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Metallized Ni(OH)2·NiO/FeOOH on Ni foam as Highly Effective Water Oxidation Catalyst Prepared by Surface Treatment: Oxidation-Corrosion Equilibrium

preprint
submitted on 03.03.2021, 15:09 and posted on 04.03.2021, 11:44 by Fei Wang, Xiaoxian Sun, Yi Wang, Huawei Zhou, Jie Yin, Xianxi Zhang
The surface treatment method has a great influence on the structure and properties of applied materials for interface catalysis. In this study, we prepare Ni(OH)2·NiO/FeOOH by surface treatment in acid solution using oxidation-corrosion equilibrium (OCE). For comparison, we also treat Ni foam with the same process in alkaline solution. Ni(OH)2·NiO/FeOOH can arrive steady-morphology and metallization by oxidation-corrosion equilibrium and exhibits superior catalytic activity as water oxidation catalyst. Ni(OH)2·NiO/FeOOH(OCE) needs only 232 mV to reach a current density of 10 mA cm-2, while it is 254 mV for a reference IrO2/Ni foam. The mechanism study shows that the small charge transfer resistance (2.04 Ωcm2) is favorable for the rapid interface electron exchange between Ni(OH)2·NiO/FeOOH(OCE) and reactive species in water oxidation. In addition, the results of X-ray photoelectron spectroscopy and series impedance show that the catalyst is metallic property in virtue of exposed mental Ni in Ni(OH)2·NiO/FeOOH(OCE). The volume ratio of hydrogen to oxygen (about 2:1) indicates overall water splitting by the double electrode system. When the volume ratio of hydrogen to oxygen is 2:1, the Faraday efficiency of H2 or O2 is close to 100%. Ni(OH)2·NiO/FeOOH(OCE) exhibits good stability for one month. The research results provide a feasible approach for finding low cost metallized catalysts to replace noble metal as water oxidation catalysts and improving the efficiency of water splitting.

Funding

This work was financially supported by the Shandong Prov-ince Natural Science Foundation (Grant No. ZR2019MB021)

History

Email Address of Submitting Author

zhouhuawei@lcu.edu.cn

Institution

School of Chemistry and Chemical Engineering, Liaocheng University

Country

China

ORCID For Submitting Author

0000-0002-9428-5400

Declaration of Conflict of Interest

No

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