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Wang Z, Jin X, Chen F, Kuang X, Min J, Duan H, Li J, Chen J. Oxygen vacancy induced interaction between Pt and TiO 2 to improve the oxygen reduction performance. J Colloid Interface Sci 2023; 650:901-912. [PMID: 37453314 DOI: 10.1016/j.jcis.2023.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 06/10/2023] [Accepted: 07/06/2023] [Indexed: 07/18/2023]
Abstract
In proton exchange membrane fuel cells (PEMFCS), a Pt-based catalyst has been plagued by activity and durability, making it difficult to implement in large-scale commercial applications. In this paper, a composite material formed by titanium dioxide and carbon black containing oxygen vacancies (TiO2(OV)-C) was used as a functional support to successfully load Pt nanoparticles (NPS). The introduction of oxygen vacancies induces the formation of a connection between Pt and TiO2, which not only strengthens the fixation of Pt by the composite support but also optimizes the local charge density of Pt. Compared with Pt/C (0.842 V) and Pt/TiO2-C (0.841 V), the half-wave potential (E1/2) of Pt/TiO2(OV)-C (0.862 V) is increased by 20 mV and 21 mV, respectively. After a long-term durability test, the E1/2 of Pt/TiO2(OV)-C is only attenuated by 5 mV. In addition, the mass activity (MA) and specific activity (SA) decreased from 183.4 mA mg-1 and 0.565 mA cm-2 to 144.4 mA mg-1 and 0.483 mA cm-2 at 0.85 V, only decreasing by 21% and 17 %, showing good stability. X-ray photoelectron spectroscopies (XPS) and density functional theory (DFT) calculations show that the interaction between Pt and TiO2 reduces the d-band center of Pt, thereby improving the desorption of intermediates *OH, which in turn promotes the activity of alkaline ORR. This study not only shows that OV plays a key role in the process of inducing interaction, but also deeply studies the influence of this interaction on the active site Pt, which provides more choices for the design of excellent multiphase catalysts.
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Affiliation(s)
- Ziyu Wang
- Key Laboratory of Solid State Physics and Devices Autonomous Region, School of Physics Science and Technology, Xinjiang University, Urumqi 830046, Xinjiang, PR China; Key Laboratory of Energy Materials Chemistry, Ministry of Education, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China
| | - Xuekun Jin
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Fengjuan Chen
- Key Laboratory of Solid State Physics and Devices Autonomous Region, School of Physics Science and Technology, Xinjiang University, Urumqi 830046, Xinjiang, PR China; Key Laboratory of Energy Materials Chemistry, Ministry of Education, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China.
| | - Xuanyu Kuang
- Key Laboratory of Solid State Physics and Devices Autonomous Region, School of Physics Science and Technology, Xinjiang University, Urumqi 830046, Xinjiang, PR China; Key Laboratory of Energy Materials Chemistry, Ministry of Education, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China
| | - Junyong Min
- Key Laboratory of Solid State Physics and Devices Autonomous Region, School of Physics Science and Technology, Xinjiang University, Urumqi 830046, Xinjiang, PR China; Key Laboratory of Energy Materials Chemistry, Ministry of Education, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China
| | - Haiming Duan
- Key Laboratory of Solid State Physics and Devices Autonomous Region, School of Physics Science and Technology, Xinjiang University, Urumqi 830046, Xinjiang, PR China; Key Laboratory of Energy Materials Chemistry, Ministry of Education, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China
| | - Junhua Li
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Jianjun Chen
- School of Environment, Tsinghua University, Beijing 100084, China.
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Antoniassi RM, Quiroz J, Barbosa ECM, Parreira LS, Isidoro RA, Spinacé EV, Silva JCM, Camargo PHC. Improving the Electrocatalytic Activities and CO Tolerance of Pt NPs by Incorporating TiO
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Nanocubes onto Carbon Supports. ChemCatChem 2021. [DOI: 10.1002/cctc.202002066] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rodolfo M. Antoniassi
- Instituto de Química (IQ) Universidade de São Paulo (USP) Cidade Universitária Av. Prof. Lineu Prestes, 748 São Paulo SP 05508-000 Brazil
| | - Jhon Quiroz
- Instituto de Química (IQ) Universidade de São Paulo (USP) Cidade Universitária Av. Prof. Lineu Prestes, 748 São Paulo SP 05508-000 Brazil
- Department of Chemistry University of Helsinki A.I. Virtasen aukio 1 Helsinki Finland
| | - Eduardo C. M. Barbosa
- Instituto de Química (IQ) Universidade de São Paulo (USP) Cidade Universitária Av. Prof. Lineu Prestes, 748 São Paulo SP 05508-000 Brazil
| | - Luanna S. Parreira
- Instituto de Química (IQ) Universidade de São Paulo (USP) Cidade Universitária Av. Prof. Lineu Prestes, 748 São Paulo SP 05508-000 Brazil
| | - Roberta A. Isidoro
- Instituto de Pesquisas Energéticas e Nucleares IPEN/CNEN-SP Cidade Universitária Av. Prof. Lineu Prestes, 2242 São Paulo SP 05508-900 Brazil
| | - Estevam V. Spinacé
- Instituto de Pesquisas Energéticas e Nucleares IPEN/CNEN-SP Cidade Universitária Av. Prof. Lineu Prestes, 2242 São Paulo SP 05508-900 Brazil
| | - Julio C. M. Silva
- Instituto de Química da Universidade Federal Fluminense Grupo de Eletroquímica e Materiais Nanoestruturados Campus Valonguinho Niterói RJ 24020-141 Brazil
| | - Pedro. H. C. Camargo
- Instituto de Química (IQ) Universidade de São Paulo (USP) Cidade Universitária Av. Prof. Lineu Prestes, 748 São Paulo SP 05508-000 Brazil
- Department of Chemistry University of Helsinki A.I. Virtasen aukio 1 Helsinki Finland
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