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《科学通报(英文版)》 2003-01
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Investigation of electron transfer across the ice/liquid interface by scanning electro- chemical microscopy

ZHANG Zhiquan1, SUN Peng1, GAO Zhao1 & SHAO Yuanhua1,2 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; 2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China Correspondence should be addressed to Shao Yuanhua (e-mail: yhshao@chem.pku.edu.cn)  
The study of interfacial electron transfer (ET) reaction between ferricinium (Fc+) produced in situ in 1,2-dichloroethane (DCE) and ferrocyanide in ice matrix under low temperatures by the scanning electrochemical microscopy (SECM) is reported. Tetrabutylammonium (TBA+) is used as the common ion (potential-determining ion) in both phases to control the interfacial potential difference. The potential drop across the liquid/liquid interface can be quantitatively adjusted by changing the ratio of concentra-tions of TBA+ between the two phases. The apparent hetero-geneous rate constants for Fc+ reduction by -46Fe(CN) at the interface under different temperatures have been ob-tained by a best-fit analysis, where the experimental ap-proach curves are fitted to the theoretical simulated curves. A sharp change has been observed for heterogeneous rate constants around the freezing point of the aqueous phase, which reflects the phase transition process.
【Fund】: This work was supported by the Chinese Acad-emy of Sciences (CAS); the National Natural Science Foundation of China (Grant No. 20173058) and the State Key Laboratory of Electro-analytical Chemistry.
【CateGory Index】: O657.1
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