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<p>Abstract</p> <p>SnO₂ nanorod array grown directly on alloy substrate has been employed as the working electrode of H₂O₂ biosensor. Single-crystalline SnO₂ nanorods provide not only low isoelectric point and enough void spaces for facile horseradish peroxidase (HRP) immobilization but also numerous conductive channels for electron transport to and from current collector; thus, leading to direct electrochemistry of HRP. The nanorod array-based biosensor demonstrates high H₂O₂ sensing performance in terms of excellent sensitivity (379 &#956;A mM^&#8722;1 cm^&#8722;2), low detection limit (0.2 &#956;M) and high selectivity with the apparent Michaelis&#8211;Menten constant estimated to be as small as 33.9 &#956;M. Our work further demonstrates the advantages of ordered array architecture in electrochemical device application and sheds light on the construction of other high-performance enzymatic biosensors.</p>