Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (01): 89-93.doi: 10.3866/PKU.WHXB19930115

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Study on Redution of Methylene Blue by Long Path-Length thin-Layer Spectroelectrochemistry

Wang Xue-Lin; Song Li-Guo; Li Guan-Bin; Tang Yuan-Feng; Xi Zheng-Kai   

  1. Dept.of Applied Chemistry, Shandong Building Material University, Jinan 250022
  • Received:1991-09-17 Revised:1991-11-20 Published:1993-02-15
  • Contact: Wang Xue-Lin

Abstract: The electrochemical roduction of methylene blue has been studied by long path-length thin-layer spectroelectrochemical method. It was found that the reduction of methylene blue at SnO_2 electrode is a two electron transfer reversible process. The standard potential E(?) determined was 0.286 V(vs. SCE). The acid dissociation constants for the leuco methylene blue were obtained as pK_(α1)=5.18, pK_(α1)=6.03. The mechanism of electrode reaction has been proposed.

Key words: Long path-length thin-layer spectroelectrochemistry, Methylene blue, SnO2-film glass electrode