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Catalysts
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Heterogeneous Electrocatalysis: Fundamentals and Applications II
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Heterogeneous Electrocatalysis: Fundamentals and Applications II

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

Deadline for manuscript submissions: closed (10 February 2023) | Viewed by 8079

Special Issue Editors

Prof. Dr. Yu Zhang

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Guest Editor
School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
Interests: rechargeable batteries; electrochemical CO2 reduction
Special Issues, Collections and Topics in MDPI journals
Dr. Yao Yao

E-Mail Website
Guest Editor
Laboratory of Photonics and Interfaces, École polytechnique fédérale de Lausanne, Lausanne, Switzerland
Interests: electrochemical CO2 reduction reaction; electrochemical N2 reduction reaction; surface enhanced IR absorption spectroscopy; membrane electrode assembly based electrolyzer
Special Issues, Collections and Topics in MDPI journals
Dr. Mengjiao Wang

E-Mail Website
Guest Editor
Center for Materials Research, Justus Liebig University Giessen, 35392 Giessen, Germany
Interests: electrocatalysis and photocatalysis; hydrothermal and colloidal synthesis; 2D layered materials; surface science; nanomaterials for potential applications

Special Issue Information

Dear Colleagues,

Heterogeneous electrocatalysis has attracted great attention in recent years as a key process in renewable energy conversion and storage techniques, such as fuel cells, water electrolysis, CO2/N2 electrochemical reduction techniques, and electrochemical synthesis techniques. To realize their industrial application, both fundamental and applied research work are required. Investigations on the reaction mechanisms/reaction kinetics/mass transfer at the electrocatalysis interface, development of electrocatalysts with high reactivity/stability and study of their degradation mechanisms, and techniques to scale up the electrocatalysis systems are indispensable.

In the past few years, the community has witnessed rapid and continuous development in the field of heterogeneous electrocatalysis. This Special Issue will cover experimental and theoretical studies in various electrochemical reactions, particularly CO2/N2/ nitrate electrochemical reduction, reactions in fuel cells, and water electrolysis. Both fundamental and applied studies are of interest, particularly regarding the development of new electrocatalysis systems with high activity/stability and the study of their degradation mechanism, fundamental investigations into the reaction mechanism/reaction kinetics/mass transfer at the electrocatalysis interface, and techniques to scale up electrocatalysis systems. The hope is to compile a set of high-quality manuscripts that convey exciting advances in the field of heterogeneous electrocatalysis.

Prof. Dr. Yu Zhang
Dr. Yao Yao
Dr. Mengjiao Wang
Guest Editors

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. Catalysts 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 2700 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

  • electrocatalysis 
  • electrocatalysts 
  • reaction mechanisms 
  • CO2 reduction reaction 
  • N2 reduction reaction 
  • nitrate reduction reaction 
  • O2 reduction/evolution reaction 
  • H2 evolution/oxidation reaction 
  • ethanol/methanol/formic acid oxidation reaction 
  • in situ characterizations

Published Papers (4 papers)

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Research

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12 pages, 2288 KiB  
Article
New Insights into the Surfactant-Assisted Liquid-Phase Exfoliation of Bi2S3 for Electrocatalytic Applications
by Mengjiao Wang, Matteo Crisci, Matilde Pavan, Zheming Liu, Jaime Gallego and Teresa Gatti
Catalysts 2023, 13(3), 551; https://doi.org/10.3390/catal13030551 - 09 Mar 2023
Cited by 5 | Viewed by 1655
Abstract
During water electrolysis, adding an electrocatalyst for the hydrogen evolution reaction (HER) is necessary to reduce the activation barrier and thus enhance the reaction rate. Metal chalcogenide-based 2D nanomaterials have been studied as an alternative to noble metal electrocatalysts because of their interesting [...] Read more.
During water electrolysis, adding an electrocatalyst for the hydrogen evolution reaction (HER) is necessary to reduce the activation barrier and thus enhance the reaction rate. Metal chalcogenide-based 2D nanomaterials have been studied as an alternative to noble metal electrocatalysts because of their interesting electrocatalytic properties and low costs of production. However, the difficulty in improving the catalytic efficiency and industrializing the synthetic methods have become a problem in the potential application of these species in electrocatalysis. Liquid-phase exfoliation (LPE) is a low-cost and scalable technique for lab- and industrial-scale synthesis of 2D-material colloidal inks. In this work, we present, to the best of our knowledge, for the first time a systematic study on the surfactant-assisted LPE of bulk Bi2S3 crystalline powder to produce nanosheets (NSs). Different dispersing agents and LPE conditions have been tested in order to obtain colloidal low-dimensional Bi2S3 NSs in H2O at optimized concentrations. Eventually, colloidally stable layered nano-sized Bi2S3 suspensions can be produced with yields of up to ~12.5%. The thus obtained low-dimensional Bi2S3 is proven to be more active for HER than the bulk starting material, showing an overpotential of only 235 mV and an optimized Tafel slope of 125 mV/dec. Our results provide a facile top-down method to produce nano-sized Bi2S3 through a green approach and demonstrate that this material can have a good potential as electrocatalyst for HER. Full article
(This article belongs to the Special Issue Heterogeneous Electrocatalysis: Fundamentals and Applications II)
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12 pages, 3998 KiB  
Article
Two-Dimensional Fe-N-C Nanosheets for Efficient Oxygen Reduction Reaction
by Xin Wu, Wenke Xie, Xuanhe Liu, Xiaoming Liu and Qinglan Zhao
Catalysts 2022, 12(10), 1276; https://doi.org/10.3390/catal12101276 - 19 Oct 2022
Cited by 2 | Viewed by 1799
Abstract
Fe-N-doped carbon (Fe-N-C)-based electrocatalysts are considered to be promising alternatives to replace Pt-based catalysts for oxygen reduction reactions (ORR). Here, we reported a simple and effective approach to prepare Fe-N-C-based electrocatalysts with the shape of two-dimensional nanosheets (termed Fe/NCNSs) to enhance the ORR [...] Read more.
Fe-N-doped carbon (Fe-N-C)-based electrocatalysts are considered to be promising alternatives to replace Pt-based catalysts for oxygen reduction reactions (ORR). Here, we reported a simple and effective approach to prepare Fe-N-C-based electrocatalysts with the shape of two-dimensional nanosheets (termed Fe/NCNSs) to enhance the ORR performance. Fe/NCNSs were prepared by the calcination of Fe/Zn dual-metal ZIFs nanosheets as precursors. Benefiting from its higher specific surface area, electrochemically active surface area, and proportion of pyridinic N and Fe-N, the optimized Fe/NCNS showed excellent ORR performance both in acidic (E1/2 = 0.725 V vs. RHE) and alkaline (E1/2 = 0.865 vs. RHE) media, being 23 mV more negative and 24 mV more positive than that of a commercial Pt/C. The optimized Fe/NCNS also exhibited long durability. In addition, the Zn-air battery with Fe/NCNS-1 and RuO2 as the air catalyst exhibited high power density (1590 mW cm−2 at a current density of 2250 mA cm−2) and superior charging/discharging durability. Full article
(This article belongs to the Special Issue Heterogeneous Electrocatalysis: Fundamentals and Applications II)
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12 pages, 5139 KiB  
Article
Defect Engineering and Surface Polarization of TiO2 Nanorod Arrays toward Efficient Photoelectrochemical Oxygen Evolution
by Yueying Li, Shiyu Liang, Huanhuan Sun, Wei Hua and Jian-Gan Wang
Catalysts 2022, 12(9), 1021; https://doi.org/10.3390/catal12091021 - 08 Sep 2022
Cited by 5 | Viewed by 1562
Abstract
The relatively low photo-conversion efficiencies of semiconductors greatly restrict their real-world practices toward photoelectrochemical water splitting. In this work, we demonstrate the fabrication of TiO2-x nanorod arrays enriched with oxygen defects and surface-polarized hydroxyl groups by a facile surface reduction method. The [...] Read more.
The relatively low photo-conversion efficiencies of semiconductors greatly restrict their real-world practices toward photoelectrochemical water splitting. In this work, we demonstrate the fabrication of TiO2-x nanorod arrays enriched with oxygen defects and surface-polarized hydroxyl groups by a facile surface reduction method. The oxygen defects located in the bulk/surface of TiO2-x enable fast charge transport and act as catalytically active sites to accelerate the water oxidation kinetics. Meanwhile, the hydroxyl groups could establish a surface electric field by polarization, for efficient charge separation. The as-optimized TiO2-x nanorod photoanode achieves a high photocurrent density of 2.62 mA cm−2 without any cocatalyst loading at 1.23 VRHE under 100 mW cm−2, which is almost double that of the bare TiO2 counterpart. Notably, the surface charge separation and injection efficiency of the TiO2-x photoanode reach as high as 80% and 97% at 1.23 VRHE, respectively, and the maximum incident photon-to-current efficiency reaches 90% at 400 nm. This work provides a new surface treatment strategy for the development of high-performance photoanodes in photoelectrochemical water splitting. Full article
(This article belongs to the Special Issue Heterogeneous Electrocatalysis: Fundamentals and Applications II)
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Review

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19 pages, 5161 KiB  
Review
Research Progress of Copper-Based Bimetallic Electrocatalytic Reduction of CO2
by Xiaolei Hong, Haiyan Zhu, Dianchen Du, Quanshen Zhang and Yawei Li
Catalysts 2023, 13(2), 376; https://doi.org/10.3390/catal13020376 - 09 Feb 2023
Cited by 5 | Viewed by 2506
Abstract
Fossil fuels are still the main source of energy in today’s society, so emissions of CO2 are inevitable, but when the CO2 level in the atmosphere is too high, many environmental problems will arise, such as the greenhouse effect, among others. [...] Read more.
Fossil fuels are still the main source of energy in today’s society, so emissions of CO2 are inevitable, but when the CO2 level in the atmosphere is too high, many environmental problems will arise, such as the greenhouse effect, among others. Electrocatalytic reduction of CO2 is one of the most important methods that one can use to reduce the amount of CO2 in the atmosphere. This paper reviews bimetallic catalysts prepared on the basis of copper materials, such as Ag, Au, Zn and Ni. The effects of different ratios of metal atoms in the bimetallic catalysts on the selectivity of CO2RR were investigated and the effects of bimetallic catalysts on the CO2RR of different ligands were also analysed. Finally, this paper points out that the real reaction of CO2RR still needs to be studied and analysed, and the effect of the specific reaction environment on selectivity has not been thoroughly studied. This article also describes some of the problems encountered so far. Full article
(This article belongs to the Special Issue Heterogeneous Electrocatalysis: Fundamentals and Applications II)
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