Ultra-small, pristine nanoalloy particles have attracted considerable attention for applications ranging from electrocatalysis to electrochemical energy storage owing to their high conductivity and large specific surface area. However, their practical deployment relies on a controllable process is low-cost, scalable, and results in numerous monodispersed particles. In this work, we demonstrate an alcohothermal process that is scalable to obtain ultra-small (r < 4 nm) and monodispersed (~4.1 ± 0.5 nm) Cu–Ni nanoalloy particles. Ethylene-glycol was used as a reaction medium that also acts as an in situ reducing and capping agent responsible for nanoalloy formation. The prepared nanoalloy particles were electrochemically tested for supercapacitor and methanol-oxidation applications. The nanoalloy electrode showed a desirable specific capacitance of 858F g⁻¹ at a current density of 1 Ag⁻¹ with good cyclic stability. As a catalyst for methanol-oxidation, the nanoalloy showed a high current density of ~191.5 mA cm⁻². The methanol-oxidation reaction current reached 156 mA while maintaining 83% of its initial value, even after 300 cycles. The observed superior electrochemical performance is attributed to the high conductivity, fast electron transport, and large specific surface associated with ultra-small Cu-Ni nanoalloy particles.

由于其高电导率和大比表面积，超小、原始的纳米合金颗粒在从电催化到电化学储能的应用中引起了相当大的关注。然而，它们的实际部署依赖于低成本、可扩展的可控过程，并导致大量单分散颗粒。在这项工作中，我们展示了一种可扩展以获得超小 (r < 4 nm) 和单分散 (~4.1 ± 0.5 nm) Cu-Ni 纳米合金颗粒的醇热工艺。乙二醇被用作反应介质，它也充当负责纳米合金形成的原位还原剂和封端剂。对制备的纳米合金颗粒进行电化学测试，用于超级电容器和甲醇氧化应用。^-1在电流密度为 1 Ag ^{-1 时}具有良好的循环稳定性。作为甲醇氧化的催化剂，纳米合金显示出~191.5 mA cm ^-2的高电流密度。甲醇氧化反应电流达到 156 mA，同时保持其初始值的 83%，即使在 300 次循环后也是如此。观察到的优异电化学性能归因于与超小 Cu-Ni 纳米合金颗粒相关的高电导率、快速电子传输和大比表面积。