Activation of subnanometric Pt on Cu-modified CeO2 via redox-coupled atomic layer deposition for CO oxidation

Xiao Liu, Shuangfeng Jia, Ming Yang, Yuanting Tang, Yanwei Wen, Shengqi Chu, Jianbo Wang, Bin Shan () and Rong Chen ()
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Xiao Liu: Huazhong University of Science and Technology
Shuangfeng Jia: Wuhan University
Ming Yang: Chemical Sciences and Materials Systems Lab
Yuanting Tang: Huazhong University of Science and Technology
Yanwei Wen: Huazhong University of Science and Technology
Shengqi Chu: Chinese Academy of Sciences
Jianbo Wang: Wuhan University
Bin Shan: Huazhong University of Science and Technology
Rong Chen: Huazhong University of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Improving the low-temperature activity (below 100 °C) and noble-metal efficiency of automotive exhaust catalysts has been a continuous effort to eliminate cold-start emissions, yet great challenges remain. Here we report a strategy to activate the low-temperature performance of Pt catalysts on Cu-modified CeO2 supports based on redox-coupled atomic layer deposition. The interfacial reducibility and structure of composite catalysts have been precisely tuned by oxide doping and accurate control of Pt size. Cu-modified CeO2-supported Pt sub-nanoclusters demonstrate a remarkable performance with an onset of CO oxidation reactivity below room temperature, which is one order of magnitude more active than atomically-dispersed Pt catalysts. The Cu-O-Ce site with activated lattice oxygen anchors deposited Pt sub-nanoclusters, leading to a moderate CO adsorption strength at the interface that facilitates the low-temperature CO oxidation performance.

Date: 2020
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DOI: 10.1038/s41467-020-18076-6

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