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Metals
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Metal Catalysts for Heterogeneous Catalytic Reactions
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Metal Catalysts for Heterogeneous Catalytic Reactions

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 2969

Special Issue Editors

Dr. Chao Huang

E-Mail Website
Guest Editor
Plasma Laboratory, City University of Hong Kong, Kowloon 518057, Hong Kong
Interests: materials synthesis; innovative approach in electrocatalysts; hydrogen evolution reaction; oxygen evolution reaction; water splitting; nanometals
Special Issues, Collections and Topics in MDPI journals
Dan Li

E-Mail Website
Guest Editor Assistant
Plasma Laboratory, City University of Hong Kong, Kowloon 518057, Hong Kong
Interests: hydrogen evolution reaction; oxygen evolution reaction; water splitting; nanometals; urea reaction

Special Issue Information

Dear Colleagues,

Hydrogen energy is known as the next generation of secondary clean energy, but the cost of hydrogen preparation has always been a bottleneck hindering the large-scale application of hydrogen energy, especially green hydrogen production. While hydrogen fuel can be produced in a more environmentally friendly way through the electrolysis of water, fossil fuels are still currently used in the hydrogen-powered production chain. Therefore, the energy used for hydrogen fuel production must be produced using green technologies to ensure that hydrogen fuel vehicles are considered a better environmental choice. Water molecules are a very abundant source of green hydrogen, and thus determining a way to make the hydrogen extraction reaction from water happen at a lower temperature with high efficiency has always been a challenge for researchers worldwide.

At present, the universal catalyst for hydrogen production in electrolyzed water is Pt/C, but its cost is high and it is difficult to apply on a large scale. Preparing high-performance, high-stability catalysts with inexpensive non-precious-metal catalysts is a challenge. Aiming at the major strategic goals of energy and the environment, it is necessary to deeply explore the relationship between the structure and performance of heterogeneous metal catalysts to develop new catalytic materials, from exploring key scientific issues to solving practical application problems. For this Special Issue of Metals, we welcome reviews and articles on the principles, theoretical calculation, material preparation and characterization, and applications of hydrogen metal catalysts.

Dr. Chao Huang
Guest Editor

Dan Li
Guest Editor Assistant

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metal catalysts
  • electrocatalysis
  • materials synthesis
  • hydrogen evolution reaction
  • oxygen evolution reaction
  • water splitting
  • alloys and compounds
  • hydrogen

Published Papers (2 papers)

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Research

15 pages, 18824 KiB  
Article
Microstructure Characteristics and Mechanical Properties of Flash Butt Welded 590 MPa V-N Microalloyed Heavy-Duty Truck Wheel Steel
by Cairu Gao, Kaiyu Cui, Huifang Lan, Tao Liu, Linxiu Du, Yujiao Ma, Xinxin Guo and Chenshuo Cui
Metals 2023, 13(4), 688; https://doi.org/10.3390/met13040688 - 30 Mar 2023
Cited by 1 | Viewed by 1074
Abstract
This study reports the welded joint of a novel 590 MPa V-N microalloyed wheel steel on microstructure and mechanical properties after flash butt welding. The welding parameters were flash current 48°/582.0 A, upsetting current 44°/516.6 A, and workpiece clearance 1.5 mm. The evolution [...] Read more.
This study reports the welded joint of a novel 590 MPa V-N microalloyed wheel steel on microstructure and mechanical properties after flash butt welding. The welding parameters were flash current 48°/582.0 A, upsetting current 44°/516.6 A, and workpiece clearance 1.5 mm. The evolution of microstructure in the welded joint occurred as follows: welding seam (ferrite side plate + acicular ferrite +martensite)→coarse-grained zone (acicular ferrite + granular bainite)→fine-grained zone (fine-grained ferrite + M/A island)→base metal (equiaxed ferrite + pearlite). The standard impact energy value of welding seam, coarse grain zone, fine grain zone, and base metal at −40 °C was 116, 128, 144, and 88 J, respectively. The mechanical property of the joint was excellent. The microstructure, the number of grain boundaries, and the dislocation density directly affected the strength and hardness of the joint. The increase of large angle grain boundaries and the decrease of effective grain size were beneficial to the improvement of toughness. The hot-rolled 590 MPa V-N microalloyed wheel steel had superior weldability. Full article
(This article belongs to the Special Issue Metal Catalysts for Heterogeneous Catalytic Reactions)
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12 pages, 3900 KiB  
Article
Hydrogen Embrittlement Susceptibility of Corrosion-Resistant Spring Rod Used in High-Speed Railway
by Jinbo Li, Xiuhua Gao, Hongwei Chen, Hongyan Wu, Linxiu Du and Chen Chen
Metals 2023, 13(1), 147; https://doi.org/10.3390/met13010147 - 11 Jan 2023
Cited by 1 | Viewed by 1473
Abstract
The corrosion of spring steel is very important for vehicle safety. In this work, we conducted an experiment on multi-element micro-alloy composition design; the corrosion resistance of a 60Si2Mn spring was improved by adding Cr, Ni, Cu and other corrosion-resistant elements, and the [...] Read more.
The corrosion of spring steel is very important for vehicle safety. In this work, we conducted an experiment on multi-element micro-alloy composition design; the corrosion resistance of a 60Si2Mn spring was improved by adding Cr, Ni, Cu and other corrosion-resistant elements, and the corrosion resistance index (I) was increased from 3.21 to 8.62. Hydrogen embrittlement resistance was studied using a hydrogen permeation experiment and a slow strain rate tensile experiment. For this study, the following steps were performed: Firstly, the material composition was designed, and the experimental materials that met the experimental design were prepared according to the corresponding deformation and heat treatment process; secondly, the experimental materials were charged with hydrogen; and finally, conventional tensile testing, slow tensile testing and fracture morphology testing were carried out. A hydrogen permeation experiment was carried out for the materials. The result showed that, with the increase of hydrogen charging time, the hydrogen content of two steel samples increased, and the plasticity indexes such as elongation and reduction of the area appeared in three different stages which rapidly decreased, slowly declined, and then tended to balance. The uniform NbC nano precipitated phase can double the number of irreversible hydrogen traps (Nir) per unit volume, and decreased the effective hydrogen diffusion coefficient (Deff) from 1.135 × 10−10 to 6.036 × 10−11. It limited the free diffusion of hydrogen and made the immersed hydrogen harmless, thus improving the hydrogen embrittlement resistance of corrosion-resistant spring steel 60Si2Mn. Full article
(This article belongs to the Special Issue Metal Catalysts for Heterogeneous Catalytic Reactions)
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