Synergistic Effect of Cobalt and Iron in Layered Double Hydroxide Catalysts for the Oxygen Evolution Reaction

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• 作者：Fengkai Yang ; Dr. Kirill Sliozberg ; Dr. Ilya Sinev ; Hendrik Antoni ; Alexander Bä ; hr ; Kevin Ollegott ; Dr. Wei Xia ; Dr. Justus Masa ; Prof. Dr. Wolfgang Grü ; nert ; Prof. Dr. Beatriz Roldan Cuenya ; Prof. Dr. Wolfgang Schuhmann and Prof. Dr. Martin Muhler
• 刊名：ChemSusChem
• 出版年：2017
• 出版时间：January 10, 2017
• 年：2017
• 卷：10
• 期：1
• 页码：156-165
• 全文大小：2249K
• ISSN：1864-564X

文摘

Co-based layered double hydroxide (LDH) catalysts with Fe and Al contents in the range of 15 to 45 at % were synthesized by an efficient coprecipitation method. In these catalysts, Fe³⁺ or Al³⁺ ions play an essential role as trivalent species to stabilize the LDH structure. The obtained catalysts were characterized by a comprehensive combination of surface- and bulk-sensitive techniques and were evaluated for the oxygen evolution reaction (OER) on rotating disk electrodes. The OER activity decreased upon increasing the Al content for the Co- and Al-based LDH catalysts, whereas a synergistic effect in Co- and Fe-based LDHs was observed, which resulted in an optimal Fe content of 35 at %. This catalyst was spray-coated on Ni foam electrodes and showed very good stability in a flow-through cell with a potential of approximately 1.53 V at 10 mA cm⁻² in 1 m KOH for at least 48 h.