The strong interaction among metal components results in the change of the electronic structure (e.g. d-band energy level) of noble metal-based alloy structures which enables the increase of catalytic activity. In this paper, self-assembled ternary PtNiCu and binary PtCu alloy nanocubes are synthesized by a one-pot high-temperature chemical reduction method. The growth mechanism of the alloy is investigated. The alloy is applied to visible light-assisted electrocatalytic hydrogen production and methanol oxidation. The ternary PtNiCu alloy exhibits superior catalytic performance (a minimum over potential of 15 mV at a current density of 10 mA cm⁻², a Tafel slope of 24.1 mV/dec, and more excellent mass specific activity under visible light irradiation about 3.3 A mg_Pt⁻¹), because of its regular morphology, more surface active sites, and more intense interaction between metal elements. Especially the localized surface plasmon resonance effect of Cu largely increases the electron density (photoelectric effect) on Pt under illumination, thereby further improves the photo-assisted hydrogen production and methanol catalytic oxidation performance. The results will promote efficient and accurate electrocatalysis process, paving new way for a brighter further in rational design of ternary plasmonic electrocatalysts and photoelectrocatalysis field.

金属成分之间的强相互作用导致贵金属基合金结构的电子结构（例如d带能级）发生变化，从而可以提高催化活性。本文采用一锅高温化学还原法合成了自组装三元PtNiCu和二元PtCu合金纳米晶。研究了合金的生长机理。该合金可用于可见光辅助电催化制氢和甲醇氧化。三元PtNiCu合金表现出优异的催化性能（在10 mA cm ^-2的电流密度下最小过电位为15 mV ，Tafel斜率为24.1 mV / dec，在约3.3 A mg的可见光照射下具有更优异的质量比活度_铂^-1），因为其规则的形态，更多的表面活性位点，以及金属元素之间更紧密的相互作用。尤其是，Cu的局部表面等离子体激元共振效应大大提高了在光照下对Pt的电子密度（光电效应），从而进一步提高了光助氢的产生和甲醇催化氧化性能。结果将促进高效，准确的电催化过程，为合理设计三元等离激元电催化剂和光电催化领域开辟新的途径。