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

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    adma201906806.pdf
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    Type
    Article
    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 cc
    Zhang, Xiaodan cc
    Sargent, E. cc
    KAUST Department
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2020-01-16
    Online Publication Date
    2020-01-16
    Print Publication Date
    2020-02
    Embargo End Date
    2021-01-18
    Permanent link to this record
    http://hdl.handle.net/10754/661104
    
    Metadata
    Show full item record
    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.
    Citation
    Wang, N., Cao, Z., Zheng, X., Zhang, B., Kozlov, S. M., Chen, P., … Sargent, E. H. (2020). Hydration-Effect-Promoting Ni–Fe Oxyhydroxide Catalysts for Neutral Water Oxidation. Advanced Materials, 1906806. doi:10.1002/adma.201906806
    Sponsors
    N.W., Z.C., and X.Z. contributed equally to this work. This work was supported by the Ontario Research Fund – Research Excellence Program, the Natural Sciences and Engineering Research Council of Canada, and the CIFAR Bio-Inspired Solar Energy program. N.W. and X.D.Z. acknowledge support from International Cooperation Projects of the Ministry of Science and Technology (2014DFE60170), National Natural Science Foundation of China (61474065), and (61674084), Tianjin Research Key Program of Science and Technology (18ZXJMTG00220), 111 Project (B16027), and Fundamental Research Funds for the Central Universities. B.Z. and H.S.P. acknowledge funding from Ministry of Science and Technology (2016YFA0203302), the National Natural Science Foundation of China (21875042), and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and Science and Technology Commission of Shanghai Municipality (18QA1400800). This work benefited from access to the 1W1B beamline at Beijing Synchrotron Radiation Facility. The TEM studies in this work were supported by Jingshan Luo. The simulations were performed using the KAUST supercomputer (HPC).
    Publisher
    Wiley
    Journal
    Advanced materials (Deerfield Beach, Fla.)
    DOI
    10.1002/adma.201906806
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201906806
    ae974a485f413a2113503eed53cd6c53
    10.1002/adma.201906806
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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