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Detection of the Sn(III) Intermediate and the Mechanism of the Sn(IV)/Sn(II) Electroreduction Reaction in Bromide Media by Cyclic Voltammetry and Scanning Electrochemical Microscopy

Title
Detection of the Sn(III) Intermediate and the Mechanism of the Sn(IV)/Sn(II) Electroreduction Reaction in Bromide Media by Cyclic Voltammetry and Scanning Electrochemical Microscopy
Other Titles
Sn(II) Electroreduction Reaction in Bromide Media by Cyclic Voltammetry and Scanning Electrochemical Microscopy
Author
장진호
Keywords
ELECTRON-TRANSFER; KINETIC DISCRIMINATION; 2-ELECTRON TRANSFER; REDUCTIVE CLEAVAGE; HYDROCHLORIC-ACID; GOLD ELECTRODES; RADICAL-CATION; BOND BREAKING; FLOW BATTERY; ADSORPTION
Issue Date
2014-01
Publisher
AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 권: 136 호: 1 페이지: 311-320
Abstract
Fast-scan cyclic voltammetry (CV) and scanning electrochemical microscopy (SECM) were used to investigate the reduction of Sn(IV) as the hexabromo complex ion in a 2 M HBr-4 M NaBr medium. CV at scan rates to 100 V/s and SECM indicated the reaction pathway involves ligand-coupled electron transfer via an ECEC-DISP process: (1) one-electron reduction of (SnBr62-)-Br-IV to (SnBr63-)-Br-III; (2) bromide dissociation of the reduced (SnBr63-)-Br-III to (SnBr52-)-Br-III; (3) disproportionation of the reduced 2Sn(III)Br(5)(2-) to (SnBr5-)-Br-IV and (SnBr53-)-Br-II; (4) one-electron reduction of (SnBr52-)-Br-III to (SnBr53-)-Br-II; (5) bromide dissociation from (SnBr5)-Br-II to (SnBr42-)-Br-II. The intermediate Sn(III) species was confirmed by SECM3-, where the Sn(III) generated at the Au tip was collected on a Au substrate in the tip generation/substrate collection mode when the distance between the tip and substrate was a few hundred nanometers.
URI
http://dx.doi.org/10.1021/ja409958ahttp://hdl.handle.net/20.500.11754/47712
ISSN
0002-7863
DOI
10.1021/ja409958a
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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