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Mesoporous nanostructures of NiCo-LDH/ZnCo2O4 as an efficient electrocatalyst for oxygen evolution reaction

Shamloofard, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcis.2021.07.059
  3. Publisher: Academic Press Inc , 2021
  4. Abstract:
  5. Increasing energy demands for pollution-free and renewable energy technologies have stimulated intense research on the development of inexpensive, highly efficient, and stable non-noble metal electrocatalysts for oxygen evolution reaction (OER). In this study, a superior OER performance was achieved using a tri-metallic (Zn, Co, Ni) high-performance electrocatalyst. We successfully fabricated a peony-flower-like hierarchical ZnCo2O4 through an additive-free hydrothermal reaction followed by heat treatment. Then NiCo-LDH (layered double hydroxides) nano-flakes was electrodeposited on the ZnCo2O4/GCE surface to prepare NiCo-LDH/ZnCo2O4/GCE which was used as electrode for OER. The structure and morphology of the catalysts were characterized by several techniques including Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, elemental mapping and Brunauer–Emmett–Teller method. The NiCo-LDH/ZnCo2O4 catalyst provided high catalytic activity toward OER under alkaline condition (1.0 M KOH) with a low overpotential of 260 mV to drive the benchmark current density of 10 mA cm−2 and Tafel slope of 62 mV dec−1, as well as long-term stability and high turnover frequency of 0.0641 s−1 at overpotential of 340 mV. The NiCo-LDH/ZnCo2O4 catalyst was found to perform significantly better than NiCo-LDH, ZnCo2O4, NiCo-LDH/Co3O4, Co3O4, and commercial RuO2 catalysts. The outstanding OER performance of NiCo-LDH/ZnCo2O4 catalyst, which may be attributed to the large specific surface area, accelerated mass and electron transport, and synergistic effect of multiple hybrid materials, makes it a promising catalyst for OER. © 2021 Elsevier Inc
  6. Keywords:
  7. Catalyst activity ; Electrocatalysts ; Electrodes ; Electron transport properties ; Energy dispersive spectroscopy ; Field emission microscopes ; Fourier transform infrared spectroscopy ; Heat treatment ; Hybrid materials ; Morphology ; Oxygen ; Oxygen evolution reaction ; Potassium hydroxide ; Precious metals ; Ruthenium compounds ; Scanning electron microscopy ; Slope stability ; Zinc compounds ; Energy dispersive X ray spectroscopy ; Field emission scanning electron microscopy ; Hydrothermal reaction ; Large specific surface areas ; Layered double hydroxides ; Oxygen evolution reaction (oer) ; Renewable energy technologies ; Structure and morphology ; Nickel compounds ; Cobalt ; Hydroxide ; Nanoflake ; Nanomaterial ; Nickel ; Ruthenium derivative ; Zinc ; Adsorption ; Analytic method ; Catalyst ; Chemical structure ; Current density ; Desorption ; Electrochemical analysis ; Electrodeposition ; Electron transport ; Elemental analysis ; Mass ; Molecular stability ; Nonhuman ; Oxygen evolution ; Pore size ; Pore volume ; Porosity ; Reaction optimization ; Surface area ; Synthesis ; X ray diffraction
  8. Source: Journal of Colloid and Interface Science ; Volume 604 , 2021 , Pages 832-843 ; 00219797 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0021979721011243