Electrochemical Study of the Energetics of the Oxygen Evolution Reaction at Nickel Iron (Oxy)Hydroxide Catalysts

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• 作者：John R. Swierk ; Shannon Klaus ; Lena Trotochaud ; Alexis T. Bell ; T. Don Tilley
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：August 20, 2015
• 年：2015
• 卷：119
• 期：33
• 页码：19022-19029
• 全文大小：477K
• ISSN：1932-7455

文摘

Iron-doped nickel (oxy)hydroxide catalysts (Fe_xNi_1鈥?i>xOOH) exhibit high electrocatalytic behavior for the oxygen evolution reaction in base. Recent findings suggest that the incorporation of Fe³⁺ into a NiOOH lattice leads to nearly optimal adsorption energies for OER intermediates on active Fe sites. Utilizing electrochemical impedance spectroscopy and activation energy measurements, we find that pure NiOOH and FeOOH catalysts exhibit exceedingly high Faradaic resistances and activation energies 40鈥?0 kJ/mol^鈭? higher than those of the most active Fe_xNi_1鈥?i>xOOH catalysts. Furthermore, the most active Fe_xNi_1鈥?i>xOOH catalysts in this study exhibit activation energies that approach those previously reported for IrO₂ OER catalysts.