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Direct electrochemical generation of supercooled sulfur microdroplets well below their melting temperature.
Liu, Nian; Zhou, Guangmin; Yang, Ankun; Yu, Xiaoyun; Shi, Feifei; Sun, Jie; Zhang, Jinsong; Liu, Bofei; Wu, Chun-Lan; Tao, Xinyong; Sun, Yongming; Cui, Yi; Chu, Steven.
Afiliação
  • Liu N; Department of Physics, Stanford University, Stanford, CA 94305; nian.liu@chbe.gatech.edu yicui@stanford.edu schu@stanford.edu.
  • Zhou G; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Yang A; School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332.
  • Yu X; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Shi F; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Sun J; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Zhang J; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Liu B; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Wu CL; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Tao X; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Sun Y; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Cui Y; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
  • Chu S; College of Materials Science and Engineering, Zhejiang University of Technology, 310014 Hangzhou, China.
Proc Natl Acad Sci U S A ; 116(3): 765-770, 2019 01 15.
Article em En | MEDLINE | ID: mdl-30602455
ABSTRACT
Supercooled liquid sulfur microdroplets were directly generated from polysulfide electrochemical oxidation on various metal-containing electrodes. The sulfur droplets remain liquid at 155 °C below sulfur's melting point (Tm = 115 °C), with fractional supercooling change (Tm - Tsc)/Tm larger than 0.40. In operando light microscopy captured the rapid merging and shape relaxation of sulfur droplets, indicating their liquid nature. Micropatterned electrode and electrochemical current allow precise control of the location and size of supercooled microdroplets, respectively. Using this platform, we initiated and observed the rapid solidification of supercooled sulfur microdroplets upon crystalline sulfur touching, which confirms supercooled sulfur's metastability at room temperature. In addition, the formation of liquid sulfur in electrochemical cell enriches lithium-sulfur-electrolyte phase diagram and potentially may create new opportunities for high-energy Li-S batteries.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Ano de publicação: 2019 Tipo de documento: Article
Texto completo
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Ano de publicação: 2019 Tipo de documento: Article