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Nickel-Vanadium Layered Double Hydroxide under Water-Oxidation Reaction: New Findings and Challenges
IASBS, Dept Chem, Zanjan 4513766731, Iran.
IASBS, Dept Chem, Zanjan 4513766731, Iran.
Free Univ Berlin, Dept Phys, Arnimallee 14, D-14195 Berlin, Germany;Univ Sistan & Baluchestan, Dept Phys, Zahedan 9816745845, Iran.
Chinese Acad Sci, Key Lab Marine Mat & Related Technol, Zhejiang Key Lab Marine Mat & Protect Technol, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China;Soochow Univ, Soochow Inst Energy & Mat Innovat, Sch Phys Sci & Technol, Coll Energy, Suzhou 215006, Peoples R China;Soochow Univ, Key Lab Adv Carbon Mat & Wearable Energy Technol, Suzhou 215006, Peoples R China.
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2019 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 7, no 20, p. 17252-17262Article in journal (Refereed) Published
Abstract [en]

Nickel-vanadium layered double hydroxide has recently been considered as a highly active, low-cost electrocatalyst and as a benchmark non-noble metal-based electrocatalyst for water oxidation. The material showed a current density of 27 mA/cm(2) at an overpotential of 350 mV, which is comparable to the best-performing nickel-iron-layered double hydroxides for water oxidation in alkaline media. The enhanced conductivity and facile electron transfer were suggested among important factors for the high activity of nickel-vanadium layered double hydroxide. In the present study, the stability of an Ni-V catalyst was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS), and electrochemical characterization methods. These methods show that the initial Ni-V catalyst during water oxidation in alkaline conditions is converted from an initial alpha-Ni(OH)(2) phase to a partially oxidized alpha-Ni(OH)(2/)NiOOH phase and VO(4)(3-)ions. We carefully evaluate the stability of the catalysts and analyze the compositional changes during prolonged water-oxidation conditions using inductively coupled plasma-optical emission spectroscopy (ICP-OES). The experiments using both Fe-free electrolyte and Fe-free nickel-vanadium layered double hydroxide reveal that vanadium do not affect the water-oxidizing activity of alpha-Ni(OH)(2).

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 7, no 20, p. 17252-17262
Keywords [en]
Conversion, Nickel-vanadium, Oxygen evolution, True catalyst, Layered double hydroxide, Water oxidation
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-396964DOI: 10.1021/acssuschemeng.9b03971ISI: 000492117200035OAI: oai:DiVA.org:uu-396964DiVA, id: diva2:1369771
Funder
German Research Foundation (DFG), SPP 1613German Research Foundation (DFG), DA 402/7-2Available from: 2019-11-13 Created: 2019-11-13 Last updated: 2019-11-13Bibliographically approved

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Chernev, PetkoGörlin, Mikaela

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