Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

被引：21

作者：

Buelter, Heinz ^{[1
]}

Denuault, Guy ^{[1
,2
]}

Matefi-Tempfli, Stefan ^{[1
,3
]}

Matefi-Tempfli, Maria ^{[1
]}

Dosche, Carsten ^{[1
]}

Wittstock, Gunther ^{[1
]}

机构：

[1] Carl Von Ossietzky Univ Oldenburg, Dept Chem, D-26111 Oldenburg, Germany

[2] Univ Southampton, Dept Chem, Southampton SO17 1BJ, Hants, England

[3] Deggendorf Inst Technol, Fac Nat Sci & Ind Engn, European Campus Rottal Inn, D-84347 Pfarrkirchen, Germany

来源：

ELECTROCHIMICA ACTA | 2016年 / 222卷

关键词：

scanning electrochemical microscopy; nanostructured hematite electrodes; oxygen evolution reaction; alkaline water electrolysis; ALKALI HYDROXIDE SOLUTIONS; OXYGEN EVOLUTION REACTION; MESOPOROUS PLATINUM MICROELECTRODES; AUSTENITIC STAINLESS-STEEL; STEADY-STATE VOLTAMMETRY; REDOX COMPETITION MODE; FERRATE(VI) PRODUCTION; LOCALIZED CORROSION; HYDROGEN-PEROXIDE; AQUEOUS-SOLUTIONS;

D O I：

10.1016/j.electacta.2016.11.108

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Iron oxides in general and especially hematite, alpha-Fe2O3, have become promising materials for the alkaline water electrolysis and photoelectrochemical water splitting, respectively. In the present study electrocatalytic electrodes with a thin film of alpha-Fe2O3 and with vertically aligned alpha-Fe2O3 nanowires were prepared. Cyclic voltammograms of the alpha-Fe2O3 nanowires revealed differences including a series of three unreported cathodic signals when compared to previously published voltammograms for polycrystalline iron oxides. The generation-collection mode of scanning electrochemical microscopy (SECM) using nanostructured Pt microdisc probes was exploited to detect soluble reaction products formed at the voltammetric peaks of the alpha-Fe2O3 electrode. SECM tip-substrate voltammetry unexpectedly showed that the reduction of Fe-VI to Fe-III on the cathodic sweep is accompanied by significant O-2 evolution. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：1326 / 1334

页数：9

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