Bimetallic Tandem Strategy for Effective Modulation of CO 2 Electrocatalytic Selectivity on Relatively Inert Cu Interfaces

作者：Yong Yan, Huan Zhou, Tongxian Li, Dong Wang, Peter Schaaf, Guangsheng Guo, Xiayan Wang · 发表于：Small · 年份：2025 · DOI：10.1002/smll.202501125 · 被引用次数：11 · 研究领域：CO2 Reduction Techniques and Catalysts、Ionic liquids properties and applications、Electrocatalysts for Energy Conversion

Abstract The development of effective strategies to enhance the activity and selectivity of Cu‐based catalysts for the CO 2 reduction reaction (CO 2 RR) remains a critical challenge, particularly on relatively inert Cu facets that are highly active in the competitive hydrogen evolution reaction (HER). In this study, a series of Cu‐M (M = Au, Ag, Pd) bimetallic tandem interfaces are fabricated on Cu nanocolumn arrays (Cu NCAs) with predominantly exposed Cu (200) facets. These interfaces excited a significant number of Cu + species and modulated the adsorption behavior of critical intermediates for CO 2 RR, resulting in improved CO 2 RR activity and a substantial reduction in the competitive HER. Notably, the Cu‐Au, Cu‐Ag, and Cu‐Pd NCAs displayed excellent selectivity for C 2 H 4 , CO, and HCOOH products, with optimized faradaic efficiency (FE) of ≈43.2, ≈48.0, and ≈50.7%, respectively. According to in situ spectroscopic analysis, each Cu‐M interface exhibited distinct catalytic pathways: Cu‐Au favored *COOH and *CO adsorption followed by C‐C coupling for C 2 H 4 production, Cu‐Ag promoted *CO desorption for CO generation, and Cu‐Pd facilitated *OCHO formation for HCOOH production. This study provides a strategy to design high‐performance and more practical bimetallic Cu‐based catalytic electrodes by directly modifying various commercial Cu substrates.