Hydrazine is a possible human carcinogen because of its hyper toxicity. Therefore, the determination of hydrazine is particularly important for environmental protection and public security. Electrochemical method for the detection of hydrazine has drawn great interests because of its high sensitivity, fast response time, simple operation, and low cost. In this work, a leaf-like copper oxide (CuO) anchored onto wormlike ordered mesoporous carbon (OMC) composite was prepared for the construction of an electrochemical sensing platform for hydrazine. Because of the synergetic catalytic effect and unique structural properties, the obtained nanosized CuO incorporated in OMC exhibited good electrocatalytic performance for the oxidation of hydrazine with a catalytic rate constant (k(cat)) of 1.28 x 10(5) M(-1)s(-1). Moreover, the content ratio of CuO: OMC was optimized to improve the electrocatalytic performance. The CuO/OMC hybrids can act as a sensitive and effective sensing platform for the determination of hydrazine, exhibiting wide linear range, high sensitivity, low limit of detection, and good stability. This comprehensive and systematic study may provide great opportunities for the design and construction of electrochemical sensors for environmental monitoring. (C) 2019 Elsevier Inc. All rights reserved.