文献类型：期刊文献

英文题名：Preparation of oxygen vacancy-rich 3D-Ag nanosheet arrays electrodes for efficient CO2 reduction into CO through in situ oxidation-reduction

作者：Jin, Shengnan[1];Ma, Jing[1];Wei, Wei[2];Liu, Shaomin[3];Qin, Guotong[1]

第一作者：Jin, Shengnan

通讯作者：Qin, GT[1]

机构：[1]Beihang Univ, Sch Mat Sci & Engn, Shahe Campus, Beijing 102206, Peoples R China;[2]Beijing Union Univ, Coll Biochem Engn, 18 Sanqu, Beijing 100023, Peoples R China;[3]Great Bay Univ, Sch Engn, Sch Phys Sci, Dongguan 523000, Peoples R China

第一机构：Beihang Univ, Sch Mat Sci & Engn, Shahe Campus, Beijing 102206, Peoples R China

通讯机构：[1]corresponding author), Beihang Univ, Sch Mat Sci & Engn, Shahe Campus, Beijing 102206, Peoples R China.

年份：2024

卷号：348

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20241916029827);Scopus(收录号：2-s2.0-85191984100);WOS:【SCI-EXPANDED(收录号:WOS:001238580300001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 52070009, 51772031, 52000006)

语种：英文

外文关键词：In situ oxidation-reduction; Ag nanosheet array; Oxygen vacancy; CO 2 electroreduction; CO formation

摘要：Enhancing the working current density is a great challenge that limits the practical applications of the CO 2 electrochemical reduction. In this study, a facile method was developed to prepare 3D-Ag nanosheet arrays (3DAg NA) electrodes for efficient CO 2 reduction into CO through in situ oxidation-reduction. The resulting electrodes exhibited high specific surface area and abundant oxygen vacancies. 3D-Ag NA on Ag foil electrode (3DAg NA/Ag) demonstrated a significantly enhanced current density of 25.9 mA/cm 2 at -1.06 V vs. RHE in an Hcell, surpassing the performance of Ag foil, Ag nanoparticles and Ag 2 O nanoparticles electrodes. Moreover, 3DAg NA on low cost graphite (3D-Ag NA/C) showed a current density of 24.3 mA/cm 2 at a remarkble low potential of -0.96 V vs. RHE. It was found that the formation of a dense Ag 2 O layer play a critical role in the establishing the 3D-Ag NA. Furthermore, CO 2 -TPD and DFT studies revealed that the 3D-Ag NA exhibited high CO 2 adsorption capacity and low CO 2 activation energy. This study presents a promising approach for scalable electrode preparation in the electrochemical reduction of CO 2 to CO, enabling high current density and selectivity.