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<p>Environmental damage and current energy crisis have intensified global shift toward clean energy resources and sustainable to reduce dependence on fossil fuels. Among various strategies, water splitting has emerged as an efficacy process for sustainable H<sub>2</sub> generation. However, slow reaction rate of oxygen evolution reaction (OER) significantly hampers overall efficiency. In this work, a NiFe<sub>2</sub>O<sub>4</sub>/g-CN nanocomposite was fabricated via a hydrothermal route to enhance OER performance. The composite exhibited a unique structural morphology, where NiFe<sub>2</sub>O<sub>4</sub> nanoparticles were well-dispersed across the g-CN nanosheets, offering a more active spots and higher surface area (SA) for electrolyte interaction. Compared to pure NiFe<sub>2</sub>O<sub>4</sub>, the NiFe<sub>2</sub>O<sub>4</sub>/g-CN electrode demonstrated superior catalytic behavior, achieving a reduced overpotential (<i>ɳ</i>) of 198 mV at a current density (<i>j</i>) (10 mA cm<sup>−2</sup>), along with excellent operational stability over 20 h. Furthermore, the electrocatalyst exhibited a high electrochemically active surface area (ECSA) of 752.5 cm<sup>2</sup> and a favorable overpotential (<i>η</i>) 198 mV and Tafel gradient of 33 mV dec<sup>−1</sup>. The enhanced OER performance was attributed to synergistic interaction among NiFe<sub>2</sub>O<sub>4</sub> and g-CN, which facilitates efficient charge transport. Additionally, the electronic structure of NiFe<sub>2</sub>O<sub>4</sub>/g-CN contributes to improved reaction kinetics, making this composite a promising and low-cost alternative to noble metal-based OER electrocatalysts. This work highlights the potential of NiFe<sub>2</sub>O<sub>4</sub>/g-CN as a highly efficient electrode sample for future energy conversion and storage characterizations.</p><p></p>

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Evaluating the electrocatalytic efficiency of NiFe2O4/g-CN nanostructure for water splitting

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Iqra Bibi,
  • B. M. Alotaibi,
  • Abdelaziz Gassoumi,
  • Haifa A. Alyousef,
  • Albandari W. Alrowaily,
  • Hidayath Mirza,
  • Abhinav Kumar

摘要

Environmental damage and current energy crisis have intensified global shift toward clean energy resources and sustainable to reduce dependence on fossil fuels. Among various strategies, water splitting has emerged as an efficacy process for sustainable H2 generation. However, slow reaction rate of oxygen evolution reaction (OER) significantly hampers overall efficiency. In this work, a NiFe2O4/g-CN nanocomposite was fabricated via a hydrothermal route to enhance OER performance. The composite exhibited a unique structural morphology, where NiFe2O4 nanoparticles were well-dispersed across the g-CN nanosheets, offering a more active spots and higher surface area (SA) for electrolyte interaction. Compared to pure NiFe2O4, the NiFe2O4/g-CN electrode demonstrated superior catalytic behavior, achieving a reduced overpotential (ɳ) of 198 mV at a current density (j) (10 mA cm−2), along with excellent operational stability over 20 h. Furthermore, the electrocatalyst exhibited a high electrochemically active surface area (ECSA) of 752.5 cm2 and a favorable overpotential (η) 198 mV and Tafel gradient of 33 mV dec−1. The enhanced OER performance was attributed to synergistic interaction among NiFe2O4 and g-CN, which facilitates efficient charge transport. Additionally, the electronic structure of NiFe2O4/g-CN contributes to improved reaction kinetics, making this composite a promising and low-cost alternative to noble metal-based OER electrocatalysts. This work highlights the potential of NiFe2O4/g-CN as a highly efficient electrode sample for future energy conversion and storage characterizations.