Hydrolysis rate of submicron Zn particles for solar H2 synthesis

被引：58

作者：

Ernst, Frank O. ^{[1
]}

Steinfeld, Aldo ^{[2
,3
]}

Pratsinis, Sotiris E. ^{[1
]}

机构：

[1] ETH, Dept Mech & Proc Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland

[2] ETH, Dept Mech & Proc Engn, Inst Energy Technol, CH-8092 Zurich, Switzerland

[3] Paul Scherrer Inst, Solar Technol Lab, CH-5232 Villigen, Switzerland

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2009年 / 34卷 / 03期

关键词：

Kinetics; Fast surface reaction; Slow parabolic rate; Zinc; Zinc oxide; Nanoparticle; Hydrolysis; Solar energy; Hydrogen; WATER-VAPOR; ZINC-OXIDE; DEFECT STRUCTURE; METALLIC ZINC; OXIDATION; KINETICS; HYDROGEN; POWDER; DIFFUSION; OXYGEN;

D O I：

10.1016/j.ijhydene.2008.11.098

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 hydrolysis rate of Zn particles by up to 50 mol% water vapor in Ar gas was measured by thermogravimetric analysis at atmospheric pressure and 330-360 degrees C and quantified by a core-shell model. An initial ZnO layer led to an initially linear conversion profile attributed to a fast surface reaction (half-order with respect to water vapor mole fraction, y) followed by a parabolic conversion profile independent of y but dependent on Zn ion diffusion through a ZnO layer. The latter is most important for solar H-2 formation by the Zn/ZnO water-splitting cycle as it determines the required process residence time for Zn hydrolysis. A ready-to-use equation for calculation of ZnO and H-2 formation during Zn hydrolysis is proposed and compared to literature data revealing enhanced hydrolysis rates for submicron Zn particles. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：1166 / 1175

页数：10

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