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Chelation Mediated Outer‐Sphere Electron Transfer for High‐Voltage and Long‐Lifespan Neutral Zinc‐Iron Flow Batteries.

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Title: Chelation Mediated Outer‐Sphere Electron Transfer for High‐Voltage and Long‐Lifespan Neutral Zinc‐Iron Flow Batteries.
Authors: Cao, Jinpeng1 (AUTHOR), Zhang, Hang2 (AUTHOR), Yu, Kaifeng1 (AUTHOR), Qu, Hongbo1 (AUTHOR), Liu, Bo3 (AUTHOR), Wang, Qing2 (AUTHOR) msewq@nus.edu.sg, Zhang, Feifei1 (AUTHOR) ffzhang@jlu.edu.cn, Yan, Junmin1 (AUTHOR) junminyan@jlu.edu.cn
Source: Advanced Energy Materials. May2026, Vol. 16 Issue 20, p1-11. 11p.
Subject Terms: *Chelation, *Oxidation-reduction potential, *Energy storage, *Flow batteries, *Oxidation-reduction reaction, *High voltages, *Durability
Abstract: Neutral zinc‐iron flow batteries (ZIFBs) are promising candidates for grid‐scale energy storage due to their safety, low cost, and sustainability. However, their cycle stability and energy density are restricted by zinc dendrite growth, hydrogen evolution, and more positive Zn anode potential in neutral media compared to alkaline conditions. Herein, we propose a ligand‐coordination strategy using tetrasodium iminodisuccinate (IDs) to rationally tune the redox behavior of Zn2+. The formation of a stable [H4Zn(C8H7NO8)2]2− complex converts the conversional Zn(H2O)62+ structure into a chelate‐dominated configuration, inducing an outer‐sphere electron transfer pathway by preventing direct Zn‐electrode interactions. Meanwhile, it results in a significant negative shift in redox potential of 350 mV (from −0.814 to −1.164 V vs. SHE), enabling a record‐high cell voltage of 1.63 V in neutral ZIFBs. The stabilized coordination environment facilitates highly reversible Zn plating/stripping while suppressing hydrogen evolution, dendrite formation and other side reactions. As a result, such high‐voltage ZIFB demonstrates a remarkable energy efficiency of 88.77% at 40 mA cm−2 and excellent cycling stability over 320 cycles, advancing durable and high‐performance neutral ZIFBs. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
FullText Text:
  Availability: 0
Header DbId: enr
DbLabel: Energy & Power Source
An: 194136186
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Chelation Mediated Outer‐Sphere Electron Transfer for High‐Voltage and Long‐Lifespan Neutral Zinc‐Iron Flow Batteries.
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Cao%2C+Jinpeng%22">Cao, Jinpeng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Hang%22">Zhang, Hang</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Kaifeng%22">Yu, Kaifeng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qu%2C+Hongbo%22">Qu, Hongbo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Bo%22">Liu, Bo</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Qing%22">Wang, Qing</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> msewq@nus.edu.sg</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Feifei%22">Zhang, Feifei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ffzhang@jlu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yan%2C+Junmin%22">Yan, Junmin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> junminyan@jlu.edu.cn</i>
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Advanced+Energy+Materials%22">Advanced Energy Materials</searchLink>. May2026, Vol. 16 Issue 20, p1-11. 11p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Chelation%22">Chelation</searchLink><br />*<searchLink fieldCode="DE" term="%22Oxidation-reduction+potential%22">Oxidation-reduction potential</searchLink><br />*<searchLink fieldCode="DE" term="%22Energy+storage%22">Energy storage</searchLink><br />*<searchLink fieldCode="DE" term="%22Flow+batteries%22">Flow batteries</searchLink><br />*<searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink><br />*<searchLink fieldCode="DE" term="%22High+voltages%22">High voltages</searchLink><br />*<searchLink fieldCode="DE" term="%22Durability%22">Durability</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Neutral zinc‐iron flow batteries (ZIFBs) are promising candidates for grid‐scale energy storage due to their safety, low cost, and sustainability. However, their cycle stability and energy density are restricted by zinc dendrite growth, hydrogen evolution, and more positive Zn anode potential in neutral media compared to alkaline conditions. Herein, we propose a ligand‐coordination strategy using tetrasodium iminodisuccinate (IDs) to rationally tune the redox behavior of Zn2+. The formation of a stable [H4Zn(C8H7NO8)2]2− complex converts the conversional Zn(H2O)62+ structure into a chelate‐dominated configuration, inducing an outer‐sphere electron transfer pathway by preventing direct Zn‐electrode interactions. Meanwhile, it results in a significant negative shift in redox potential of 350 mV (from −0.814 to −1.164 V vs. SHE), enabling a record‐high cell voltage of 1.63 V in neutral ZIFBs. The stabilized coordination environment facilitates highly reversible Zn plating/stripping while suppressing hydrogen evolution, dendrite formation and other side reactions. As a result, such high‐voltage ZIFB demonstrates a remarkable energy efficiency of 88.77% at 40 mA cm−2 and excellent cycling stability over 320 cycles, advancing durable and high‐performance neutral ZIFBs. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=194136186
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1002/aenm.70849
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 1
    Subjects:
      – SubjectFull: Chelation
        Type: general
      – SubjectFull: Oxidation-reduction potential
        Type: general
      – SubjectFull: Energy storage
        Type: general
      – SubjectFull: Flow batteries
        Type: general
      – SubjectFull: Oxidation-reduction reaction
        Type: general
      – SubjectFull: High voltages
        Type: general
      – SubjectFull: Durability
        Type: general
    Titles:
      – TitleFull: Chelation Mediated Outer‐Sphere Electron Transfer for High‐Voltage and Long‐Lifespan Neutral Zinc‐Iron Flow Batteries.
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            NameFull: Cao, Jinpeng
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            NameFull: Zhang, Hang
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            NameFull: Yu, Kaifeng
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            NameFull: Qu, Hongbo
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            NameFull: Liu, Bo
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            NameFull: Wang, Qing
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            NameFull: Zhang, Feifei
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            NameFull: Yan, Junmin
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            – D: 22
              M: 05
              Text: May2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 16146832
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              Value: 16
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            – TitleFull: Advanced Energy Materials
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