Proton conductivity of superacidic sulfated zirconia

被引：74

作者：

Hara, S ^{[1
]}

Miyayama, M ^{[1
]}

机构：

[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

来源：

SOLID STATE IONICS | 2004年 / 168卷 / 1-2期

关键词：

proton conductor; high proton conductivity; sulfated zirconia; superacid; surface SOx;

D O I：

10.1016/j.ssi.2004.01.030

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：

Three types of superacidic sulfated zirconia (S-ZrO2) were prepared by different methods using hydrated zirconia and sulfuric acid. Their proton conductivities were evaluated at 20-150 degreesC under saturated water vapor pressure. We found that the SOx concentration on S-ZrO2 varied largely depending on the method of preparation. The S/Zr atomic ratio changed from 0.046 for the sample prepared through a mixture of hydrated zirconia powder and sulfuric acid to 0.35 for the sample prepared through a mixture of hydrated zirconia sol and sulfuric acid. A powder compact of the former S-ZrO2 showed a proton conductivity of 4 x 10(-2) S cm(-1) at 70 degreesC and 8 x 10(-3) S cm(-1) at 150 degreesC, whereas that of the latter S-ZrO2 exhibited a high conductivity of 5 x 10(-2) S cm(-1) at 60-150 degreesC. Our experiment confirmed from IR spectra that there exists SOx bonded tightly with Zr on a heat-treated S-ZrO2 surface. The electronic polarization induced by such SOx was assumed to improve the Lewis and Bronsted acidities on Zr, leading to higher proton conductivities. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：111 / 116

页数：6

共 35 条

[1] Solid state protonic conductors, present main applications and future prospects [J].

Alberti, G ;

Casciola, M .

SOLID STATE IONICS, 2001, 145 (1-4) :3-16

[2] PREPARATION OF SUPERACIDS BY METAL-OXIDES AND THEIR CATALYTIC ACTION [J].

ARATA, K ;

HINO, M .

MATERIALS CHEMISTRY AND PHYSICS, 1990, 26 (3-4) :213-237

[3] Acidity, sulphur coverage and XPS analyses of ZrO2-SO4 powders by different procedures [J].

Ardizzone, S ;

Bianchi, CL .

APPLIED SURFACE SCIENCE, 1999, 152 (1-2) :63-69

[4] ACIDIC PROPERTIES OF SULFATED ZIRCONIA - AN INFRARED SPECTROSCOPIC STUDY [J].

BABOU, F ;

COUDURIER, G ;

VEDRINE, JC .

JOURNAL OF CATALYSIS, 1995, 152 (02) :341-349

[5] PROTONIC CONDUCTIVITY IN HYDRATES [J].

BARBOUX, P ;

MORINEAU, R ;

LIVAGE, J .

SOLID STATE IONICS, 1988, 27 (04) :221-225

[6] AN INFRARED STUDY OF SULFATED ZIRCONIA [J].

BENSITEL, M ;

SAUR, O ;

LAVALLEY, JC ;

MORROW, BA .

MATERIALS CHEMISTRY AND PHYSICS, 1988, 19 (1-2) :147-156

[7] SUPERACID AND CATALYTIC PROPERTIES OF SULFATED ZIRCONIA [J].

CHEN, FR ;

COUDURIER, G ;

JOLY, JF ;

VEDRINE, JC .

JOURNAL OF CATALYSIS, 1993, 143 (02) :616-626

[8]

COLOMBAN P, 1992, PROTON CONDUCTORS SO, P487

[9] Nafion® 115/zirconium phosphate composite membranes for operation of PEMFCs above 100 °C [J].

Costamagna, P ;

Yang, C ;

Bocarsly, AB ;

Srinivasan, S .

ELECTROCHIMICA ACTA, 2002, 47 (07) :1023-1033

[10]

England W. A., 1980, Solid State Ionics, V1, P231, DOI 10.1016/0167-2738(80)90007-7

← 1 2 3 4 →