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Nano Research

Article Title

Pd-Ag alloy hollow nanostructures with interatomic charge polarization for enhanced electrocatalytic formic acid oxidation

Authors

Dong Liu, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Maolin Xie, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Chengming Wang, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Lingwen Liao, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230021, China
Lu Qiu, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Jun Ma, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Hao Huang, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Ran Long, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Jun Jiang, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
Yujie Xiong, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS), and School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China

Keywords

palladium, silver, electrocatalysis, formic acid oxidation, hollow nanostructures

Abstract

Formic acid oxidation is an important electrocatalytic reaction in protonexchangemembrane (PEM) fuel cells, in which both active sites and speciesadsorption/activation play key roles. In this study, we have developed hollowPd-Ag alloy nanostructures with high active surface areas for application toelectrocatalytic formic acid oxidation. When a certain amount of Ag is incorporatedinto a Pd lattice, which is already a highly active material for formic acidoxidation, the electrocatalytic activity can be significantly boosted. As indicatedby theoretical simulations, coupling between Pd and Ag induces polarizationcharges on Pd catalytic sites, which can enhance the adsorption of HCOO*species. As a result, the designed electrocatalysts can achieve reduced Pd usageand enhanced catalytic properties at the same time. This study represents anapproach that simultaneously fabricates hollow structures to increase the numberof active sites and utilizes interatomic interactions to tune species adsorption/activation towards improved electrocatalytic performance.

Graphical Abstract

Publisher

Tsinghua University Press

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