Adv. Mater.: Mesoporous PdAg Nanospheres for Stable Electrochemical CO2 Reduction to Formate

Title：

Mesoporous PdAg Nanospheres for Stable Electrochemical CO₂ Reduction to Formate

Authors：

Yuan Zhou,¹ Rui Zhou,¹ Xiaorong Zhu,² Na Han,¹ Bin Song,¹ Tongchao Liu,³ Guangzhi Hu,⁴ Yafei Li,² Jun Lu,*^,1and Yanguang Li*^,1

Institutions：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional  Materials and Devices Soochow University Suzhou 215123, China

²College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China 

³Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.

⁴Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650504, China

Abstract：

Palladium is a promising material for electrochemical CO₂reduction to formate with high Faradaic efficiency near the equilibrium potential. It unfortunately suffers from problematic operation stability due to CO poisoning on surface. Here, it is demonstrated that alloying is an effective strategy to alleviate this problem. Mesoporous PdAg nanospheres with uniform size and composition are prepared from the co-reduction of palladium and silver precursors in aqueous solution using dioctadecyldimethylammonium chloride as the structure-directing agent. The best candidate can initiate CO₂ reduction at zero overpotential and achieve high formate selectivity close to 100% and great stability even at <-0.2 V versus reversible hydrogen electrode. The high selectivity and stability are believed to result from the electronic coupling between Pd and Ag, which lowers the d-band center of Pd and there by significantly enhances its CO tolerance, as evidenced by both electrochemical analysis and theoretical simulations.

IF：

25.809

Link：

https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202000992

Editor: Danting Xiang