Key chemical transformations require metal and redox sites in proximity at interfaces; however, in traditional oxide-supported materials, this requirement is met only at the perimeters of metal nanoparticles. We report that galvanic replacement can produce inverse FeO_x/metal nanostructures in which the concentration of oxide species adjoining metal domains is maximal. The synthesis involves reductive deposition of rhodium or platinum and oxidation of Fe²⁺ from magnetite (Fe₃O₄). We discovered a parallel dissolution and adsorption of Fe²⁺ onto the metal, yielding inverse FeO_x-coated metal nanoparticles. This nanostructure exhibits the intrinsic activity in selective CO₂ reduction that simple metal nanoparticles have only at interfaces with the support. By enabling a simple way to control the surface functionality of metal particles, our approach is not only scalable but also enables a versatile palette for catalyst design.

关键的化学转化需要在界面附近形成金属和氧化还原位点。但是，在传统的氧化物负载材料中，仅在金属纳米颗粒的周边满足此要求。我们报告说，原电池置换可以产生反FeO _x /金属纳米结构，其中毗邻金属域的氧化物种类的浓度最大。合成过程包括铑或铂的还原性沉积以及磁铁矿（Fe ₃ O ₄）中的Fe ²⁺氧化。我们发现了Fe ²⁺在金属上的平行溶解和吸附，从而产生了反FeO _x涂层的金属纳米颗粒。该纳米结构表现出选择性CO ₂的固有活性减少了简单的金属纳米颗粒仅与载体的界面。通过采用一种简单的方法来控制金属颗粒的表面功能，我们的方法不仅可扩展，而且还为催化剂设计提供了通用的调色板。