Abstract The fabrication and application of bimetallic catalysts are of significance in enhanced electrocatalytic performance. In this work, sea urchin-like Pt-Cu bimetallic catalyst was synthesized by a one-pot aqueous method. The alloy was reduced and grown directly on the surface of reduced graphene oxide (RGO), which can maximize the contact/interaction between metals and RGO to achieve the enhanced catalytic activity. The transmission electron microscopy images revealed that the Pt-Cu bimetallic particles were uniformly dispersed on RGO in the shape of sea urchin-like with the size about ~ 20 nm. A hydrazine electrochemical sensor was built by modifying glassy carbon electrode with Pt-Cu/RGO nanomaterial. The electrochemical experiments showed that the proposed sensor exhibited an excellent performance for hydrazine analysis with a wide linear range of 0.4 μM-12 mM and a low detection limit of 0.13 μ M (S/N = 3). Additionally, the sensor also demonstrated a long term stability, good selectivity and repeatability.

中文翻译：

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还原氧化石墨烯纳米片上铂铜双金属催化剂的简便合成及其在电化学传感中的应用

摘要 双金属催化剂的制备和应用对于提高电催化性能具有重要意义。在这项工作中，采用一锅法合成了海胆状 Pt-Cu 双金属催化剂。该合金直接在还原氧化石墨烯 (RGO) 的表面上被还原和生长，这可以最大限度地提高金属与 RGO 之间的接触/相互作用，以实现增强的催化活性。透射电子显微镜图像显示 Pt-Cu 双金属颗粒均匀地分散在 RGO 上，呈海胆状，尺寸约为 20 nm。通过用Pt-Cu/RGO纳米材料修饰玻碳电极，构建了肼电化学传感器。电化学实验表明，所提出的传感器表现出优异的肼分析性能，线性范围为 0.4 μM-12 mM，检测限低至 0.13 μM (S/N = 3)。此外，该传感器还表现出长期稳定性、良好的选择性和可重复性。