothermal methods by varying the molar ratios of cobalt and iron. When the cobalt to iron ratio was 2:1, its electrolytic cell yielded the onset potential of only 1.56 V at 10 mA cm−2, which is close to the thermodynamically reversible potential. When its cell potential was at 1.8 V, the cell current density was approximately 130 mA cm−2. The results of the stability test showed a steady-state cell current density of 130 mA cm−2 and remained constant for more than 16 h at a continuous cell potential of 1.8 V. Compared with other catalysts, cobalt–iron metal oxide catalysts showed lower overpotential and lower Tafel slope than did conventional precious metal catalysts such as PtO 2 and IrO 2. Cobalt-iron metal oxide catalysts serve as an inexpensive route to large-scale commercialization through facile synthesis for enhanced electrochemical water splitting. Image 1 • Co 2 Fe 1 was synthesized by microwave assisted hydrothermal method. • Electrochemical activity of Co 2 Fe 1 for OER was studied. • Amorphous nature and particle size of Co 2 Fe 1. • Co 2 Fe 1 attains lower overpotential of 1.56 V for 10 mAcm−2 and 47.36 mV dec−1. • Co 2 Fe 1 was stable in 1 M KOH at 130 mAcm−2 for more than 16 h. [ABSTRACT FROM AUTHOR]
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Abstract:In this study, a rapid, scalable, and cost-effective method was developed for synthesizing cobalt–iron metal oxide catalysts for water electrolysis. Cobalt-iron metal oxide catalysts were synthesized using the microwave-assisted hydrothermal methods by varying the molar ratios of cobalt and iron. When the cobalt to iron ratio was 2:1, its electrolytic cell yielded the onset potential of only 1.56 V at 10 mA cm−2, which is close to the thermodynamically reversible potential. When its cell potential was at 1.8 V, the cell current density was approximately 130 mA cm−2. The results of the stability test showed a steady-state cell current density of 130 mA cm−2 and remained constant for more than 16 h at a continuous cell potential of 1.8 V. Compared with other catalysts, cobalt–iron metal oxide catalysts showed lower overpotential and lower Tafel slope than did conventional precious metal catalysts such as PtO 2 and IrO 2. Cobalt-iron metal oxide catalysts serve as an inexpensive route to large-scale commercialization through facile synthesis for enhanced electrochemical water splitting. Image 1 • Co 2 Fe 1 was synthesized by microwave assisted hydrothermal method. • Electrochemical activity of Co 2 Fe 1 for OER was studied. • Amorphous nature and particle size of Co 2 Fe 1. • Co 2 Fe 1 attains lower overpotential of 1.56 V for 10 mAcm−2 and 47.36 mV dec−1. • Co 2 Fe 1 was stable in 1 M KOH at 130 mAcm−2 for more than 16 h. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2019.02.215