Abstract The catalytic activity of original and corroded Au54-0.7xCu28-0.3xAg18-2x(Ni2Zn)x (x = 0, 3, 6 and 9) alloys, together with their structure, hardness and morphology, are studied using various techniques. Alloying improves the hardness of the samples. There are some Ag/AgCl species on the surfaces of corroded samples. Chemical corrosion changes the surface orientation of the Au-rich solid solution, which is related to the rearrangement of Au atoms to accommodate surface defects. The surface orientation change and presence of Ag/AgCl increase the catalytic activity of the samples for the electro-oxidation of HCOOH.

中文翻译：

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化学腐蚀和合金化对 18 克拉金电氧化 HCOOH 催化活性的影响

摘要 使用各种技术研究了原始和腐蚀的 Au54-0.7xCu28-0.3xAg18-2x(Ni2Zn)x (x = 0、3、6 和 9) 合金的催化活性及其结构、硬度和形貌。合金化提高了样品的硬度。在腐蚀样品的表面上有一些 Ag/AgCl 物种。化学腐蚀改变了富金固溶体的表面取向，这与金原子的重新排列以适应表面缺陷有关。表面取向的变化和 Ag/AgCl 的存在增加了样品对 HCOOH 电氧化的催化活性。