Electrochemical Behavior of Silver Halogenocomplexes in an Amide-Type Ionic Liquid

研究成果: Article査読

抄録

The electrode reactions of haloargentates were investigated in an aprotic and hydrophobic amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA) in the presence of the halide ions. Silver halides, AgX (X- = Cl-, Br-, and I-) were found to be soluble in BMPTFSA containing 0.5 M BMPX to form halogenocomplex, [AgX3]2-. The cathodic reduction of [AgX3]2- to metallic Ag was observed within the electrochemical potential window of the ionic liquid, while the reduction potential was lower than that in the ionic liquid in the absence of X-. The equilibrium potentials of [AgX3]2-/Ag were in the order of [AgCl3]2- > [AgBr3]2- > [AgI3]2-, probably reflecting the thermodynamic stability of the complexes. The diffusion coefficients of [AgCl3]2-, [AgBr3]2-, and [AgI3]2- were 2.5, 2.0, and 1.6 × 10-7 cm2 s-1, respectively. The morphology of deposits strongly depended on the reduction potential. The nucleation and growth mechanism of Ag deposition was considered to be progressive rather than instantaneous. Formation of Ag nanoparticles dispersed in the ionic liquids was confirmed after potentiostatic cathodic reduction at -2.5 V vs Ag|Ag(I) using a transmission electron microscope.

本文言語English
論文番号092502
ジャーナルJournal of the Electrochemical Society
169
9
DOI
出版ステータスPublished - 2022 9月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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