CoPt_x/γ-Al₂O₃ bimetallic nanoalloys as promising catalysts for hydrazine electrooxidation

Stable bimetallic catalysts composed of CoPt_x/γ-Al₂O₃ (x = Pt/Co molar ratio) were synthesized by wet impregnation method followed by calcination and the H₂ reduction. The powders were characterized using XRD, AAS, BET, SEM, EDX, TPR, and TPO techniques. The prepared catalysts were drop casted on the glassy carbon electrode (GCE) and catalytic performance was examined for hydrazine electrooxidation in alkaline medium via cyclic voltammetry (CV). All the compositions in CoPt_x/γ-Al₂O₃ series showed high responses towards hydrazine electrooxidation, however; high activity of CoPt_0.034/γ-Al₂O₃ catalyst inferred it as a best material with an anodic peak current (i_P) response of 200 μA at 0.86 V. The prominent electrochemical (EC) responses for this composition are attributed to better accessible surface area resulting in a fast electron transfer. The CoPt_x/γ-Al₂O₃ catalysts are reported as the robust and superior prospective materials for extensive electroanalytical and catalytic studies.