Study on anodic oxidation of magnesium in 6 M KOH solution by alternative current impedance

被引：22

作者：

Cai, Zongping ^{[1
,2
]}

Lu, Dongsheng ^{[1
,2
,3
]}

Li, Weishan ^{[1
,2
]}

Liang, Ying ^{[1
,2
]}

Zhou, Hebing ^{[1
,2
,3
]}

机构：

[1] S China Normal Univ, Dept Chem, Guangzhou 510006, Guangdong, Peoples R China

[2] S China Normal Univ, Guangdong Univ, Key Lab Electrochem Technol Energy Storage & Powe, Guangzhou 510631, Guangdong, Peoples R China

[3] S China Univ Technol, Coll Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2009年 / 34卷 / 01期

关键词：

Magnesium; Alkaline solution; Anodic oxidation; Mechanism; Alternative current impedance; HYDROGEN-STORAGE ALLOY; HYDRIDING COMBUSTION SYNTHESIS; CORROSION BEHAVIOR; PURE MAGNESIUM; CYCLE LIFE; MGNI; NI; ELECTRODES; BATTERIES; SPECTROSCOPY;

D O I：

10.1016/j.ijhydene.2008.09.087

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The result obtained from linear potential sweep indicates that magnesium in 6 M KOH solution behaves like an active-passive metal. The anodic oxidation process of magnesium and the interface structure between magnesium and solution were investigated by alternative current impedance analysis. It is found that when anodized, magnesium experiences active dissolution, passivation and secondary oxidation, In active region, magnesium dissolves actively, which is controlled by charge transfer step. In passive region, magnesium is passivated by the deposited Mg(OH)(2) but its oxidation controlled by charge transfer step still happens. In the secondary oxidation region, magnesium is oxidized directly to MgO, which is mix-controlled by charge transfer step and diffusion of water. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：467 / 472

页数：6

共 26 条

[1] CHARACTERISTICS OF MAGNESIUM-BASED HYDROGEN-STORAGE ALLOY ELECTRODES [J].

CUI, N ;

LUAN, B ;

LIU, HK ;

ZHAO, HJ ;

DOU, SX .

JOURNAL OF POWER SOURCES, 1995, 55 (02) :263-267

[2] Discharge behaviour of Mg2Ni-type hydrogen-storage alloy electrodes in 6 M KOH solution by electrochemical impedance spectroscopy [J].

Cui, N ;

Luan, B ;

Liu, HK ;

Dou, SX .

JOURNAL OF POWER SOURCES, 1996, 63 (02) :209-214

[3] Hydrogen production via hydrolysis reaction from ball-milled Mg-based materials [J].

Grosjean, MH ;

Zidoune, M ;

Roué, L ;

Huot, JY .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2006, 31 (01) :109-119

[4] THE METAL-COATING ELECTROLYTE INTERFACIAL IMPEDANCE AND ITS GLOBAL FRACTAL MODEL [J].

HUBRECHT, J ;

EMBRECHTS, M ;

BOGAERTS, W .

ELECTROCHIMICA ACTA, 1993, 38 (14) :1867-1875

[5] Enhancement of hydrogen storage in MgNi by Pd-coating [J].

Janot, R ;

Rougier, A ;

Aymard, L ;

Lenain, C ;

Herrera-Urbina, R ;

Nazri, GA ;

Tarascon, JM .

JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 356 :438-441

[6] ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (EIS) OF CORROSION PROCESSES ON INHOMOGENEOUS SURFACES [J].

JUTTNER, K .

ELECTROCHIMICA ACTA, 1990, 35 (10) :1501-1508

[7] Electrochemical properties of intermetallic compounds Mg2Ni, MgNi2, and the hydride Mg2Nih4 in 30% KOH solution [J].

Lavrenko, VA ;

Skorokhod, VV ;

Shvets, VA ;

Khomko, TV .

POWDER METALLURGY AND METAL CERAMICS, 2003, 42 (9-10) :523-529

[8] On the characterization of La1.5Mg17Ni0.5 composite materials prepared by hydriding combustion synthesis [J].

Li, Q ;

Lin, Q ;

Jiang, LJ ;

Chou, KC .

JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 368 (1-2) :101-105

[9] Chronopotentiometric responses and capacitance behaviors of passive film formed on iron in borate buffer solution [J].

Li, WS ;

Cai, SQ ;

Luo, JL .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2004, 151 (04) :B220-B226

[10] Mechanism of the high activity of Mg2NiH4 produced by hydriding combustion synthesis based on the analysis of phase composition, particle characteristic and grain size [J].

Liu, Dongming ;

Zhu, Yunfeng ;

Li, Liquan .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2007, 32 (13) :2455-2460

← 1 2 3 →