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<p>NiO<sub>x</sub> nanocatalysts with two distinct morphologies, nano-spindles and nano-plates, were synthesized and evaluated for oxygen evolution reaction (OER) performance. Spindle-like NiO<sub>x</sub> was prepared <i>via</i> a hydrothermal reaction of nickel nitrate and urea with cetyltrimethylammonium bromide as a surfactant at 120&#xa0;°C for 24&#xa0;h, forming Ni(OH)<sub>2</sub>-based intermediates that were subsequently calcined at 300&#xa0;°C for 3&#xa0;h. In contrast, platelet-like Ni(OH)<sub>2</sub> nanocrystals were obtained using nickel(II) acetate and KOH at 180&#xa0;°C for 24&#xa0;h, followed by calcination at 400&#xa0;°C or 500&#xa0;°C for 4&#xa0;h to yield NiO<sub>x</sub> nano-plates. The NiO<sub>x</sub> nano-spindles exhibited an OER overpotential of 395&#xa0;mV at 10&#xa0;mA/cm<sup>2</sup>, whereas the NiO<sub>x</sub> nano-plates annealed at 400&#xa0;°C and 500&#xa0;°C showed overpotentials of 565&#xa0;mV and 474&#xa0;mV at 10&#xa0;mA/cm<sup>2</sup>, respectively. Structural characterization and X-ray photoemission spectroscopy indicate these differences arise from morphology-dependent surface structures that govern catalytic activity.</p> Graphical abstract <p></p>

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Lowering oxygen evolution overpotential via morphology control of NiOx nanocatalysts

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月6日

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  • Prabhu Bharathan,
  • Can Li,
  • Joseph Delgado,
  • Lihua Zhang,
  • Areesha Maryam,
  • Tara P. Dhakal,
  • Jiye Fang

摘要

NiOx nanocatalysts with two distinct morphologies, nano-spindles and nano-plates, were synthesized and evaluated for oxygen evolution reaction (OER) performance. Spindle-like NiOx was prepared via a hydrothermal reaction of nickel nitrate and urea with cetyltrimethylammonium bromide as a surfactant at 120 °C for 24 h, forming Ni(OH)2-based intermediates that were subsequently calcined at 300 °C for 3 h. In contrast, platelet-like Ni(OH)2 nanocrystals were obtained using nickel(II) acetate and KOH at 180 °C for 24 h, followed by calcination at 400 °C or 500 °C for 4 h to yield NiOx nano-plates. The NiOx nano-spindles exhibited an OER overpotential of 395 mV at 10 mA/cm2, whereas the NiOx nano-plates annealed at 400 °C and 500 °C showed overpotentials of 565 mV and 474 mV at 10 mA/cm2, respectively. Structural characterization and X-ray photoemission spectroscopy indicate these differences arise from morphology-dependent surface structures that govern catalytic activity.

Graphical abstract