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Catalysts
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Electrocatalytic Water Oxidation, 2nd Edition
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Electrocatalytic Water Oxidation, 2nd Edition

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

Deadline for manuscript submissions: 15 May 2025 | Viewed by 3571

Special Issue Editors

Dr. Yurii V. Geletii

E-Mail Website
Guest Editor
Department of Chemistry, Emory University, Atlanta, GA 30322, USA
Interests: artificial photosynthesis; water splitting; water oxidation catalysts; electron transfer reactions
Special Issues, Collections and Topics in MDPI journals
Dr. Tam D. Nguyen

E-Mail Website
Guest Editor
School of Chemistry, Monash University, Clayton, VIC 3800, Australia
Interests: electrocatalysis of water splitting reactions; materials for electrical energy storage and conversion; semiconductor and electrochromic nanomaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to announce the launch of the second edition of our Special Issue titled “Electrocatalytic Water Oxidation, 2nd Edition”. 

Water electrolysis to produce oxygen and hydrogen gas is a promising option to convert solar energy to fuel. Electrolyzers, particularly the ones using a liquid alkaline solution of sodium or potassium hydroxide as the electrolyte, have been commercially available for many years, but their electrical efficiency is rather low, 70–80%. Water oxidation on anode is a 4-electron process that requires the use of a cost-effective catalyst. Despite numerous efforts, such catalysts for a new generation of electrolyzers have not yet been developed. This Special Issue will be mostly focused on understanding the mechanism of water oxidation in the presence of homogeneous or immobilized molecular catalysts. The catalysts with thoroughly characterized reactive centers will be also considered.

Dr. Yurii V. Geletii
Dr. Tam D. Nguyen
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 2200 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

  • water oxidation
  • electron transfer
  • molecular catalyst
  • mechanism of O2 formation

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Related Special Issue

Published Papers (3 papers)

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Research

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16 pages, 3640 KiB  
Article
Cobalt Molybdenum Telluride as an Efficient Trifunctional Electrocatalyst for Seawater Splitting
by Rajarshi Kar, Amideddin Nouralishahi, Harish Singh and Manashi Nath
Catalysts 2024, 14(10), 684; https://doi.org/10.3390/catal14100684 - 2 Oct 2024
Viewed by 894
Abstract
A mixed-metal ternary chalcogenide, cobalt molybdenum telluride (CMT), has been identified as an efficient tri-functional electrocatalyst for seawater splitting, leading to enhanced oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR). The CMT was synthesized by a single step [...] Read more.
A mixed-metal ternary chalcogenide, cobalt molybdenum telluride (CMT), has been identified as an efficient tri-functional electrocatalyst for seawater splitting, leading to enhanced oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR). The CMT was synthesized by a single step hydrothermal technique. Detailed electrochemical studies of the CMT-modified electrodes showed that CMT has a promising performance for OER in the simulated seawater solutions, exhibiting a small overpotential of 385 mV at 20 mA cm−2, and superior catalyst durability for prolonged period of continuous oxygen evolution. Interestingly, while gas chromatography analysis confirmed the evolution of oxygen in an anodic chamber, it showed that there was no chlorine evolution from these electrodes in alkaline seawater, highlighting the novelty of this catalyst. CMT also displayed remarkable ORR activity in simulated seawater as indicated by its four-electron reduction pathway forming water as the dominant product. One of the primary challenges of seawater splitting is chlorine evolution from the oxidation of dissolved chloride salts. The CMT catalyst successfully and significantly lowers the water oxidation potential, thereby separating the chloride and water oxidation potentials by a larger margin. These results suggest that CMT can function as a highly active tri-functional electrocatalyst with significant stability, making it suitable for clean energy generation and environmental applications using seawater. Full article
(This article belongs to the Special Issue Electrocatalytic Water Oxidation, 2nd Edition)
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12 pages, 2653 KiB  
Article
Facile Immersing Synthesis of Pt Single Atoms Supported on Sulfide for Bifunctional toward Seawater Electrolysis
by Jian Shen, Guotao Yang, Tianshui Li, Wei Liu, Qihao Sha, Zheng Zhong and Yun Kuang
Catalysts 2024, 14(8), 477; https://doi.org/10.3390/catal14080477 - 26 Jul 2024
Cited by 1 | Viewed by 775
Abstract
Seawater electrolysis for hydrogen production represents a substantial opportunity to curtail production expenditures and exhibits considerable potential for various industrial applications. Platinum-based precious metals exhibit excellent activity for water electrolysis. However, their limited reserves and high costs impede their widespread use on a [...] Read more.
Seawater electrolysis for hydrogen production represents a substantial opportunity to curtail production expenditures and exhibits considerable potential for various industrial applications. Platinum-based precious metals exhibit excellent activity for water electrolysis. However, their limited reserves and high costs impede their widespread use on a large scale. Single-atom catalysts, characterized by low loading and high utilization efficiency, represent a viable alternative, and the development of simple synthesis methods can facilitate their practical application. In this work, we report the facile synthesis of a single-atom Pt-loaded NiCoFeSx (Pt@NiCoFeSx) bifunctional catalytic electrode using a simple impregnation method on a nickel foam substrate. The resulting electrode exhibits low overpotentials for both HER (60 mV@10 mA cm−2) and OER (201 mV@10 mA cm−2) in alkaline seawater electrolytes. When incorporated into a seawater electrolyzer, this electrode achieves a direct current energy consumption of only 4.18 kWh/Nm3H2 over a 100 h test period with negligible decay. These findings demonstrate the potential of our approach for industrial-scale seawater electrolysis. Full article
(This article belongs to the Special Issue Electrocatalytic Water Oxidation, 2nd Edition)
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7 pages, 192 KiB  
Opinion
Measurements of Dioxygen Formation in Catalytic Electrochemical Water Splitting
by Chandan Kumar Tiwari and Yurii V. Geletii
Catalysts 2024, 14(1), 13; https://doi.org/10.3390/catal14010013 - 22 Dec 2023
Viewed by 1440
Abstract
Water oxidation is a multielectron complex reaction that produces molecular oxygen as the final product. The article addresses the lack of confirmation of oxygen product formation in electrochemical oxygen evolution reaction (OER) studies, despite the extensive research conducted on catalysts for water splitting. [...] Read more.
Water oxidation is a multielectron complex reaction that produces molecular oxygen as the final product. The article addresses the lack of confirmation of oxygen product formation in electrochemical oxygen evolution reaction (OER) studies, despite the extensive research conducted on catalysts for water splitting. It critically evaluates the trend observed in many studies that solely rely on electrochemical methods for OER quantification without confirming the oxygen product via complementary analytical techniques. The omission of measuring evolved oxygen gas leaves a crucial gap in the quantification of the OER process and raises concerns about the validity and accuracy of reported results. Analytical techniques, such as gas chromatography, Rotating Ring-Disk Electrode (RRDE), fluorescence oxygen probes, Clark electrode, and volumetry are critically analyzed and described to ensure the reliability and credibility of voltammetry and bulk electrolysis to provide a more accurate assessment of the OER process. Full article
(This article belongs to the Special Issue Electrocatalytic Water Oxidation, 2nd Edition)
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