4.8 Article

Solution Plasma Processing Single-Atom Au1 on CeO2 Nanosheet for Low Temperature Photo-Enhanced Mars-van Krevelen CO Oxidation

期刊

ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 48, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202207694

关键词

CO oxidation; photo-enhanced Mars-van Krevelen; single-atom catalysts; solution plasma processing

资金

  1. Natural Science Foundation of China [91833303, 51072032, 51102001, 51872044]
  2. Jilin Province Science and Technology Development Project [20180101175JC]
  3. 111 Project [B13013]
  4. Jilin Provincial Education Department Project [JJKH20201162KJ]
  5. Fundamental Research Funds for the Central Universities [2412019FZ039]

向作者/读者索取更多资源

A solution plasma process (SPP) is developed to achieve nearly 100% trapping of single atom metals and create oxygen vacancies on CeO2. The Au-1/CeO2 catalyst shows efficient CO oxidation at room temperature with the assistance of solar light.
Creating oxygen vacancies in metal oxide support holds promise in anchoring and stabilizing single atom metals, activating the lattice oxygen of metal oxide and accelerating Mars-van Krevelen (MvK) catalytic oxidation. However, it is challenging to achieve nearly 100% trapping of single atom metal in solution by oxygen vacancy typed metal oxide, resulting from the difficulty in synchronized formation of oxygen vacancies and capture of the single atom metal. In this work, a solution plasma process (SPP) is developed, enabling approximate to 99% trapping of single atom Au by using oxygen vacancy typed CeO2 nanosheet in 2 min. Owing to the large number of electrons and free radicals present in the plasma region, the SPP can simultaneously reduce HAuCl4 to single-atom Au and bring oxygen vacancies as anchoring sites onto CeO2. The catalytic test of CO oxidation assisted by solar light can reach a conversion of 91.7% with a high turnover frequency of 1.3 s(-1) at room temperature, far exceeding the requirements for the 150 degrees C challenge. A photo-enhanced MvK pathway is proposed for the superior performance of Au-1/CeO2. This work not only explores a novel solution approach to prepare single-atom metal catalysts, but also provides an effective strategy for efficient low-temperature catalytic oxidation.

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