Atomically Engineered WOx/MoOx-Modified Defect-Rich Pd Metallene for Enhanced Alkaline Oxygen Reduction Electrocatalysis

17 April 2024, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Defect engineering is a key chemical tool to modulate the electronic structure and reactivity of nanostructured catalysts. Here, we report how engineering defects in a palladium metallene nanostructure results in a highly active catalyst for the alkaline oxygen reduction reaction (ORR). A defect-rich WOx and MoOx modified Pd metallene (denoted as D-Pd M) was synthesized by a facile wet-chemical method. Detailed structural analyses reveal the presence of three distinct atomic-scale defects, that is pores, concave surfaces, and surface-anchored individual WOx and MoOx sites. The presence of this combination of defects results in excellent catalytic ORR activity with a half-wave potential of 0.93 V vs. RHE and a mass activity of 1.3 A·mgPd-1 at 0.9 V vs. RHE, outperforming the commercial references Pt/C and Pd/C by factors of 6.5 and 3.9, respectively. The practical usage of the compound is demonstrated by integration into a custom-designed Zn-air battery. At notably low D-Pd M loading (26 μgPd·cm-2), the system achieves a high specific capacity (809 mAh·gZn-1) together with excellent discharge potential stability. In sum, this study provides a blueprint for the targeted introduction of distinct defect sites into metallene ORR catalysts, leading to materials with outstanding performance metrics.


Oxygen reduction reaction
Atomic WOx/MoOx modification

Supplementary materials

Supplementary Information
The supplementary information contains supporting experimental procedures, characterizations, electrochemical measurements, computational details, Zn-air battery meansurement details, supplementary figures, and author contributions.


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.