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Zhu R, Yu R, Yin K, Zhang S, Chung-Yen Jung J, Zhao Y, Li M, Xia Z, Zhang J. Integration of multiple advantages into one catalyst: non-CO pathway of methanol oxidation electrocatalysis on surface Ir-modulated PtFeIr jagged nanowires. J Colloid Interface Sci 2023; 640:348-358. [PMID: 36867931 DOI: 10.1016/j.jcis.2023.02.126] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/17/2023] [Accepted: 02/24/2023] [Indexed: 03/02/2023]
Abstract
Developing highly active methanol oxidation electrocatalysts with superior anti-CO poisoning capability remains a grand challenge. Herein, a simple strategy was employed to prepare distinctive PtFeIr jagged nanowires with Ir located at the shell and Pt/Fe located at the core. The Pt64Fe20Ir16 jagged nanowire possesses an optimal mass activity of 2.13 A mgPt-1 and specific activity of 4.25 mA cm-2, giving the catalyst a great edge over PtFe jagged nanowire (1.63 A mgPt-1 and 3.75 mA cm-2) and Pt/C (0.38 A mgPt-1 and 0.76 mA cm-2). The in-situ Fourier transform infrared (FTIR) spectroscopy and differential electrochemical mass spectrometry (DEMS) unravel the origin of extraordinary CO tolerance in terms of key reaction intermediates in the non-CO pathway. Density functional theory (DFT) calculations add to the body of evidence that the surface Ir incorporation transforms the selectivity from CO pathway to non-CO pathway. Meanwhile, the presence of Ir serves to optimize surface electronic structure with weakened CO binding strength. We believe this work will advance the understanding of methanol oxidation catalytic mechanism and provide some insight into structural design of efficient electrocatalysts.
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Affiliation(s)
- Rongying Zhu
- Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Renqin Yu
- Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Kun Yin
- School of Materials Science and Engineering, Peking University, Beijing, 100871, China
| | - Shiming Zhang
- Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China.
| | - Joey Chung-Yen Jung
- Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Yufeng Zhao
- Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Menggang Li
- School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
| | - Zhonghong Xia
- Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China.
| | - Jiujun Zhang
- Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, China
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Chen W, Cai J, Yang J, Sartin MM, Chen YX. The kinetics of methanol oxidation at a Pt film electrode, a combined mass and infrared spectroscopic study. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.01.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lu J, Hua X, Long YT. Recent advances in real-time and in situ analysis of an electrode–electrolyte interface by mass spectrometry. Analyst 2017; 142:691-699. [DOI: 10.1039/c6an02757a] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Novelty: Recent advances in real-time and in situ monitoring of an electrode–electrolyte interface by mass spectrometry are reviewed.
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Affiliation(s)
- Jusheng Lu
- School of Chemistry and Chemical Engineering
- Jiangsu Normal University
- Xuzhou
- P. R. China
| | - Xin Hua
- Key Laboratory for Advanced Materials and Department of Chemistry
- East China University of Science and Technology
- Shanghai
- P. R. China
| | - Yi-Tao Long
- Key Laboratory for Advanced Materials and Department of Chemistry
- East China University of Science and Technology
- Shanghai
- P. R. China
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Tang Y, Wang Z, Chi X, Sevilla MD, Zeng X. In Situ Generated Platinum Catalyst for Methanol Oxidation via Electrochemical Oxidation of Bis(trifluoromethylsulfonyl)imide Anion in Ionic Liquids at Anaerobic Condition. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:1004-1012. [PMID: 29034058 PMCID: PMC5640268 DOI: 10.1021/acs.jpcc.5b09777] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The bis(trifluoromethylsulfonyl)imide anion is widely used as an ionic liquid anion due to its electrochemical stability and wide electrochemical potential window at aerobic conditions. Here we report an innovative strategy by directly oxidizing bis(trifluoromethylsulfonyl)imide anion to form a radical electrocatalyst on platinum electrode at anaerobic condition. The in situ generated radical catalyst was shown to catalytically and selectively promote the electrooxidation of methanol to form methoxyl radical, in which the formation potential was drastically decreased with the existence of bis(trifluoromethylsulfonyl)imide radical. The electrochemically generated radical catalyst not only facilitates the oxidation of methanol but also provides good selectivity. The unique double layer structure of the 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([Bmpy][NTf2]) likely excludes the diffusion of larger molar mass molecules onto the electrode surface and enables the highly selective methanol oxidation at this IL-electrode interface. Cyclic voltammetry (CV) experiments were used to systematically characterize the details of the electrochemical processes with and without methanol in several other ILs, and a mechanism of the chemical and redox processes was proposed. This study provides a promising new approach for utilizing the unique properties of ionic liquids not only as solvents and electrolytes but also as the medium for in situ generation of electrocatalysts to promote methanol redox reactions for practical applications.
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