Crowding Agent Stabilizes Aqueous Electrolyte for Reversible Iron Metal Anode

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2025-02-03 DOI:10.1021/acsenergylett.4c03268

Louisa C. Greenburg, John Holoubek, Yi Cui, Pu Zhang, Huayue Ai, Elizabeth Zhang, Chenwei Liu, Guangxia Feng, Yi Cui

{"title":"Crowding Agent Stabilizes Aqueous Electrolyte for Reversible Iron Metal Anode","authors":"Louisa C. Greenburg, John Holoubek, Yi Cui, Pu Zhang, Huayue Ai, Elizabeth Zhang, Chenwei Liu, Guangxia Feng, Yi Cui","doi":"10.1021/acsenergylett.4c03268","DOIUrl":null,"url":null,"abstract":"Aqueous batteries with Fe metal anodes are a promising technology for safe, low-cost stationary storage. Fe can deliver high gravimetric and volumetric capacities, but its commercial viability is hindered by competing side reactions and low Coulombic efficiency. This work explores the feasibility of employing polyethylene glycol (PEG) as a crowding agent in Fe electrolyte to suppress the competing hydrogen evolution reaction (HER) and improve Fe plating/stripping efficiency. We demonstrate that in a 1 molal Fe electrolyte, employing 60% PEG/40% H2O as the solvent yields higher Coulombic efficiency in Fe||Cu half cells and enables over two times the cycle life in Fe||Fe symmetric cells compared to the control composed of 100% H2O solvent. Further, we find that the 60% PEG electrolyte decreases H2 generation by almost 10 times during cycling. This electrolyte engineering approach also yields more crystalline Fe nuclei and denser growth during plating, leading to highly compact and reversible Fe anodes. Our results encourage further development of molecular crowding electrolytes for high efficiency Fe metal anodes.","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":"84 1","pages":""},"PeriodicalIF":19.3000,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Energy Letters ","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acsenergylett.4c03268","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Aqueous batteries with Fe metal anodes are a promising technology for safe, low-cost stationary storage. Fe can deliver high gravimetric and volumetric capacities, but its commercial viability is hindered by competing side reactions and low Coulombic efficiency. This work explores the feasibility of employing polyethylene glycol (PEG) as a crowding agent in Fe electrolyte to suppress the competing hydrogen evolution reaction (HER) and improve Fe plating/stripping efficiency. We demonstrate that in a 1 molal Fe electrolyte, employing 60% PEG/40% H₂O as the solvent yields higher Coulombic efficiency in Fe||Cu half cells and enables over two times the cycle life in Fe||Fe symmetric cells compared to the control composed of 100% H₂O solvent. Further, we find that the 60% PEG electrolyte decreases H₂ generation by almost 10 times during cycling. This electrolyte engineering approach also yields more crystalline Fe nuclei and denser growth during plating, leading to highly compact and reversible Fe anodes. Our results encourage further development of molecular crowding electrolytes for high efficiency Fe metal anodes.

Abstract Image

查看原文本刊更多论文

填充剂稳定可逆铁金属阳极的水电解质

具有铁金属阳极的水电池是一种很有前途的安全、低成本的固定存储技术。铁可以提供高的重量和体积容量，但其商业可行性受到竞争副反应和低库仑效率的阻碍。本研究探讨了聚乙二醇（PEG）作为拥挤剂在铁电解液中抑制析氢竞争反应（HER）和提高铁电镀/剥离效率的可行性。我们证明了在1mol / l的Fe电解质中，采用60% PEG/40% H2O作为溶剂，Fe||Cu半电池的库仑效率更高，Fe||Fe对称电池的循环寿命是由100% H2O溶剂组成的对照组的两倍以上。此外，我们发现60%的PEG电解质在循环过程中减少了近10倍的氢气生成。这种电解质工程方法还可以在电镀过程中产生更多的结晶铁核和更密集的生长，从而产生高度致密和可逆的铁阳极。我们的结果鼓励了分子拥挤电解质的进一步发展，用于高效铁金属阳极。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.