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<p>The development of effective and long-lasting electrocatalysts for the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) is essential for the progress of renewable energy technologies. This study involved the synthesis of ternary NiFeWMo layered double hydroxide (LDH) along with its carbon-doped composites at varying concentrations of carbon spheres (10%, 20%, 40%, and 50%), followed by a systematic evaluation of their bifunctional catalytic activity toward both OER and MOR. Electrochemical investigations demonstrated that the NiFeWMo LDH, when doped with 20% carbon (NiFeWMo-20%Cs), displayed superior OER activity, attaining the minimal overpotential of 170&#xa0;mV and Tafel slope of 68&#xa0;mV&#xa0;dec<sup>−1</sup>. This performance is linked to an optimized equilibrium between electrical conductivity and the exposure of active sites. Conversely, the peak performance for MOR was noted in the NiFeWMo LDH that was doped with 40% carbon (NiFeWMo-40%Cs), showcasing the highest current density of 350&#xa0;mA&#xa0;cm<sup>−2</sup> which can be attributed to improved electron transfer and a greater surface area for methanol oxidation. Excessive carbon loading (50%) led to a reduction in catalytic efficiency, attributed to active site coverage and structural agglomeration. In contrast, the optimized compositions demonstrated enhanced catalytic performance. The findings underscore the promise of NiFeWMo LDH–carbon composites as effective bifunctional electrocatalysts, with NiFeWMo-20%Cs showing optimization for OER and NiFeWMo-40%Cs exhibiting enhanced MOR activity. This investigation offers significant perspectives on strategies for designing catalysts aimed at energy conversion and storage applications.</p>

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Novel ternary metal layered double hydroxide NiFeWMo-supported carbon spheres as a bifunctional electrocatalyst for oxygen evolution reaction and methanol oxidation

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Norhan H. Hassaan,
  • Waleed M. A. El Rouby,
  • Ahmed A. Farghali,
  • Abeer Enaiet Allah,
  • Abdalla Abdelwahab

摘要

The development of effective and long-lasting electrocatalysts for the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) is essential for the progress of renewable energy technologies. This study involved the synthesis of ternary NiFeWMo layered double hydroxide (LDH) along with its carbon-doped composites at varying concentrations of carbon spheres (10%, 20%, 40%, and 50%), followed by a systematic evaluation of their bifunctional catalytic activity toward both OER and MOR. Electrochemical investigations demonstrated that the NiFeWMo LDH, when doped with 20% carbon (NiFeWMo-20%Cs), displayed superior OER activity, attaining the minimal overpotential of 170 mV and Tafel slope of 68 mV dec−1. This performance is linked to an optimized equilibrium between electrical conductivity and the exposure of active sites. Conversely, the peak performance for MOR was noted in the NiFeWMo LDH that was doped with 40% carbon (NiFeWMo-40%Cs), showcasing the highest current density of 350 mA cm−2 which can be attributed to improved electron transfer and a greater surface area for methanol oxidation. Excessive carbon loading (50%) led to a reduction in catalytic efficiency, attributed to active site coverage and structural agglomeration. In contrast, the optimized compositions demonstrated enhanced catalytic performance. The findings underscore the promise of NiFeWMo LDH–carbon composites as effective bifunctional electrocatalysts, with NiFeWMo-20%Cs showing optimization for OER and NiFeWMo-40%Cs exhibiting enhanced MOR activity. This investigation offers significant perspectives on strategies for designing catalysts aimed at energy conversion and storage applications.