Highly coordinated Pd overlayers on nanoporous gold for efficient formic acid electro-oxidation  

作　　者：Qinqin Sang Shuai Yin Feng Liu Huiming Yin Jia He Yi Ding 

机构地区：[1]Tianjin Key Laboratory of Advanced Functional Porous Materials,Institute for New Energy Materials&Low-Carbon Technologies,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China [2]Kunming Institute of Precious Metals,Kunming 650106,China

出　　处：《Nano Research》2021年第10期3502-3508,共7页纳米研究（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51901156,52073214,and U1804255);the National Science Fund for Distinguished Young Scholars(No.51825102).

摘　　要：Design and fabrication of highly efficient and stable electrocatalysts remain key challenges in green energy technologies such as low-temperature direct liquid fuel cells.Based on in-depth theoretical calculations,here we demonstrate that surface Pd atoms with high coordination numbers(HCNs)can effectively modulate their adsorption energies for CO and OH,and thus achieve very high performance for formic acid electro-oxidation reaction(FAOR).Based on epitaxial coating Pd atomic layers onto nanoporous gold(NPG)thin membranes and a slight further decoration of Au clusters on top,the resulted core-shell structured NPG-Pd-Au electrocatalyst can demonstrate Pd intrinsic and mass activities of 8.62 mA·cm^(-2)and 27.25 A·mg^(-1)respectively at the peak potential around 0.33 V versus saturated calomel electrode toward FAOR,which are far better than those of commercial Pd/C catalysts(1.09 mA·cm^(-2)and 0.32 A·mg^(-1))tested under the same conditions.Moreover,the membrane electrode assemblies based on these low precious metal loading electrodes can achieve an anode Pd power efficiency over 10 W·mg^(-1)in a direct formic acid fuel cell,which is two orders of magnitude higher than that of the commercial Pd/C.These results provide new inspirations for the development of revolutionary electrodes for energy technologies in a rational manner.

关 键 词：PD nanoporous gold high coordination number formic acid oxidation direct formic acid fuel cell 

分 类 号：O64[理学—物理化学]