Nanosized rambutan-like nickel oxides as electrochemical sensor and pseudocapacitor

Mohamed Khairy, Sherif A. El-Safty

    Research output: Contribution to journalArticle

    35 Citations (Scopus)

    Abstract

    The development of meticulous nanoscale porous designs with advanced properties have been attracted considerable interest because of their large surface areas, dispersion of active sites at different pore length scales and shortened diffusion paths that facilitates the rapid migration of electrolyte ions. These features of porous structures have a direct link to their electrochemical performance in energy and sensing systems. In the current study we report large scale-up production, low-cost manufacturing, and high-purity product of NiO nanostructures with rambutan-like morphology (NRs) via a microwave-assisted approach. The electrochemical measurements of CV, galvanostatic charge-discharge and the impedance spectrum were used to investigate the electrochemical performance of the NiO NRs electrodes. The NiO NRs exhibit a reliable electrochemical sensor for hydroxide ion in harsh environments and high-performance recyclable pesudocapacitor. This electrochemical performance of NiO NRs is significantly related to their unique morphology, size, and pore size distribution that enhance the diffusion of the electrolyte through the 3D porous network. These key factors induced high specific capacitance and reliably detect hydroxide ions within a wide concentration range, a detection limit of 22 μM (pH 9.3), and high sensitivity of 13.9 × 10-3 A/M. Therefore, such findings demonstrated the potential of free-standing NiO NR electrodes for developing high-performance electrochemical devices.

    Original languageEnglish
    Pages (from-to)644-652
    Number of pages9
    JournalSensors and Actuators, B: Chemical
    Volume193
    DOIs
    Publication statusPublished - 2014 Mar 31

    Fingerprint

    Electrochemical sensors
    Nickel oxide
    nickel oxides
    Electrolytes
    Electrodes
    sensors
    Ions
    Pore size
    Nanostructures
    Capacitance
    Microwaves
    hydroxides
    electrolytes
    porosity
    ions
    electrodes
    Costs
    purity
    manufacturing
    capacitance

    Keywords

    • Hydroxide ions
    • Microwave-assisted approach
    • Nickel oxide
    • Pseudocapacitors
    • Rambutan-like morphology

    ASJC Scopus subject areas

    • Instrumentation
    • Materials Chemistry
    • Surfaces, Coatings and Films
    • Metals and Alloys
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

    Cite this

    Nanosized rambutan-like nickel oxides as electrochemical sensor and pseudocapacitor. / Khairy, Mohamed; El-Safty, Sherif A.

    In: Sensors and Actuators, B: Chemical, Vol. 193, 31.03.2014, p. 644-652.

    Research output: Contribution to journalArticle

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