Sun Jiameng, Yu Bin, Yan Xuejiao, Wang Jianfeng, Tan Fuquan, Yang Wanfeng, Cheng Guanhua, Zhang Zhonghua
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China.
Taian Institute of Supervision & Inspection on Product Quality, Taian 271000, China.
Materials (Basel). 2022 Oct 4;15(19):6892. doi: 10.3390/ma15196892.
Ag-Zn alloys are identified as highly active and selective electrocatalysts for CO reduction reaction (CORR), while how the phase composition of the alloy affects the catalytic performances has not been systematically studied yet. In this study, we fabricated a series of Ag-Zn alloy catalysts by magnetron co-sputtering and further explored their activity and selectivity towards CO electroreduction in an aqueous KHCO electrolyte. The different Ag-Zn alloys involve one or more phases of Ag, AgZn, AgZn, AgZn and Zn. For all the catalysts, CO is the main product, likely due to the weak CO binding energy on the catalyst surface. The AgZn and AgZn catalysts show a higher CO selectivity than that of pure Zn due to the synergistic effect of Ag and Zn, while the pure Ag catalyst exhibits the highest CO selectivity. Zn alloying improves the catalytic activity and reaction kinetics of CORR, and the AgZn catalyst shows the highest apparent electrocatalytic activity. This work found that the activity and selectivity of CORR are highly dependent on the element concentrations and phase compositions, which is inspiring to explore Ag-Zn alloy catalysts with promising CORR properties.
银锌合金被认为是用于CO还原反应（CORR）的高活性和选择性电催化剂，然而合金的相组成如何影响催化性能尚未得到系统研究。在本研究中，我们通过磁控共溅射制备了一系列银锌合金催化剂，并进一步探索了它们在KHCO水性电解质中对CO电还原的活性和选择性。不同的银锌合金包含Ag、AgZn、AgZn、AgZn和Zn中的一种或多种相。对于所有催化剂，CO是主要产物，这可能是由于CO在催化剂表面的结合能较弱。由于Ag和Zn的协同作用，AgZn和AgZn催化剂显示出比纯Zn更高的CO选择性，而纯Ag催化剂表现出最高的CO选择性。Zn合金化提高了CORR的催化活性和反应动力学，并且AgZn催化剂显示出最高的表观电催化活性。这项工作发现CORR的活性和选择性高度依赖于元素浓度和相组成，这对于探索具有良好CORR性能的银锌合金催化剂具有启发性。
