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In Operando Visualization of the Electrochemical Formation of Liquid Polybromide Microdroplets

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [4];  [5];  [2];  [2];  [6];  [2]
  1. Georgia Institute of Technology, Atlanta, GA (United States); OSTI
  2. Georgia Institute of Technology, Atlanta, GA (United States)
  3. Texas Tech Univ., Lubbock, TX (United States)
  4. Georgia Institute of Technology, Atlanta, GA (United States); Univ. of Science and Technology of China, Hefei (China)
  5. Georgia Institute of Technology, Atlanta, GA (United States); Texas A & M Univ., College Station, TX (United States)
  6. Georgia Institute of Technology, Atlanta, GA (United States). Inst. for Electronics and Nanotechnology
Zinc–bromine flow batteries are promising for stationary energy storage, and bromine-complexing agents have been used to form phase-separated liquid polybromide products. However, an understanding of the dynamics of polybromide nucleation is limited due to the beam sensitivity and complexity of polybromides. Here we report an in operando platform composed of dark-field light microscopy and a transparent electrochemical cell to reveal the dynamics of polybromide formation in their native environment. Using our platform, we confirm and reveal the liquid nature, chemical composition, pinning effect (strong interaction with Pt), residual effect (residual charge products on the surface), self-discharging, and over-oxidation of the polybromide products. Overall, the results provide insights into the role of complexing agents and guide the future design of zinc–bromine flow batteries. Furthermore, our in operando platform can potentially be used to study sensitive species and phases in other electrochemical reactions.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-induced Evolution of Materials for Energy (UNCAGE-ME); Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012577
OSTI ID:
1767519
Alternate ID(s):
OSTI ID: 1579983
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 43 Vol. 58; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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