Chemical deposition and exfoliation from liquid crystal template: Nickel/nickel (II) hydroxide nanoflakes electrocatalyst for a non-enzymatic glucose oxidation reaction
| Autor: | Syed Farooq Adil, Abdulrahman Al-Warthan, Mohamed A. Ghanem, Adibah M. Almutairi, Mohammed Rafi Shaik, Etab M. Almutairi |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Nickel hydroxide
General Chemical Engineering Nickel(II) hydroxide chemistry.chemical_element General Chemistry Electrocatalyst Exfoliation joint Catalysis chemistry.chemical_compound Nickel Chemistry chemistry Specific surface area Nanoflakes Glucose oxidation Hydroxide Liquid crystal template Cyclic voltammetry QD1-999 Nuclear chemistry |
| Zdroj: | Arabian Journal of Chemistry, Vol 15, Iss 1, Pp 103467-(2022) |
| ISSN: | 1878-5352 |
| Popis: | This work reports the synthesis of nickel/nickel hydroxides nanoflakes (Ni/Ni(OH)2-NFs) at room temperature via a novel chemical deposition and exfoliation from a liquid crystal template mixture. The nickel ions dissolved in the interstitial aqueous domain of the Brij®78 hexagonal liquid crystal template were deposited by a reducing agent of sodium borohydride that concurrently reduces the nickel ions and generates extreme hydrogen gas bubbles, that exfoliated the nickel/nickel hydroxide layers. The Ni/Ni(OH)2-NFs crystal structure, morphology, and surface area characterizations revealed the formation of semi-crystalline α-Ni(OH)2 nanoflakes with a thickness of approximately 10 nm and a specific surface area of about 135 m2/g. The electrochemical measurements of cyclic voltammetry, chronoamperometry, and impedance analysis showed that the Ni/Ni(OH)2-NFs exhibited significant performance for the glucose non-enzymatic oxidation in an alkaline solution in comparison to the bare-nickel hydroxide (bare-Ni(OH)2) deposited without surfactant. The Ni/Ni(OH)2-NFs electrode showed superior glucose oxidation activity over the bare-Ni(OH)2 catalyst with a sensitivity of 1.078 mA mM−1 cm−2 with a linear concentration dependency range from 0.2 to 60 mM and a detection limit of 0.2 mM (S/N = 3). The enhanced electrochemical active surface area and mesoporosity of the 2D nanoflakes make the Ni/Ni(OH)2-NFs a promising catalyst in the application of glucose non-enzymatic sensing. |
| Databáze: | OpenAIRE |
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