{"title":"Tuning the sulfide interface of MnCo2O4-based nanostructures enables efficient water/seawater electrolysis","authors":"","doi":"10.1016/j.ijhydene.2024.09.315","DOIUrl":null,"url":null,"abstract":"<div><div>Hydrogen generation through water electrolysis is greatly dependent on the development of energy and time-efficient techniques to construct stable and active electrocatalysts for oxygen evolution reaction (OER). Currently, major research focuses on producing hydrogen through direct seawater electrolysis instead of fresh water to build a sustainable society. However, competitive reactions such as chlorine evolution reaction (CIER) beyond OER and electrode erosion issues make seawater electrolysis more difficult. Here, we report an interfacial engineering strategy that constructs a MnCo<sub>2</sub>O<sub>4</sub>@CoS hybrid structure by sulfurization of the spinal MnCo<sub>2</sub>O<sub>4</sub> nanowires. The hybrid structure demonstrates an excellent OER performance in electrolytes containing alkaline and saltwater. Specifically, the prepared catalyst needs overpotentials of 205 mV and 225 mV to deliver a current density of 10 mA cm<sup>−2</sup> in 1 M KOH and alkaline seawater when used as OER electrocatalysts. This should be noted that the CoS layer on the surface of MnCo<sub>2</sub>O<sub>4</sub> nanowires not only acts as a Cl<sup>‾</sup> protective layer to impede electrode erosion and CIER but also provides metallic ions with a higher valence state to enhance the intrinsic catalytic activity of water oxidization. Thus, this type of electrocatalyst could represent a favorable choice, carrying substantial implications for hydrogen-based economies and environmental enhancement.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Hydrogen Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0360319924040242","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Hydrogen generation through water electrolysis is greatly dependent on the development of energy and time-efficient techniques to construct stable and active electrocatalysts for oxygen evolution reaction (OER). Currently, major research focuses on producing hydrogen through direct seawater electrolysis instead of fresh water to build a sustainable society. However, competitive reactions such as chlorine evolution reaction (CIER) beyond OER and electrode erosion issues make seawater electrolysis more difficult. Here, we report an interfacial engineering strategy that constructs a MnCo2O4@CoS hybrid structure by sulfurization of the spinal MnCo2O4 nanowires. The hybrid structure demonstrates an excellent OER performance in electrolytes containing alkaline and saltwater. Specifically, the prepared catalyst needs overpotentials of 205 mV and 225 mV to deliver a current density of 10 mA cm−2 in 1 M KOH and alkaline seawater when used as OER electrocatalysts. This should be noted that the CoS layer on the surface of MnCo2O4 nanowires not only acts as a Cl‾ protective layer to impede electrode erosion and CIER but also provides metallic ions with a higher valence state to enhance the intrinsic catalytic activity of water oxidization. Thus, this type of electrocatalyst could represent a favorable choice, carrying substantial implications for hydrogen-based economies and environmental enhancement.
期刊介绍:
The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc.
The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.