Zhu Qinggong, Yang Dexin, Liu Huizhen, Sun Xiaofu, Chen Chunjun, Bi Jiahui, Liu Jiyuan, Wu Haihong, Han Buxing
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Colloid and Interface and Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
College of Chemistry, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, China.
Angew Chem Int Ed Engl. 2020 Jun 2;59(23):8896-8901. doi: 10.1002/anie.202001216. Epub 2020 Apr 6.
Electrocatalytic reduction of CO to a single product at high current densities and efficiencies remains a challenge. However, the conventional electrode preparation methods, such as drop-casting, usually suffer from low intrinsic activity. Herein, we report a synthesis strategy for preparing heterogeneous electrocatalyst composed of 3D hierarchical Cu dendrites that derived from an in situ electrosynthesized hollow copper metal-organic framework (MOF), for which the preparation of the Cu-MOF film took only 5 min. The synthesis strategy preferentially exposes active sites, which favor's the reduction of CO to formate. The current density could be as high as 102.1 mA cm with a selectivity of 98.2 % in ionic-liquid-based electrolyte and a commonly used H-type cell.
在高电流密度和高效率下将CO电催化还原为单一产物仍然是一个挑战。然而，传统的电极制备方法，如滴铸法，通常存在固有活性低的问题。在此，我们报告了一种合成策略，用于制备由3D分级铜树枝晶组成的非均相电催化剂，该铜树枝晶源自原位电合成的中空铜金属有机框架（MOF），其Cu-MOF薄膜的制备仅需5分钟。该合成策略优先暴露活性位点，有利于将CO还原为甲酸盐。在基于离子液体的电解质和常用的H型电池中，电流密度可达102.1 mA cm，选择性为98.2%。
