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  • 1.
    Tahira, Aneela
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Dr. M. A Kazi Institute of Chemistry, University of Sindh, Jamshoro, Pakistan.
    Ibupoto, Zafar
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Dr. M. A Kazi Institute of Chemistry, University of Sindh, Jamshoro, Pakistan.
    Montecchi, Monica
    Engineering Department, University of Modena and Reggio Emilia, Modena, Italy.
    Pasquali, Luca
    Engineering Department, University of Modena and Reggio Emilia, Modena, Italy; Chemistry, IOM‐CNR Institute, Trieste, Italy; Department of Physics, University of Johannesburg, Auckland Park, South Africa.
    Tonezzer, Matteo
    MEM‐CNR, Sede di Trento‐FBK, Trento, Italy.
    Nafady, Ayman
    Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia.
    Khalil, Huda F.
    Electronics Materials Department, City of Scientific Research and Technological Applications (SRTA‐City), Alexandria, Egypt.
    Mazzaro, Raffaello
    Department of science and technology, CNR IMM, Bologna, Italy.
    Morandi, Vittorio
    Department of science and technology, CNR IMM, Bologna, Italy.
    Vagin, Mikhail
    Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, Sweden.
    Vomiero, Alberto
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Venezia Mestre, Italy.
    Role of cobalt precursors in the synthesis of Co 3 O 4 hierarchical nanostructures toward the development of cobalt‐based functional electrocatalysts for bifunctional water splitting in alkaline and acidic media2022In: Journal of the Chinese Chemical Society (Taipei), ISSN 0009-4536, E-ISSN 2192-6549, Vol. 69, no 4, p. 681-691Article in journal (Refereed)
    Abstract [en]

    The precursors have significant influence on the catalytic activity of nonprecious electrocatalysts for effective water splitting. Herein, we report active electrocatalysts based on cobalt oxide (Co3O4) hierarchical nanostructures derived from four different precursors of cobalt (acetate, nitrate, chloride, and sulfate salts) using the low-temperature aqueous chemical growth method. It has been found that the effect of precursor on the morphology of nanostructured material depends on the synthetic method. The Co3O4 nanostructures exhibited cubic phase derived from these four precursors. The Co3O4 nanostructures obtained from chloride precursor have demonstrated improved oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) compared to other precursors due relatively higher content of Co3O4 nanostructures at the surface of material. An overpotential of 400 mV versus reversible hydrogen electrode (RHE) at 10 mA cm−2 was observed for HER. The Co3O4 nanostructures derived from the chloride precursor have shown favorable reaction kinetics via 34 mV dec−1 value of the Tafel slope for HER reaction. The Co3O4 nanostructures derived from chloride precursor have also shown an excellent HER durability for 15 hr in alkaline media. Furthermore, the OER functional characterization was carried out onto Co3O4 nanostructures derived from chloride precursor exhibited 220 mV overpotential at 10 mA cm−2 and Tafel slope of 56 mV dec−1. Importantly, the reason behind the favorable catalytic activity of Co3O4 nanostructures derived from chloride precursor was linked to one order of magnitude smaller charge transfer resistance and higher amount of Co3O4 content at the surface of nanostructures than the Co3O4 nanostructures derived from other precursors. The performance of Co3O4 nanostructures derived from chloride precursor via the wet chemical method suggests that cobalt chloride precursor could be of great interest for the development of efficient, stable, nonprecious, and environmentally friendly electrocatalysts for the chemical energy conversion and storage devices.

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