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Direct hydrazine fuel cells (DHFC) insist on the evolved and persistent electrocatalysts for anodic hydrazine oxidation reaction (HzOR). Herein, PdO promoted CuO heterostructures supported on γ-Al₂O₃ are depicted as efficient electrocatalysts for HzOR. γ-Al₂O₃ is prepared by precipitation method while metal precursors are incorporated by co-impregnation technique. Physiochemically characterized PdO-CuO/Al₂O₃ mesoporous composites displayed large electrochemical active surface area (ECSA) i. e., 0.18 cm², high current density (j) i. e., 35.7 mA cm⁻², larger diffusion coefficient (D°) i. e., 29.3×10⁻⁴ (cm²s⁻¹), large apparent rate constant (k_app) i. e., 13.2 cm⁻¹ with low charge transfer resistance (R_ct) i. e., 3.6 kΩ shown by the best catalyst i. e., 1 % PdO-CuO/Al₂O₃. Cyclic voltammetry indicated that the fabricated working electrodes offer high efficiency towards HzOR in alkaline medium in such a way that 1 % PdO-CuO/Al₂O₃ produced 600 times higher oxidation current than CuO/Al₂O₃ composite. Owing to stability and reproducibility, PdO modified CuO/Al₂O₃ would achieve a huge catalytic significance in multiple electrochemical oxidation reactions with economic and ecological benefits.