Atomic Scaled Depth Correlation to the Oxygen Reduction Reaction Performance of Single Atom Ni Alloy to the NiO2 Supported Pd Nanocrystal
Journal
Advanced Science
Journal Volume
10
Journal Issue
11
ISSN
21983844
Date Issued
2023
Author(s)
Li, Haolin
Dai, Sheng
Wu, Yawei
Dong, Qi
Chen, Jianjun
Chen, Hsin-Yi Tiffany
Hu, Alice
Chen, Tsan-Yao
Abstract
This study demonstrates the intercalation of single-atom Ni (NiSA) substantially reduces the reaction activity of Ni oxide supported Pd nanoparticle (NiO2/Pd) in the oxygen reduction reaction (ORR). The results indicate the transition states kinetically consolidate the adsorption energy for the chemisorbed O and OH- species on the ORR activity. Notably, the NiO2/Ni1/Pd performs the optimum ORR behavior with the lowest barrier of 0.49 eV and moderate second-step barrier of 0.30 eV consequently confirming its utmost ORR performance. Through the stepwise cross-level demonstrations, a structure–Eads–ΔE correspondence for the proposed NiO2/Nin/Pd systems is established. Most importantly, such a correspondence reveals that the electronic structure of heterogeneous catalysts can be significantly differed by the segregation of atomic clusters in different dimensions and locations. Besides, the doping-depth effect exploration of the NiSA in the NiO2/Pd structure intrinsically elucidates that the Ni atom doping in the subsurface induces the most fruitful NiSA/PdML synergy combining the electronic and strain effects to optimize the ORR, whereas this desired synergy diminishes at high Pd coverages. Overall, the results not only rationalize the variation in the redox properties but most importantly provides a precision evaluation of the process window for optimizing the configuration and composition of bimetallic catalysts in practical experiments. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.
Subjects
bimetallic catalysts
DFT calculations
fuel cell
oxygen reduction reaction
Publisher
John Wiley and Sons Inc
Description
Article number 2207109
Type
journal article