H2O splitting via a two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria redox reactions: Thermodynamic analysis

被引：16
|
作者：
Schieber, Garrett L. [1 ]
Stechel, Ellen B. [2 ,3 ]
Ambrosini, Andrea [4 ]
Miller, James E. [4 ]
Loutzenhiser, Peter G. [1 ]
机构：
[1] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA
[2] LightWorks, Tempe, AZ USA
[3] Arizona State Univ, Sch Mol Sci, Tempe, AZ 85281 USA
[4] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2017年 / 42卷 / 30期
关键词：
H-2; production; Ceria; Solar thermoelectrolytic cycle; THERMOCHEMICAL HYDROGEN-PRODUCTION; SYNGAS PRODUCTION; SYSTEM EFFICIENCY; WATER; CO2; CONVERSION; REDUCTION; HEAT;
D O I：
10.1016/j.ijhydene.2017.06.098
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：
H-2 production via a novel two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria reduction/oxidation reactions is thermodynamically analyzed. The two-step cycle encompasses (1) the solar thermoelectrolytic reduction of ceria using a combination of concentrated solar irradiation, reduced partial pressure, and electricity from a photovoltaic array to increase the oxygen vacancy concentration in the sublattice and (2) the non-solar oxidation of non-stoichiometric ceria with H2O to produce H-2, or CO2 to produce CO. The re-oxidized ceria is returned to the first step to complete the cycle. A thermodynamic analysis that imposes first and second law constraints to determine optimal performance predicts a solar-to-fuel efficiency of 31.1% for a reduction temperature of 1424 K and a maximum oxygen vacancy concentration of 0.229. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：18785 / 18793
页数：9
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