Reactivity of Nanostructured MnO2 in Alkaline Medium Studied with a Micro-Cavity Electrode: Effect of Synthesizing Temperature

被引：41

作者：

Benhaddad, L. ^{[1
]}

Makhloufi, L. ^{[1
]}

Messaoudi, B. ^{[1
]}

Rahmouni, K. ^{[2
]}

Takenouti, H. ^{[2
]}

机构：

[1] Univ A Mira, Dept Genie Procedes, LTMGP, Bejaia 06000, Algeria

[2] Univ Paris 06, UPMC, LISE, CNRS,UPR 15, F-75252 Paris 05, France

来源：

ACS APPLIED MATERIALS & INTERFACES | 2009年 / 1卷 / 02期

关键词：

hydrothermal processing; cyclic voltammetry; EIS; BET surface area; cavity microelectrode; CATHODIC REDUCTION MECHANISM; MANGANESE-DIOXIDE; OXYGEN REDUCTION; AQUEOUS-ELECTROLYTE; GAMMA-MNO2; OXIDES; CAPACITOR;

D O I：

10.1021/am800118y

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of syntheizing temperature of manganese dioxide (MnO2) powders on their electrochemical reactivity in 1 M KOH was investigated. These powders were prepared chemically by the hydrothermal method by oxidation of Mn2+ by ammonium peroxodisulphate. The observations by scanning electronic microscopy, energy dispersive X-ray analyses and transmission electron microscopy tecniques on MnO2 obtained at different temperatures show the formation of many nanometre scale sticks lumped together to form a spherical particle of several micrometers. The results obtained at different temperatures show the formation of many nanometer scale sticks lumped together to form a spherical particle of several micrometers. The results obtained by BET and BJH methods reeval mesoporous texture and MnO2 synthesized at 90 degrees C presents the largest expanded surface area. The electrochemical reactivity of these powders in 1 M KOH was characterized with microacvity electrode by cyclic voltammetry and electrochemical reativity of these powders in results illustrate that the nanostructured MnO2 powder synthesized at 90 degrees C shows the highest electrochemical reactivity in agreement with BET data. The X-ray powder diffraction identified the gamma. MnO2 known as the most reactive species.

引用

页码：424 / 432

页数：9

共 36 条

[1] Microporosity of heat-treated manganese dioxide [J].

Arnott, J. B. ;

Williams, R. P. ;

Pandolfo, A. G. ;

Donne, S. W. .

JOURNAL OF POWER SOURCES, 2007, 165 (02) :581-590

[2] Electrochemical reactivity of MnO2 in 1 M KOH studied by voltammetry and electrochemical impedance spectroscopy [J].

Benhaddad, L. ;

Makhloufi, L. ;

Messaoudi, B. ;

Rahmouni, K. ;

Takenouti, H. .

MATERIAUX & TECHNIQUES, 2007, 95 :405-410

[3]

BENHADDAD L, 2008, 5 INT C CHEM CAIR EG

[4] A hybrid activated carbon-manganese dioxide capacitor using a mild aqueous electrolyte [J].

Brousse, T ;

Toupin, M ;

Bélanger, D .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2004, 151 (04) :A614-A622

[5] CHARACTERIZATION WITH INELASTIC NEUTRON-SCATTERING OF VARIOUS PROTONIC SPECIES IN MANGANESE DIOXIDES [J].

CACHET, C ;

BELUSHKIN, A ;

NATKANIEC, I ;

LECERF, A ;

FILLAUX, F ;

YU, LT .

PHYSICA B, 1995, 213 :827-829

[6] Characterization of Mo-MnO catalyst for propane oxidative dehydrogenation [J].

Cadus, LE ;

Ferretti, O .

APPLIED CATALYSIS A-GENERAL, 2002, 233 (1-2) :239-253

[7] The mechanism of oxygen reduction on MnO2-catalyzed air cathode in alkaline solution [J].

Cao, YL ;

Yang, HX ;

Ai, XP ;

Xiao, LF .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2003, 557 :127-134

[8] Nanometer-sized zeolite X crystals: Use as photochemical hosts [J].

Castagnola, NB ;

Dutta, PK .

JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (10) :1696-1702

[9] STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF THE PROTON GAMMA-MNO2 SYSTEM [J].

CHABRE, Y ;

PANNETIER, J .

PROGRESS IN SOLID STATE CHEMISTRY, 1995, 23 (01) :1-130

[10] Sol-gel synthesis of layered birnessite-type manganese oxides [J].

Ching, S ;

Petrovay, DJ ;

Jorgensen, ML ;

Suib, SL .

INORGANIC CHEMISTRY, 1997, 36 (05) :883-890

← 1 2 3 4 →