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Meenu PC, Samanta PK, Datta SP, Singh SA, Dinda S, Chakraborty C, Roy S. Electro-Oxidation Reaction of Methanol over La 2-xSr xNi 1-y(Mn/Fe/Co) yO 4+δ Ruddlesden-Popper Oxides. Inorg Chem 2024; 63:526-536. [PMID: 38109558 DOI: 10.1021/acs.inorgchem.3c03429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
Solution combustion-synthesized Ruddlesden-Popper oxides La1.4Sr0.6Ni0.9(Mn/Fe/Co)0.1O4+δ were explored for the methanol electro-oxidation reaction. With optimal doping of Sr2+ in the A site and Co2+ in the B site, Ni3+ with t2g6 d x 2 - y 2 1 configuration in La1.4Sr0.6Ni0.9Co0.1O4+δ exhibited a tetragonal distortion with compression in axial bonds and elongation in equatorial bonds. This structural modification fostered an augmented overlap of d z 2 orbitals with axial O 2p orbitals, leading to a heightened density of states at the Fermi level. Consequently, this facilitated not only elevated electrical conductivity but also a noteworthy reduction in the charge transfer resistance. These effects collectively contributed to the exceptional methanol oxidation activity of La1.4Sr0.6Ni0.9Co0.1O4+δ, as evidenced by an impressive current density of 21.4 mA cm-2 and retention of 95% of initial current density even after 10 h of prolonged reaction. The presence of Ni3+ further played a pivotal role in the creation of NiOOH, a crucial intermediate species, facilitated by the presence of surface oxygen vacancies. These factors synergistically enabled efficient methanol oxidation. In summary, our present study not only yields substantial insights but also paves the way for a novel avenue to fine-tune the activity of Ruddlesden-Popper oxides for the successful electro-oxidation of methanol.
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Affiliation(s)
- Preetha Chandrasekharan Meenu
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Pralok K Samanta
- Department of Chemistry, School of Science, GITAM University, Hyderabad 502329, India
| | - Santanu Prasad Datta
- Department of Mechanical Engineering, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Satyapaul A Singh
- Department of Chemical Engineering, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Srikanta Dinda
- Department of Chemical Engineering, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Chanchal Chakraborty
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
| | - Sounak Roy
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Hyderabad 500078, India
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Lin F, Li M, Zeng L, Luo M, Guo S. Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis. Chem Rev 2023; 123:12507-12593. [PMID: 37910391 DOI: 10.1021/acs.chemrev.3c00382] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2023]
Abstract
Electrocatalysis underpins the renewable electrochemical conversions for sustainability, which further replies on metallic nanocrystals as vital electrocatalysts. Intermetallic nanocrystals have been known to show distinct properties compared to their disordered counterparts, and been long explored for functional improvements. Tremendous progresses have been made in the past few years, with notable trend of more precise engineering down to an atomic level and the investigation transferring into more practical membrane electrode assembly (MEA), which motivates this timely review. After addressing the basic thermodynamic and kinetic fundamentals, we discuss classic and latest synthetic strategies that enable not only the formation of intermetallic phase but also the rational control of other catalysis-determinant structural parameters, such as size and morphology. We also demonstrate the emerging intermetallic nanomaterials for potentially further advancement in energy electrocatalysis. Then, we discuss the state-of-the-art characterizations and representative intermetallic electrocatalysts with emphasis on oxygen reduction reaction evaluated in a MEA setup. We summarize this review by laying out existing challenges and offering perspective on future research directions toward practicing intermetallic electrocatalysts for energy conversions.
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Affiliation(s)
- Fangxu Lin
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
- Beijing Innovation Centre for Engineering Science and Advanced Technology, Peking University, Beijing 100871, China
| | - Menggang Li
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Lingyou Zeng
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Mingchuan Luo
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Shaojun Guo
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
- Beijing Innovation Centre for Engineering Science and Advanced Technology, Peking University, Beijing 100871, China
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Milošević D, Stevanović S, Tripković D, Vukašinović I, Maksimović V, Ćosović V, Nikolić ND. Design of Pt-Sn-Zn Nanomaterials for Successful Methanol Electrooxidation Reaction. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4617. [PMID: 37444931 DOI: 10.3390/ma16134617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Revised: 06/19/2023] [Accepted: 06/23/2023] [Indexed: 07/15/2023]
Abstract
This work highlights the potential for the synthesis of new PtSnZn catalysts with enhanced efficiency and durability for methanol oxidation reaction (MOR) in low-temperature fuel cells. In this research, PtZn and PtSnZn nanoparticles deposited on high surface area Vulcan XC-72R Carbon support were created by a microwave-assisted polyol method. The electrochemical performances of synthesized catalysts were analyzed by cyclic voltammetry and by the electrooxidation of adsorbed CO and the chronoamperometric method. The physicochemical properties of obtained catalysts were characterized by transmission electron microscopy (TEM), thermogravimetric (TGA) analysis, energy dispersive spectroscopy (EDS) and by X-ray diffraction (XRD). The obtained findings showed the successful synthesis of platinum-based catalysts. It was established that PtSnZn/C and PtZn/C catalysts have high electrocatalytic performance in methanol oxidation reactions. Catalysts stability tests were obtained by chronoamperometry. Stability tests also confirmed decreased poisoning and indicated improved stability and better tolerance to CO-like intermediate species. According to activity and stability measurements, the PtSnZn/C catalyst possesses the best electrochemical properties for the methanol oxidation reaction. The observed great electrocatalytic activity in the methanol oxidation reaction of synthesized catalysts can be attributed to the beneficial effects of microwave synthesis and the well-balanced addition of alloying metals in PtSnZn/C catalysts.
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Affiliation(s)
- Dragana Milošević
- Department of Ecology and TechnoEconomics, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
| | - Sanja Stevanović
- Department of Electrochemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
| | - Dušan Tripković
- Department of Electrochemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
| | - Ivana Vukašinović
- Department of Mathematics and Physics, Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade, Serbia
| | - Vesna Maksimović
- Vinča Institute of Nuclear Science-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
| | - Vladan Ćosović
- Department for Materials and Metallurgy, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
| | - Nebojša D Nikolić
- Department of Electrochemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
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