3D dealloyed nanoporous metals have emerged as a new class of catalysts for various chemical and electrochemical reactions. Similar to other heterogeneous catalysts, the surface atomic structure of the nanoporous metal catalysts plays a crucial role in catalytic activity and selectivity. Through surfactant‐assisted bottom‐up synthesis, the surface‐structure modification has been successfully realized in low‐dimensional particulate catalysts. However, the surface modification by top‐down dealloying has not been well explored for nanoporous metal catalysts. Here, a surfactant‐free approach to tailor the surface structure of nanoporous gold by surface relaxation via electrochemical redox cycling is reported. By controlling the scan rates, nanoporous gold with abundant {111} facets or {100} facets can be designed and fabricated with dramatically improved electrocatalysis toward the ethanol oxidation reaction.

中文翻译：

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通过无表面活性剂的电化学势循环调整3D纳米多孔金的表面结构

3D脱合金纳米多孔金属已成为用于各种化学和电化学反应的新型催化剂。类似于其他非均相催化剂，纳米孔金属催化剂的表面原子结构在催化活性和选择性中起着至关重要的作用。通过表面活性剂辅助的自下而上的合成，已经成功地在低维颗粒催化剂中实现了表面结构的改性。但是，对于纳米多孔金属催化剂，尚未通过自上而下的脱合金处理对表面进行改性。此处报道了一种无表面活性剂的方法，可通过电化学氧化还原循环通过表面弛豫来调整纳米多孔金的表面结构。通过控制扫描速率，