Fine-Tuned Local Coordination Environment of Pt Single Atoms on Ceria Controls Catalytic Reactivity

Authors

Wei Tan
Shaohua Xie
Duy Le
Weijian Diao
Meiyu Wang
Ke-Bin Low
Dave Austin
Sampyo Hong
Fei Gao
Lin Dong
Lu Ma
Steven N Ehrlich
Talat S Rahman
Fudong Liu

Publication Date

11-18-2022

Journal

Nature Communications

Abstract

Constructing single atom catalysts with fine-tuned coordination environments can be a promising strategy to achieve satisfactory catalytic performance. Herein, via a simple calcination temperature-control strategy, CeO2 supported Pt single atom catalysts with precisely controlled coordination environments are successfully fabricated. The joint experimental and theoretical analysis reveals that the Pt single atoms on Pt1/CeO2 prepared at 550 °C (Pt/CeO2-550) are mainly located at the edge sites of CeO2 with a Pt-O coordination number of ca. 5, while those prepared at 800 °C (Pt/CeO2-800) are predominantly located at distorted Ce substitution sites on CeO2 terrace with a Pt-O coordination number of ca. 4. Pt/CeO2-550 and Pt/CeO2-800 with different Pt1-CeO2 coordination environments exhibit a reversal of activity trend in CO oxidation and NH3 oxidation due to their different privileges in reactants activation and H2O desorption, suggesting that the catalytic performance of Pt single atom catalysts in different target reactions can be maximized by optimizing their local coordination structures.

Comments

Supplementary Materials

Data Availability Statement

PMID: 36400791