Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 15, Pages 5867-5875Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b02011
Keywords
-
Funding
- Georgia Institute of Technology
- China Scholarship Council (CSC)
- College of Chemical Engineering of Nanjing Tech University
- ORNL's Center for Nanophase Materials Sciences, which is a U.S. Department of Energy Office of Science User Facility
Ask authors/readers for more resources
A simple strategy for developing a cost-effective and efficient Ir-based catalyst toward the oxygen evolution reaction (OER) is to construct a core-shell structure with most of the Ir atoms serving as reactive sites on the surface. However, it has been challenging to achieve a precise control over the thickness of the Ir shell from one to several atomic layers and thus optimize the OER performance. Here, we report a facile synthesis of Pd@Ir-nL (n: the number of Ir atomic layers) core-shell nanocubes with the shell thickness controlled from one to four atomic layers. Their OER activities showed a volcano-type dependence on the number of Ir atomic layers, with a maximum point corresponding to n = 3, which can be attributed to Pd-Ir intermixing, and possible ligand and/or strain effects. Owing to the better passivation for the Pd cores and the formation of a more stable phase during electrolysis, the Pd@Ir-nL nanocubes with thicker Ir overlayers exhibited greater OER durability. The Pd@Ir-nL nanocubes delivered the best activity and durability toward OER with eta as low as 245 mV at 10 mA.cm(geo)(-2) and a mass activity of 3.33 A-mg(Ir)(-1) at eta = 300 mV. Both values were much better than those of commercial Ir/C and represent the best set of data among the Ir-based core-shell OER catalysts in acidic media.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available