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journal article·2020-02Open access

Hydration‐Effect‐Promoting Ni–Fe Oxyhydroxide Catalysts for Neutral Water Oxidation

Ning Wang, Zhen Cao, Xueli Zheng, Bo Zhang, Sergey M. Kozlov, Peining Chen, Chengqin Zou, Xiangbin Kong, Yunzhou Wen, Min Liu, Yansong Zhou, Cao Thang Dinh, Lirong Zheng, Huisheng Peng, Ying Zhao, Luigi Cavallo, Xiaodan Zhang, Edward H. Sargent

Advanced Materials· Volume 32· Issue 8
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Abstract

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 Mg2+ and hydration‐effect‐limiting Ba2+ 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−2 in pH‐neutral electrolytes and thus outperform iridium oxide (IrO2) 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.
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Research context

Energy storageCatalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Copper-based nanomaterials and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Photoelectronic Thin Film Devices and Technology of Nankai University Tianjin 300350 P. R. China

Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Tianjin 300350 P. R. China

Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 P. R. China

Renewable Energy Conversion and Storage Center of Nankai University Tianjin 300072 P. R. China

Department of Electrical and Computer Engineering University of Toronto 35 St George Street Toronto Ontario M5S 1A4 Canada

Physical Sciences and Engineering Division (PSE) KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia

State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials Fudan University Shanghai 200438 China

Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

Funding

Natural Sciences and Engineering Research Council of Canada · Ministry of Science and Technology · National Natural Science Foundation of China

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