Abdelilah Asserghine, Soyoung Kim, Thomas P. Vaid, Armando Santiago-Carboney, Anne J. McNeil* and Joaquín Rodríguez-López*,
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Ionic Strength Impacts Charge Capacity in a Redox-Matched Flow Battery: From Single-Particle Interrogation to Battery Cycling
The redox-matched flow battery (RMFB), which reversibly exchanges charge between a flowable redox mediator and stationary redox-active polymeric beads, has emerged as a viable technology for energy storage. However, RMFBs suffer from an underutilized charge capacity. In this work, we show that lower ionic strength solutions lead to significant increases in the charge capacity of ferrocene-functionalized beads in RMFBs. Single-particle experiments using scanning electrochemical cell microscopy (SECCM) showed that voltammetric peaks associated with the ferrocene redox dramatically increased in intensity (∼7-fold) as the ionic strength was decreased from 1000 to 10 mM of tetrabutylammonium hexafluorophosphate (TBAPF6) in propylene carbonate. This change was accompanied by an increase in the particle size. Furthermore, higher performance (∼92% theoretical capacity utilization) was observed in RMFB cycling at 10 mM TBAPF6 compared to 57% at 1000 mM TBAPF6. Our results highlight the critical role of supporting electrolyte concentration in polymer-bead-based redox-matched flow batteries.
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.