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Fraga Alvarez DV, Lin Z, Shi Z, Baxter AF, Wang ED, Kuvar D, Mahmud N, El-Naas MH, Abruña HD, Muller DA, Esposito DV. Condensed Layer Deposition of Nanoscopic TiO 2 Overlayers on High-Surface-Area Electrocatalysts. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38688003 DOI: 10.1021/acsami.3c18366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Encapsulating an electrocatalytic material with a semipermeable, nanoscopic oxide overlayer offers a promising approach to enhancing its stability, activity, and/or selectivity compared to an unencapsulated electrocatalyst. However, applying nanoscopic oxide encapsulation layers to high-surface-area electrodes such as nanoparticle-supported porous electrodes is a challenging task. This study demonstrates that the recently developed condensed layer deposition (CLD) method can be used for depositing nanoscopic (sub-10 nm thick) titanium dioxide (TiO2) overlayers onto high-surface-area platinized carbon foam electrodes. Characterization of the overlayers by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) showed that the films are amorphous, while X-ray photoelectron spectroscopy confirmed that they exhibit TiO2 stoichiometry. Electrodes were also characterized by hydrogen underpotential deposition (Hupd) and carbon monoxide (CO) stripping, demonstrating that the Pt electrocatalysts remain electrochemically active after encapsulation. Additionally, copper underpotential deposition (Cuupd) measurements revealed that TiO2 overlayers are effective at blocking Cu2+ from reaching the TiO2/Pt buried interface and were used to estimate that between 43 and 98% of Pt surface sites were encapsulated. Overall, this study shows that CLD is a promising approach for depositing nanoscopic protective overlayers on high-surface-area electrodes.
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Affiliation(s)
| | | | | | | | | | | | - Nafis Mahmud
- Gas Processing Center, Qatar University, P.O. Box 2713, Al Tarfa Street, Doha , Qatar
| | - Muftah H El-Naas
- Gas Processing Center, Qatar University, P.O. Box 2713, Al Tarfa Street, Doha , Qatar
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Ando F, Gunji T, Tanabe T, Fukano I, Abruña HD, Wu J, Ohsaka T, Matsumoto F. Enhancement of the Oxygen Reduction Reaction Activity of Pt by Tuning Its d-Band Center via Transition Metal Oxide Support Interactions. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01868] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fuma Ando
- Department of Materials and Life Chemistry, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japan
| | - Takao Gunji
- Department of Materials and Life Chemistry, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japan
| | - Toyokazu Tanabe
- Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka 239-8686, Japan
| | - Isao Fukano
- Department of Materials and Life Chemistry, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japan
| | - Héctor D. Abruña
- Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Jianfei Wu
- Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, 266101 Qingdao, China
| | - Takeo Ohsaka
- Research Institute for Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japan
| | - Futoshi Matsumoto
- Department of Materials and Life Chemistry, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japan
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