Stable, Impermeable Hexacyanoferrate Anolyte for Nonaqueous Redox Flow Batteries

Yuyue Zhao; Sambasiva R. Bheemireddy; Diqing Yue; Zhou Yu; Mohammad Afsar Uddin; Haoyu Liu; Zhiguang Li; Xiaoting Fang; Xingyi Lyu; Garvit Agarwal; Zhangxing Shi; Lily A. Robertson; Lei Cheng; Tao Li; Rajeev S. Assary; Venkat Srinivasan; Susan J. Babinec; Zhengcheng Zhang; Jeffrey S. Moore; Ilya A. Shkrob; Xiaoliang Wei; Lu Zhang

doi:10.1021/acsenergylett.4c01351

journal article·2024-09-13Open access

Stable, Impermeable Hexacyanoferrate Anolyte for Nonaqueous Redox Flow Batteries

Yuyue Zhao, Sambasiva R. Bheemireddy, Diqing Yue, Zhou Yu, Mohammad Afsar Uddin, Haoyu Liu, Zhiguang Li, Xiaoting Fang, Xingyi Lyu, Garvit Agarwal, Zhangxing Shi, Lily A. Robertson, Lei Cheng, Tao Li, Rajeev S. Assary, Venkat Srinivasan, Susan J. Babinec, Zhengcheng Zhang, Jeffrey S. Moore, Ilya A. Shkrob, Xiaoliang Wei, Lu Zhang

ACS Energy Letters· Volume 9· Issue 9

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Source abstract

Abstract

Redox-active molecules, or redoxmers, in nonaqueous redox flow batteries often suffer from membrane crossover and low electrochemical stability. Transforming inorganic polyionic redoxmers established for aqueous batteries into nonaqueous candidates is an attractive strategy to address these challenges. Here we demonstrate such tailoring for hexacyanoferrate (HCF) by pairing the anions with tetra- n -butylammonium cation (TBA + ). TBA 3 HCF has good solubility in acetonitrile and >1 V lower redox potential vs the aqueous counterpart; thus, the familiar aqueous catholyte becomes a new nonaqueous anolyte. The lowering of redox potential correlates with replacement of water by acetonitrile in the solvation shell of HCF, which can be traced to H-bond formation between water and cyanide ligands. Symmetric flow cells indicate exceptional stability of HCF polyanions in nonaqueous electrolytes and Nafion membranes completely block HCF crossover in full cells. Ion pairing of metal complexes with organic counterions can be effective for developing promising redoxmers for nonaqueous flow batteries.

Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advanced battery technologies research · Advanced Battery Materials and Technologies · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, United States

Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States

Department of Mechanical and Energy Engineering, Indiana University−Purdue University Indianapolis, Indianapolis, Indiana 46202, United States

School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States

Material Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States

School of Chemical Sciences and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States

Instituto de Ciencia de Materiales de Madrid, Madrid 20849, Spain

Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, United States

X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States

Argonne Collaborative Center for Energy Storage Science, Argonne National Laboratory, Lemont, Illinois 60439, United States

Funding

Division of Chemistry · Basic Energy Sciences · Laboratory Directed Research and Development · Office of Science · Argonne National Laboratory

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