A perovskite-type oxide (LaNi_0.6Fe_0.4O₃-CeO₂, LNF-C) and multiwalled carbon nanotube (MWCNT) composite was employed as a novel catalyst material for the electrochemical oxidation of urea in an amperometric urea sensor. The structural and morphological properties of the LNF-C/MWCNT nanocomposite were studied by X-ray diffraction and scanning electron microscopy. The Ni-based pervoskite exhibited higher electrocatalytic activity than a single NiO compound, and CeO₂ further improved the activity and stability. The reaction of urea electrooxidation on LNF-C occurred via 6-electrons, and was a half-order reaction with respect to urea concentrations in alkaline solution, as observed by cyclic voltammetry studies. The LNF-C/MWCNT modified electrodes exhibited a sensitivity of 195.6 μAmM⁻¹ cm⁻² in a linear range from 25 to 670 μM of urea with a low detection limit (1 μM), fast response time (5 s), and good stability. In addition, the urea sensor demonstrated feasibility for urea analysis in real urine samples. The results indicated that the LNF-C/MWCNT composite could be used as an effient catalyst for the electro-oxidation of urea and electrode material for non-enzymatic urea sensors.

钙钛矿型氧化物（LaNi _0.6 Fe _0.4 O ₃ -CeO ₂，LNF-C）和多壁碳纳米管（MWCNT）复合材料被用作新颖的催化剂材料，用于安培尿素传感器中尿素的电化学氧化。通过X射线衍射和扫描电子显微镜研究了LNF-C / MWCNT纳米复合材料的结构和形态特性。镍基白云母比单一的NiO化合物和CeO ₂具有更高的电催化活性进一步提高了活性和稳定性。循环伏安法研究表明，尿素在LNF-C上的电氧化反应是通过6个电子发生的，相对于碱性溶液中尿素的浓度而言，这是一个半阶反应。LNF-C / MWCNT修饰电极在尿素的25至670μM线性范围内表现出195.6μAmM ^-1  cm ^-2的灵敏度，检测限低（1μM），响应时间短（5 s），且灵敏度高稳定。此外，尿素传感器证明了在实际尿液样品中进行尿素分析的可行性。结果表明，LNF-C / MWCNT复合材料可作为尿素电氧化的有效催化剂和非酶尿素传感器的电极材料。