Hydration-Effect-Promoting Ni-Fe Oxyhydroxide Catalysts for Neutral Water Oxidation.

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ID: 83284
2020
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Abstract
Oxygen evolution reaction (OER) catalysts that function efficiently in pH-neutral electrolyte are of interest for biohybrid fuel and chemical production. The low concentration of reactant in neutral electrolyte mandates that OER catalysts provide both the water adsorption and dissociation steps. Here it is shown, using density functional theory simulations, that the addition of hydrated metal cations into a Ni-Fe framework contributes water adsorption functionality proximate to the active sites. Hydration-effect-promoting (HEP) metal cations such as Mg and hydration-effect-limiting Ba into Ni-Fe frameworks using a room-temperature sol-gel process are incorporated. The Ni-Fe-Mg catalysts exhibit an overpotential of 310 mV at 10 mA cm in pH-neutral electrolytes and thus outperform iridium oxide (IrO ) electrocatalyst by a margin of 40 mV. The catalysts are stable over 900 h of continuous operation. Experimental studies and computational simulations reveal that HEP catalysts favor the molecular adsorption of water and its dissociation in pH-neutral electrolyte, indicating a strategy to enhance OER catalytic activity.
Reference Key
wang2020hydrationeffectpromotingadvanced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wang, Ning;Cao, Zhen;Zheng, Xueli;Zhang, Bo;Kozlov, Sergey M;Chen, Peining;Zou, Chengqin;Kong, Xiangbin;Wen, Yunzhou;Liu, Min;Zhou, Yansong;Dinh, Cao Thang;Zheng, Lirong;Peng, Huisheng;Zhao, Ying;Cavallo, Luigi;Zhang, Xiaodan;Sargent, Edward H;
Journal advanced materials (deerfield beach, fla)
Year 2020
DOI
10.1002/adma.201906806
URL
Keywords
oxygen evolution reaction ni-fe catalysts hydration effect neutral electrolytes

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