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<p>A novel Fe-Cu metal organic framework (MOF) anchored on multi-walled carbon nanotubes (Fe-Cu MOF@MWCNTs) was successfully prepared through a solvothermal synthesis approach using equimolar Cu and Fe nitrate precursors with 2-amino terephthalate as the organic linker, followed by the incorporation of varying amounts (5–15 wt%) of MWCNTs. Physical and chemical characterization revealed the preservation of the MOF crystalline structure, alongside characteristic MWCNT features, suggesting efficient metal incorporation and effective integration of carbon nanotubes. The optimized composite with 10 wt% MWCNTs displayed a total surface area of 124&#xa0;m<sup>2</sup>/g along with a clearly developed mesoporous architecture. Electrochemical evaluations in both 1.0&#xa0;M KOH and 1.0&#xa0;M H<sub>2</sub>SO<sub>4</sub> electrolytes demonstrated good bifunctional catalytic performance. For the oxygen evolution reaction (OER), current density of 10&#xa0;mA cm<sup>−2</sup> was attained at a low overpotential of 260 mV with a Tafel slope of 104 mV/dec, while the hydrogen evolution reaction (HER) reached 10&#xa0;mA cm<sup>−2</sup> at − 203 mV, accompanied by a Tafel slope of 40 mV/dec. These performance parameters significantly exceeded those of the parent Fe–Cu MOF, indicating effective synergistic interplay between the Fe–Cu catalytic sites and the conductive MWCNTs. This Fe–Cu MOF@MWCNTs nanohybrid offers an excellent bifunctional electrocatalyst for water splitting reactions.</p>

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Multi-walled Carbon Nanotube Integrated Iron–Copper Metal Organic Framework Mesoporous Composite as an Efficient Bifunctional Electrocatalyst for Water Splitting Reaction

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Gowdagere Ravinandana Deepak Raj,
  • Murudagalli Basavaraju Shivaswamy,
  • Melajipura Basavaraju Kavyashree,
  • Madapura Suresh Sanjana,
  • Konanuru Narashimhamurthy Mukunda Murthy,
  • Madanahalli Ankanathappa Sangamesha,
  • Honnegowdanahalli Shivabasappa Nagendra Prasad

摘要

A novel Fe-Cu metal organic framework (MOF) anchored on multi-walled carbon nanotubes (Fe-Cu MOF@MWCNTs) was successfully prepared through a solvothermal synthesis approach using equimolar Cu and Fe nitrate precursors with 2-amino terephthalate as the organic linker, followed by the incorporation of varying amounts (5–15 wt%) of MWCNTs. Physical and chemical characterization revealed the preservation of the MOF crystalline structure, alongside characteristic MWCNT features, suggesting efficient metal incorporation and effective integration of carbon nanotubes. The optimized composite with 10 wt% MWCNTs displayed a total surface area of 124 m2/g along with a clearly developed mesoporous architecture. Electrochemical evaluations in both 1.0 M KOH and 1.0 M H2SO4 electrolytes demonstrated good bifunctional catalytic performance. For the oxygen evolution reaction (OER), current density of 10 mA cm−2 was attained at a low overpotential of 260 mV with a Tafel slope of 104 mV/dec, while the hydrogen evolution reaction (HER) reached 10 mA cm−2 at − 203 mV, accompanied by a Tafel slope of 40 mV/dec. These performance parameters significantly exceeded those of the parent Fe–Cu MOF, indicating effective synergistic interplay between the Fe–Cu catalytic sites and the conductive MWCNTs. This Fe–Cu MOF@MWCNTs nanohybrid offers an excellent bifunctional electrocatalyst for water splitting reactions.