Enhancing the inherent catalytic activity and stability of TiO2 supported Pt single-atoms at CeOx–TiO2 interfaces

Yoo, Mi; Kang, Eunji; Choi, Hyuk; Ha, Hyunwoo; Choi, Hanseul; Choi, Jin-Seok; Lee, Kug-Seung; Celestre, Richard; Shapiro, David A.; Park, Jeong Young; Kim, Chunjoong; Yu, Young-Sang; Kim, Hyun You

doi:10.1039/d1ta08059h

Title: Enhancing the inherent catalytic activity and stability of TiO₂ supported Pt single-atoms at CeO_x–TiO₂ interfaces

Journal Article · Tue Oct 12 00:00:00 EDT 2021 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/d1ta08059h· OSTI ID:1960384

^[1]; Kang, Eunji ^[1]; Choi, Hyuk ^[1];

^[1]; Choi, Hanseul ^[2]; Choi, Jin-Seok ^[3];

^[4]; Celestre, Richard ^[5]; Shapiro, David A. ^[5];

^[2]; Kim, Chunjoong ^[1]; Yu, Young-Sang ^[6];

^[1]

Chungnam National Univ., Daejeon (Korea, Republic of)
Institute for Basic Science, Daejeon (Korea, Republic of); Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
Pohang Accelerator Lab. (PAL) (Korea, Republic of); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Chungbuk National University, Cheongju (Korea, Republic of)

Single-atoms (SAs) with atomically coordinated reaction centers are considered the next generation of catalysts that can exhibit exceptional catalytic efficiency. However, the general concern about thermodynamic vulnerabilities of SAs questions their practical value. Moreover, whether the inherent catalytic nature of SAs is superior compared with that of larger nanoparticles is still under debate. Here, we address two controversies by a comparative study using two catalysts: Pt/TiO₂ and Pt/CeO_x–TiO₂. Based on a hierarchical study of density functional theory, time-resolved catalysis performance test, in situ infrared spectroscopy, and operando X-ray absorption spectroscopy, we could unveil the catalytic nature of Pt-SAs and their stability. By utilizing the heterogeneous interface formed between TiO₂ supporting particles and CeO_x clusters formed on the surface of TiO₂, we preferentially synthesized Pt-SAs pinned at the CeO_x–TiO₂ interfaces on CeO_x–TiO₂ hybrid-oxide supports. The strong electronic coupling between the Pt-SAs and the Ce ions at the CeO_x–TiO₂ interfaces enhanced the catalytic activity toward CO oxidation of Pt-SAs and improved the long-term stability under CO oxidation conditions. The CO oxidation activity of Pt-SAs stabilized at CeO_x–TiO₂ was improved by 13.5 times at 200 °C compared with the Pt-SAs on TiO₂. The results present how to easily improve the activity and stability of Pt-SAs using a simple interface control method. Moreover, we demonstrate that the catalytic activity and the stability of Pt-SAs can be monitored through the chemical state of the interfaces. Finally, our study provides comprehensive understanding about the catalytic nature as well as a novel strategy toward applications of Pt-SAs, enabling sustainable use of Pt in heterogeneous catalysts.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Research Foundation of Korea (NRF); Institute for Basic Science (IBS); USDOE

Grant/Contract Number:: AC02-05CH11231; SC0012704; 2019R1A2C1089256; 2021R1A6A1A03043682; 2017M3D1A1039561; 2019M3D1A1079309; IBS-R004

OSTI ID:: 1960384

Alternate ID(s):: OSTI ID: 1827487

Journal Information:: Journal of Materials Chemistry. A, Vol. 10, Issue 11; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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