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Engineering Mesoporous NiO with Enriched Electrophilic Ni3+ and O toward Efficient Oxygen Evolution

1
National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
2
Department of Chemistry and Applied Chemistry, Changji University, Changji 831100, China
3
College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
*
Authors to whom correspondence should be addressed.
Catalysts 2018, 8(8), 310; https://doi.org/10.3390/catal8080310
Received: 29 June 2018 / Revised: 26 July 2018 / Accepted: 26 July 2018 / Published: 30 July 2018
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Abstract

Tremendous efforts have been devoted to develop low-cost and highly active electrocatalysts for oxygen evolution reaction (OER). Here, we report the synthesis of mesoporous nickel oxide by the template method and its application in the title reaction. The as-prepared mesoporous NiO possesses a large surface area, uniform mesopores, and rich surface electrophilic Ni3+ and O species. The overpotential of meso-NiO in alkaline medium is 132 mV at 10 mA cm−1 and 410 mV at 50 mA cm−1, which is much smaller than that of the other types of NiO samples. The improvement in the OER activity can be ascribed to the synergy of the large surface area and uniform mesopores for better mass transfer and high density of Ni3+ and O species favoring the nucleophilic attack by OH to form a NiOOH intermediate. The reaction process and the role of electrophilic Ni3+ and O were discussed in detail. This results are more conducive to the electrochemical decomposition of water to produce hydrogen fuel as a clean and renewable energy. View Full-Text
Keywords: oxygen evolution reaction; mesoporous NiO; water splitting; nucleophilic attack; electrophilic Ni3+ and O oxygen evolution reaction; mesoporous NiO; water splitting; nucleophilic attack; electrophilic Ni3+ and O
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, X.; Zhai, Z.-Y.; Chen, Z.; Zhang, L.-Z.; Zhao, X.-F.; Si, F.-Z.; Li, J.-H. Engineering Mesoporous NiO with Enriched Electrophilic Ni3+ and O toward Efficient Oxygen Evolution. Catalysts 2018, 8, 310.

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