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Catalysts
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Novel Developments in Fuel-Cell Oxygen Reduction Electrocatalysts
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Novel Developments in Fuel-Cell Oxygen Reduction Electrocatalysts

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

Deadline for manuscript submissions: closed (15 December 2021) | Viewed by 7098

Special Issue Editors

Prof. Dr. Huabing Tao

E-Mail Website
Guest Editor
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
Interests: oxygen evolution reaction; oxygen reduction reaction; water electrolyzer; fuel cell
Prof. Dr. Hongbin Yang

E-Mail Website
Guest Editor
College of material science and engineering, Suzhou University of Science and Technology, Suzhou, China
Interests: water electrolyzer; CO2 electrocatalysis, electrocatalysts

Special Issue Information

Dear Colleagues,

With carbon neutrality becoming a global agreement, more and more research has been dedicated to the commercialization of fuel cells. However, there are still several challenges remaining in oxygen reduction electrocatalysts. Firstly, the sluggish kinetics of the oxygen reduction reaction requires high Pt loading in PEMFCs, which significantly contributes to the cost of the FCs. Secondly, catalyst stability is still a bottleneck in FC lifetime. Thirdly, the characterization of electrocatalysts in fuel cell devices seems to be very important, as electrochemical tests in electrolytes are quite different from real working conditions. This Special Issue aims to cover recent progress and trends in designing, synthesizing, characterizing, and evaluating advanced electrocatalysts for oxygen reduction in fuel cells.

Prof. Dr. Huabing Tao
Prof. Dr. Hongbin Yang
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • Pt loading
  • alloys
  • proton exchange membrane fuel cells
  • catalyst stability
  • catalyst degradation
  • catalyst-coated membranes
  • working conditions
  • dissolution
  • catalyst support

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Published Papers (2 papers)

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Research

10 pages, 1883 KiB  
Article
Towards the Rational Design of Stable Electrocatalysts for Green Hydrogen Production
by Xiangxi Wang, Shengjie Bi, Junming Zhang and Huabing Tao
Catalysts 2022, 12(2), 204; https://doi.org/10.3390/catal12020204 - 8 Feb 2022
Cited by 7 | Viewed by 2704
Abstract
Now, it is time to set up reliable water electrolysis stacks with active and robust electrocatalysts to produce green hydrogen. Compared with catalytic kinetics, much less attention has been paid to catalyst stability, and the weak understanding of the catalyst deactivation mechanism restricts [...] Read more.
Now, it is time to set up reliable water electrolysis stacks with active and robust electrocatalysts to produce green hydrogen. Compared with catalytic kinetics, much less attention has been paid to catalyst stability, and the weak understanding of the catalyst deactivation mechanism restricts the design of robust electrocatalysts. Herein, we discuss the issues of catalysts’ stability evaluation and characterization, and the degradation mechanism. The systematic understanding of the degradation mechanism would help us to formulate principles for the design of stable catalysts. Particularly, we found that the dissolution rate for different 3d transition metals differed greatly: Fe dissolves 114 and 84 times faster than Co and Ni. Based on this trend, we designed Fe@Ni and FeNi@Ni core-shell structures to achieve excellent stability in a 1 A cm−2 current density, as well as good catalytic activity at the same time. Full article
(This article belongs to the Special Issue Novel Developments in Fuel-Cell Oxygen Reduction Electrocatalysts)
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Graphical abstract

16 pages, 3397 KiB  
Article
The Activity Enhancement Effect of Ionic Liquids on Oxygen Reduction Reaction Catalysts: From Rotating Disk Electrode to Membrane Electrode Assembly
by Kan Huang, Oscar Morales-Collazo, Zhichao Chen, Tangqiumei Song, Liang Wang, Honghong Lin, Joan F. Brennecke and Hongfei Jia
Catalysts 2021, 11(8), 989; https://doi.org/10.3390/catal11080989 - 18 Aug 2021
Cited by 11 | Viewed by 3759
Abstract
Ionic liquids (ILs) have been explored as a surface modification strategy to promote the oxygen reduction reaction (ORR) on Pt/C and their chemical structures were identified to have strong influence on the ORR activities. To better understand the roles of anion and cation [...] Read more.
Ionic liquids (ILs) have been explored as a surface modification strategy to promote the oxygen reduction reaction (ORR) on Pt/C and their chemical structures were identified to have strong influence on the ORR activities. To better understand the roles of anion and cation of ILs on the catalytic reaction, two cations ([MTBD]+ and [bmim]+) were paired with three anions ([TFSI]−, [beti]−, and [C4F9SO3]−) to form various IL structures. By systematically varying the IL combinations and studying their effects on the electrochemical behaviors, such as electrochemical surface area and specific ORR activities, it was found that cation structure had a higher influence than anion, and the impact of the [MTBD]+ series was stronger than the [bmim]+ series. In addition to the investigation in the half-cell, studies were also extended to the membrane electrode assembly (MEA). Considerable performance enhancements were demonstrated in both the kinetic region and high current density region with the aid of IL. This work suggests that IL modification can provide a complementary approach to improve the performance of proton exchange membrane fuel cells. Full article
(This article belongs to the Special Issue Novel Developments in Fuel-Cell Oxygen Reduction Electrocatalysts)
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