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<p>The development of nickel-based multi-alloy catalytic electrodes for methanol oxidation reactions (MOR) holds significant potential for advancing new energy technologies. The study fabricated a biomorphic Ni<sub>6</sub>MnFeCoCu multi-element porous alloy foil via filter paper template-assisted impregnation and carbonization–reduction. The effect of selenization treatment on the phase composition, microstructure, and MOR performance of Ni<sub>6</sub>MnFeCoCu has been investigated. The results showed that biomorphic nickel-based multialloy foils inherited the porous fibers structure of the filter paper template. The main phase of Ni<sub>6</sub>MnFeCoCu are a face-centered cubic multi-element metallic phase and MnO phase. With increasing selenization temperature, the large particles on the surface of the fiber struts gradually presented; Ni in Ni<sub>6</sub>MnFeCoCu preferentially form NiSe<sub>2</sub> with Se, followed by Cu and Fe, resulting in the formation of biphasic nickel selenide (NiSe<sub>2</sub> and Ni<sub>3</sub>Se<sub>4</sub>), Cu<sub>2−<i>x</i></sub>Se, and Cu<sub>0.41</sub>Fe<sub>0.60</sub>Se<sub>1.99</sub> at 400&#xa0;℃. The locally controlled charge, attributed to the synergistic effect of multi-metals and the incorporation of Se, enabled the optimized Ni<sub>6</sub>MnFeCoCu-Se<sub>350</sub> catalytic electrode to exhibit high methanol oxidation reaction (MOR) catalytic activity and excellent cycling stability. Compared to the current density value (@ 0.8&#xa0;V) of the porous Ni<sub>p</sub>, the values of the Ni<sub>6</sub>MnFeCoCu and optimized Ni<sub>6</sub>MnFeCoCu-Se<sub>350</sub> increased by 13.3% and 30.4% for methanol oxidation, respectively. After a chrono-current test of 10,800&#xa0;s, the current density of the electrode was retained at 92.2% of its original values. These findings provide a strategic pathway for designing lightweight, efficient, and durable multi-metal catalytic electrodes for sustainable energy applications.</p> Graphical Abstract <p></p>

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Biomorphic Porous Nickel-Based Multialloy Foils: Multi-metal Incorporation and Selenization-Driven Phase and Microstructure Evolution for Enhanced Methanol Electro-oxidation Catalysis

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Guangya Hou,
  • Wei Li,
  • Guoliang Fang,
  • Jianli Zhang,
  • Qiang Chen,
  • Yiping Tang

摘要

The development of nickel-based multi-alloy catalytic electrodes for methanol oxidation reactions (MOR) holds significant potential for advancing new energy technologies. The study fabricated a biomorphic Ni6MnFeCoCu multi-element porous alloy foil via filter paper template-assisted impregnation and carbonization–reduction. The effect of selenization treatment on the phase composition, microstructure, and MOR performance of Ni6MnFeCoCu has been investigated. The results showed that biomorphic nickel-based multialloy foils inherited the porous fibers structure of the filter paper template. The main phase of Ni6MnFeCoCu are a face-centered cubic multi-element metallic phase and MnO phase. With increasing selenization temperature, the large particles on the surface of the fiber struts gradually presented; Ni in Ni6MnFeCoCu preferentially form NiSe2 with Se, followed by Cu and Fe, resulting in the formation of biphasic nickel selenide (NiSe2 and Ni3Se4), Cu2−xSe, and Cu0.41Fe0.60Se1.99 at 400 ℃. The locally controlled charge, attributed to the synergistic effect of multi-metals and the incorporation of Se, enabled the optimized Ni6MnFeCoCu-Se350 catalytic electrode to exhibit high methanol oxidation reaction (MOR) catalytic activity and excellent cycling stability. Compared to the current density value (@ 0.8 V) of the porous Nip, the values of the Ni6MnFeCoCu and optimized Ni6MnFeCoCu-Se350 increased by 13.3% and 30.4% for methanol oxidation, respectively. After a chrono-current test of 10,800 s, the current density of the electrode was retained at 92.2% of its original values. These findings provide a strategic pathway for designing lightweight, efficient, and durable multi-metal catalytic electrodes for sustainable energy applications.

Graphical Abstract