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Article Abstract
For an anion exchange membrane water electrolyzer (AEMWE), exploring bifunctional electrodes with low cost and high efficiency is a crucial task for future renewable energy systems. Herein, we report a simple method to fabricate cobalt iron oxyhydroxide (CoFeOH) bifunctional electrodes for AEMWEs. The bifunctional electrodes were prepared one-pot electrodeposition on Ti paper (TP). By adjusting the electrodeposition conditions, the morphology and composition of CoFeOH/TP could be controlled. The CoFeOH/TP electrode demonstrated the highest activity for overall water electrolysis owing to the maximized synergy effect between Co and Fe. The bifunctional activities of CoFeOH/TP were well retained at -50 and 50 mA cm for 12 h. CoFeOH/TP, which shows the highest bifunctional activity, was employed in an AEMWE single cell as the anode and cathode. The AEMWE single cell employing CoFeOH/TP showed a current density of 0.605 A cm at a cell voltage of 2.0 V. The calculated energy efficiency of the single cell is 55.7% at 2.0 A cm, which is comparable with those of the state-of-the-art AEMWE single cells with bifunctional electrodes. Furthermore, the cell voltage of the single cell with CoFeOH/TP showed negligible degradation for 50 h at 0.6 A cm.
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