New Trends of Ionic Liquids Design and Their Applications in Catalysis

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Industrial Catalysis".

Deadline for manuscript submissions: closed (15 January 2023) | Viewed by 1819

Special Issue Editor

1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430064, China
Interests: green chemistry, CO2 capture and utilization (CCU); organometallic catalytic materials (MOFs, MOPs); organic synthesis of fine chemicals and polymers; synthesis and application of perovskite or other organic photoelectric materials
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Special Issue Information

Dear Colleagues,

As a series of compounds consisting of cations and anions, while existing in the liquid phase whose melting point is below some arbitrary temperature, such as 100 °C (212 °F), ionic liquids (ILs) have attracted extensive attention for their numerous specific properties since they were developed by Paul Walden in 1914. Among numerous properties, their flexible designability and tunability on structures are essential for exhibiting a great potential in catalysis. During the past few decades, ILs were rapidly developed and utilized as green solvents and catalysts. Specifically, the melting points, polarity, affinity, etc., could be precisely controlled by tuning the cations and anions. Meanwhile, the appropriate catalytic sites could also be incorporated to promote the proceedings of the required reactions. In view of catalytic features, a flexible designability and tunability enable reactions involving ILs to be advantageous in both homogeneous and heterogeneous catalysis. For example, the compatibility of reactants and ILs can be adjusted by tuning the structures of ILs, thus creating a homogeneous condition for the catalysis. Once the reactions are completed, the products and ILs can be conveniently separated by extraction or distillation, which benefits from the low vapor pressure and polarity of the designed ILs. Consequently, an ingenious designability and tunability on structures used to create task-specific ILs has become the new trend of ILs development for their applications in catalysis.

Dr. Ye Yuan
Guest Editor

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Keywords

  • ionic liquids
  • task-specific designs
  • catalytic applications
  • green chemistry
  • homogeneous catalysis
  • heterogeneous catalysis
  • synthesis and separation
  • new trends in the future

Published Papers (1 paper)

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Research

12 pages, 2424 KiB  
Article
Mechanistic Studies of Improving Pt Catalyst Stability at High Potential via Designing Hydrophobic Micro-Environment with Ionic Liquid in PEMFC
by Lei Huang, Fen Zhou, Hui Zhang, Jinting Tan and Mu Pan
Catalysts 2023, 13(2), 374; https://doi.org/10.3390/catal13020374 - 8 Feb 2023
Viewed by 1584
Abstract
Recently, the focus of fuel cell technologies has shifted from light-duty automotive to heavy-duty vehicle applications, which require improving the stability of membrane electrode assemblies (MEAs) at high constant potential. The hydrophilicity of Pt makes it easy to combine with water molecules and [...] Read more.
Recently, the focus of fuel cell technologies has shifted from light-duty automotive to heavy-duty vehicle applications, which require improving the stability of membrane electrode assemblies (MEAs) at high constant potential. The hydrophilicity of Pt makes it easy to combine with water molecules and then oxidize at high potential, resulting in poor durability of the catalyst. In this work, an ionic liquid [BMIM][NTF2] was used to modify the Pt catalyst (Pt/C + IL) to create a hydrophobic, antioxidant micro-environment in the catalyst layer (CL). The effect of [BMIM][NTF2] on the decay of the CL performance at high constant potential (0.85 V) for a long time was investigated. It was found that the performance attenuation of Pt/C + IL in the high-potential range (OCV 0.75 V) was less than that of commercial Pt/C after 10 h. The Pt-oxide coverage test showed that the hydrophobic micro-environment of the CL enhanced the stability by inhibiting Pt oxidation. In addition, the electrochemical recovery of Pt oxides showed that the content of recoverable oxides in Pt/C + IL was higher than that in commercial Pt/C. Overall, modifying the Pt catalyst with hydrophobic ionic liquid is an effective strategy to improve the catalyst stability and reduce the irreversible voltage loss caused by the oxide at high constant potential. Full article
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