Energy Systems Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
Nano Lett. 2013 Sep 11;13(9):4182-9. doi: 10.1021/nl401833p. Epub 2013 Aug 14.
In this study, atomic layer deposition (ALD) was used to deposit nanostructured palladium on porous carbon as the cathode material for Li-O2 cells. Scanning transmission electron microscopy showed discrete crystalline nanoparticles decorating the surface of the porous carbon support, where the size could be controlled in the range of 2-8 nm and depended on the number of Pd ALD cycles performed. X-ray absorption spectroscopy at the Pd K-edge revealed that the carbon supported Pd existed in a mixed phase of metallic palladium and palladium oxide. The conformality of ALD allowed us to uniformly disperse the Pd catalyst onto the carbon support while preserving the initial porous structure. As a result, the charging and discharging performance of the oxygen cathode in a Li-O2 cell was improved. Our results suggest that ALD is a promising technique for tailoring the surface composition and structure of nanoporous supports in energy storage devices.
在这项研究中，原子层沉积（ALD）被用于在多孔碳上沉积纳米结构的钯作为锂-氧电池的阴极材料。扫描透射电子显微镜显示离散的结晶纳米颗粒装饰在多孔碳载体的表面上，其尺寸可以控制在 2-8nm 范围内，并且取决于所进行的 Pd ALD 循环的次数。在 Pd K 边的 X 射线吸收光谱表明，碳负载的 Pd 存在于金属钯和氧化钯的混合相中。ALD 的一致性使得我们能够将 Pd 催化剂均匀地分散在碳载体上，同时保持初始的多孔结构。结果，锂-氧电池中的氧阴极的充电和放电性能得到了改善。我们的结果表明，ALD 是一种有前途的技术，可以用于调整储能设备中纳米多孔载体的表面组成和结构。
