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Thermodynamic analysis of the performance of an irreversible ammonia-fed solid oxide fuel cell

Song Hanlin, Lu Zhanghao, Ma Zheshu, Guo Xinjia, Guo Qiulin

Archives of Thermodynamics

2024

Vol. 45, no 2

279--290

To investigate the performance of an irreversible direct ammonia-fed solid oxide fuel cell, the direct ammonia-fed solid oxide fuel cell based on oxygen ion conductivity was modeled using finite time thermodynamic theory. First, mathematical expressions for the output power, output efficiency, ecological objective function and ecological coefficient of performance of the direct ammonia-fed solid oxide fuel cell were derived. Further, the effects of parameters such as operating temperature, operating pressure, fuel utilization, and electrolyte thickness on the performance of direct ammonia-fed solid oxide fuel cell were numerically investigated. The results show that as the operating temperature of direct ammonia-fed solid oxide fuel cell increases, the performance of direct ammonia-fed solid oxide fuel cell including output power, output efficiency, ecological objective function and ecological coefficient of performance will be improved. Under certain conditions, increasing fuel utilization can improve output power, output efficiency and ecological performance. Increasing the electrolyte thickness will decrease the finite time thermodynamic performance of direct ammonia-fed solid oxide fuel cell. Moreover, the microstructure of the electrode also affects the performance of direct ammonia-fed solid oxide fuel cell, and the ecological objective function is increased by 16.9% when the electrode porosity is increased from 0.4 to 0.8.

Exergetic sustainability indicators of a polymer electrolyte membrane fuel cell at variable operating conditions

Xu Bing, Chen Yan, Ma Zheshu

Archives of Thermodynamics

2021

Vol. 42, no 1

183--204

Based on the exergetic sustainability indicators of polymer electrolyte membrane (PEM) fuel cell, this paper studied the effects of irreversibility of thermodynamics on some exergetic sustainability indicators of PEM fuel cell under changing operating temperature, operating pressure and current density. Some conclusions are drawn by analyzing the curves. As the operating temperature increases, the negative impact of PEM fuel cell on various parameters due to irreversibility decreases; As the operating pressure increases, the negative impact of PEM fuel cell on various parameters due to irreversibility decreases; On the other hand, with the increase of current density, the negative impact of the PEM fuel cell on various parameters due to irreversibility increases.