Atomically dispersed Au anchored on CeO2to enhancing the antioxidant activity

Zhimin Guo; Jie Zhang; Yangkai Luo; Dongxiao Li; Ruihuan Zhao; Yubiao Huang; Hao Ren; Xin Yao

doi:10.1088/1361-6528/acc9ca

Atomically dispersed Au anchored on CeO₂to enhancing the antioxidant activity

Nanotechnology. 2023 Apr 28;34(28). doi: 10.1088/1361-6528/acc9ca.

Authors

Zhimin Guo¹, Jie Zhang¹, Yangkai Luo¹, Dongxiao Li¹, Ruihuan Zhao¹, Yubiao Huang¹, Hao Ren¹, Xin Yao¹

Affiliation

¹ School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

PMID: 37114843
DOI: 10.1088/1361-6528/acc9ca

Abstract

The modification of Au nanoparticles can improve the antioxidant activity of CeO₂, however, nano Au/CeO₂has also met some problems such as low atomic utilization, the limit of reaction conditions, and high cost. Au single atom catalysts can well solve the above-mentioned problems, but there are some contradictory results about the activity of single atom Au₁/CeO₂and nano Au/CeO₂. Here, we synthesized rod-like Au single atom Au/CeO₂(0.4% Au₁/CeO₂) and nano Au/CeO₂(1% Au/CeO₂, 2% Au/CeO₂and 4% Au/CeO₂), and their antioxidant activity from strong to weak is 0.4% Au₁/CeO₂, 1% Au/CeO₂, 2% Au/CeO₂and 4% Au/CeO₂, respectively. The higher antioxidant activity of 0.4% Au₁/CeO₂is mainly due to the high Au atomic utilization ratio and the stronger charge transfer between Au single atoms and CeO₂, resulting in the higher content of Ce³⁺. Due to the coexistence of Au single atoms and Au NPs in 2% Au/CeO₂, the antioxidant activity 2% Au/CeO₂is higher than that of 4% Au/CeO₂. And the enhancement effect of Au single atoms was not affected by the concentration of ·OH and material concentration. These results can promote the understanding of the antioxidant activity of 0.4% Au₁/CeO₂and promote its application.

Keywords: Au single atom; atomic utilization; electronic transfer; valence state of Au.