Gas Concentration Resistance Fitting Model for Industrial-Scale Solid Oxide Fuel Cells

IF 3.1 4区工程技术 Q3 ELECTROCHEMISTRY

Fuel Cells Pub Date : 2025-09-13 DOI:10.1002/fuce.70018

Jiting Jian, Shuxue Mei, Yucong Fan, Xiucheng Zhang, Yu Zhu, Shixue Wang

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引用次数: 0

Abstract

Industrial-scale solid oxide fuel cells (SOFCs) require a long operational lifespan to justify their high capital and installation costs while minimizing maintenance and downtime in industrial applications. Extending this lifespan requires a thorough investigation of their degradation mechanisms. Electrochemical impedance spectroscopy (EIS) is widely utilized to analyze SOFC degradation, with the distribution of relaxation times (DRTs) method applied alongside variations in gas flow rates at the anode and cathode, operating temperatures, and current densities. This approach helps identify the characteristic frequencies of gas concentration impedance, charge transfer impedance at both electrodes, and O²⁻ transport impedance. However, in industrial-scale SOFCs, due to overlapping time constants of gas conversion impedance and gas diffusion impedance, the DRT method struggles to differentiate between gas conversion and gas diffusion impedance within gas concentration impedance. Moreover, gas concentration impedance at the cathode can only be identified at low O₂ concentrations. To overcome these limitations, this study proposes a gas concentration resistance fitting model for industrial-scale SOFCs under limited gas supply conditions. The proposed model effectively isolates gas concentration resistance while addressing the shortcomings of the DRT method. Furthermore, it simplifies testing procedures for industrial-scale SOFCs and provides valuable insights for durability analysis and performance optimization.

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工业规模固体氧化物燃料电池气体浓度阻力拟合模型

工业规模的固体氧化物燃料电池（sofc）需要较长的使用寿命，以证明其高资本和安装成本是合理的，同时最大限度地减少工业应用中的维护和停机时间。延长这种寿命需要对它们的降解机制进行彻底的研究。电化学阻抗谱（EIS）被广泛用于分析SOFC降解，弛豫时间分布（DRTs）方法与阳极和阴极气体流速、工作温度和电流密度的变化一起应用。这种方法有助于确定气体浓度阻抗的特征频率，电极上的电荷转移阻抗和O2−传输阻抗。然而，在工业规模的sofc中，由于气体转换阻抗和气体扩散阻抗的时间常数重叠，DRT方法在气体浓度阻抗中难以区分气体转换阻抗和气体扩散阻抗。此外，阴极处的气体浓度阻抗只能在低氧浓度下识别。为了克服这些限制，本研究提出了在有限气体供应条件下工业规模sofc的气体浓度阻力拟合模型。该模型有效地隔离了气体浓度阻力，解决了DRT方法的不足。此外，它简化了工业规模sofc的测试程序，并为耐久性分析和性能优化提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fuel Cells 工程技术-电化学

CiteScore

5.80

自引率

3.60%

发文量

审稿时长

3.7 months

期刊介绍： This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.