Efficiency maximization in solar-thermochemical fuel production: challenging the concept of isothermal water splitting

被引:111
作者
Ermanoski, I. [1 ]
Miller, J. E. [1 ]
Allendorf, M. D. [2 ]
机构
[1] Sandia Natl Labs, Albuquerque, NM 87185 USA
[2] Sandia Natl Labs, Livermore, CA 94551 USA
基金
美国能源部;
关键词
THERMODYNAMIC PROPERTIES; CERIUM OXALATE; CO2; ENERGY; OXIDE; TEMPERATURE; HEAT; H-2;
D O I
10.1039/c4cp00978a
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
Widespread adoption of solar-thermochemical fuel production depends on its economic viability, largely driven by the efficiency of use of the available solar resource. Herein, we analyze the efficiency of two-step cycles for thermochemical hydrogen production, with emphasis on efficiency. Owing to water thermodynamics, isothermal H-2 production is shown to be impractical and inefficient, irrespective of reactor design or reactive oxide properties, but an optimal temperature difference between cycle steps, for which efficiency is the highest, can be determined for a wide range of other operating parameters. A combination of well-targeted pressure and temperature swing, rather than either individually, emerges as the most efficient mode of operation of a two-step thermochemical cycle for solar fuel production.
引用
收藏
页码:8418 / 8427
页数:10
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