We demonstrate an electrodeposition process for the fabrication of highly porous PtCu alloy anodes. In the fabrication process, Pt and different amounts of a second noble metal (Pd, Ru, Au) are repeatedly co‐deposited with Cu from an aqueous electrolyte, followed by selective dealloying of Cu. In this way, highly porous PtCu alloys with roughness factors ranging from 400 to 4000 can be obtained. In all cases, both noble‐metal partners are present on the electrode surface, whereas the majority of copper is likely buried underneath. In addition, we can show that H desorption and CO stripping yield substantially different roughness factors, even when applied to PtCu anodes. Hence, when using or comparing results from different stripping methods, a calibration is required. Compared to PtCu anodes, small additions of Ru (ca. 3 at% Ru) lead to significantly enhanced catalytic activity for the electro‐oxidation of formic acid and methanol, whereas Au‐rich PtCu−Au alloys (ca. 75 at% Au) exhibit significantly improved electrocatalytic activity for glucose oxidation. In some cases, large variations impede the identification of significant differences in electrocatalytic activity. To reduce process variability and to increase the specific surface area, further optimization of the fabrication process is required. Similarly, the deposition of defined alloy compositions will require further investigation, as the composition of electrolyte and deposited alloy do not directly correspond.

中文翻译：

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用于甲醇，甲酸和葡萄糖燃料电池的高多孔Pt合金的脉冲电沉积

我们演示了用于制造高度多孔的PtCu合金阳极的电沉积工艺。在制造过程中，将Pt和不同量的第二种贵金属（Pd，Ru，Au）与铜从含水电解质中反复共沉积，然后进行选择性的铜脱合金处理。以此方式，可以获得粗糙度系数为400至4000的高度多孔的PtCu合金。在所有情况下，两种贵金属伙伴都存在于电极表面，而大多数铜很可能埋在下面。此外，我们可以证明，即使应用于PtCu阳极，H解吸和CO汽提也会产生明显不同的粗糙度因子。因此，当使用或比较不同剥离方法的结果时，需要进行校准。与PtCu阳极相比，少量的Ru（ca. 3 at％Ru）导致甲酸和甲醇电氧化的催化活性大大增强，而富Au的PtCu-Au合金（约75 at％Au）对葡萄糖氧化的电催化活性显着提高。在某些情况下，较大的变化会阻碍对电催化活性显着差异的鉴定。为了减小工艺可变性并增加比表面积，需要进一步优化制造工艺。类似地，由于电解质和沉积的合金的成分不直接对应，因此需要进一步研究确定的合金成分的沉积。75at％的Au）表现出对葡萄糖氧化的显着改善的电催化活性。在某些情况下，较大的变化会阻碍对电催化活性显着差异的鉴定。为了减小工艺可变性并增加比表面积，需要进一步优化制造工艺。类似地，由于电解质和沉积的合金的成分不直接对应，因此需要进一步研究确定的合金成分的沉积。75at％的Au）表现出对葡萄糖氧化的显着改善的电催化活性。在某些情况下，较大的变化会阻碍对电催化活性显着差异的鉴定。为了减小工艺可变性并增加比表面积，需要进一步优化制造工艺。类似地，由于电解质和沉积的合金的成分不直接对应，因此需要进一步研究确定的合金成分的沉积。