Issue 48, 2020

Mesoporous PdAgIr nanoalloys to catalyze formate oxidation with an unprecedentedly low onset potential

Abstract

Developing efficient catalysts with a low onset potential and exceptional stability toward the formate oxidation reaction (FOR) is highly crucial for practical scale-up of direct formate fuel cells, but still remains a formidable challenge. Herein, density functional theory calculations are first employed to investigate a PdAgIr nanoalloy and provide general guidance for designing advanced FOR catalysts. The theoretical thermodynamic analysis of the reaction energetics reveals that the incorporation of Ir into PdAg is capable of finely tuning the electronic structure of the PdAgIr(111) surface with a diminished energy barrier of 0.51 eV for the rate-determining step of the FOR, which then facilitates the quick dissociation of formate at an early anodic potential. Consistent with theoretical trends, the prepared PdAgIr nanoflower (PdAgIr NF) catalyst with ordered mesoporous architecture exhibits a record-low onset potential at 0.289 V and a superbly high mass activity of 4.36 A mgPd−1 toward the FOR benefitting from the unique functionality of Ir atoms, remarkably surpassing those of its Pd NF counterpart (0.558 V and 1.13 A mgPd−1). More surprisingly, for the first time, such a PdAgIr NF catalyst shows an unexpectedly wide oxidation current density platform for the FOR which has not ever been observed, suggesting its great potential for industrial applications.

Graphical abstract: Mesoporous PdAgIr nanoalloys to catalyze formate oxidation with an unprecedentedly low onset potential

Supplementary files

Article information

Article type
Paper
Submitted
16 اکتوٗبر 2020
Accepted
23 نومبر 2020
First published
23 نومبر 2020

J. Mater. Chem. A, 2020,8, 25780-25790

Mesoporous PdAgIr nanoalloys to catalyze formate oxidation with an unprecedentedly low onset potential

Y. Jin, F. Chen, T. Jin, L. Guo and J. Wang, J. Mater. Chem. A, 2020, 8, 25780 DOI: 10.1039/D0TA10118D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements