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<p>Developing robust, inexpensive, and efficient electrocatalysts for hydrogen evolution via water splitting is crucial for the improvement of green hydrogen production technology. Herein, a standard three-electrode system is useful to assess the activity of single and mixed NiOx and CoOx electrocatalysts, assembled onto a glassy carbon (GC) electrode via the electrodeposition technique, toward the hydrogen evolution reaction (HER) in an alkaline medium of 0.5&#xa0;M NaOH. The net results of several electrochemical experiments (linear sweep voltammetry (LSV), current transients (<i>i</i>–<i>t</i> curves), Nyquist and Tafel plots) confirm the superiority of the NiOx/CoOx/GC (binary modified catalyst at which CoOx and NiOx are introduced to the GC surface, respectively) in terms of achieving a higher activity (61.49&#xa0;mA&#xa0;cm<sup>−2</sup> at −&#xa0;2&#xa0;V) and stability (ca. 6.8&#xa0;mA&#xa0;cm<sup>−2</sup> after 8&#xa0;h of continuous electrolysis), a lower charge transfer resistance (<i>R</i><sub>ct</sub>, 21 Ω), and a lower Tafel slope (34&#xa0;mV/decade) indicating the improved charge transfer mobility and accordingly the fastest kinetics toward HER.</p>

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Augmented Green Hydrogen Production at Binary Nickel/Cobalt Oxide Nanostructured Catalyst

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月5日

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  • Yaser M. Asal,
  • Fatma Zakaria Salem,
  • Ahmad M. Mohammad,
  • Islam M. Al-Akraa

摘要

Developing robust, inexpensive, and efficient electrocatalysts for hydrogen evolution via water splitting is crucial for the improvement of green hydrogen production technology. Herein, a standard three-electrode system is useful to assess the activity of single and mixed NiOx and CoOx electrocatalysts, assembled onto a glassy carbon (GC) electrode via the electrodeposition technique, toward the hydrogen evolution reaction (HER) in an alkaline medium of 0.5 M NaOH. The net results of several electrochemical experiments (linear sweep voltammetry (LSV), current transients (i–t curves), Nyquist and Tafel plots) confirm the superiority of the NiOx/CoOx/GC (binary modified catalyst at which CoOx and NiOx are introduced to the GC surface, respectively) in terms of achieving a higher activity (61.49 mA cm−2 at − 2 V) and stability (ca. 6.8 mA cm−2 after 8 h of continuous electrolysis), a lower charge transfer resistance (Rct, 21 Ω), and a lower Tafel slope (34 mV/decade) indicating the improved charge transfer mobility and accordingly the fastest kinetics toward HER.