Enhanced Hydrazine Electrooxidation Using Ni–Zr/Multiwalled Carbon Nanotube Nanocomposites as Low‐Cost Anode Catalysts

In this work, Ni–Zr nanoparticles supported on multiwalled carbon nanotubes (MWCNTs) were synthesized via a wet chemical method, and four different Ni–Zr/MWCNT compositions were systematically prepared to investigate composition‐dependent electrocatalytic behavior. Structural and morphological characterizations using X‐ray diffraction, field‐emission scanning electron microscopy, and energy‐dispersive spectroscopy confirmed the successful incorporation of Zr into the Ni/MWCNT framework and the uniform dispersion of nanoparticles. Electrochemical studies revealed that the Ni–Zr/MWCNT system demonstrated markedly superior electrocatalytic performance compared to monometallic Ni/MWCNT. In particular, the Ni ₅₀ Zr ₅₀ /MWCNT composition exhibited the highest activity, delivering a current density of 96.35 mA.cm ⁻² with a low apparent activation energy ( E _a = 7.05 kJ.mol ⁻¹ ), a minimal charge transfer resistance ( R _ct = 24.89 ohms), and stable chronoamperometric response. The results demonstrate that synergistic alloying and conductive MWCNT support effectively enhance reaction kinetics, providing a cost‐effective and durable anode catalyst for advanced hydrazine electrooxidation.