Effect of operating temperature on ammonia decomposition behavior and cell performance of direct ammonia solid oxide fuel cells

被引：2

作者：

Ya, Yuchen ^{[1
]}

Xu, Yishu ^{[1
]}

Liu, Yimin ^{[1
]}

Sun, Boyu ^{[1
]}

Liu, Junjia ^{[1
]}

Cheng, Xiaobei ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Luoyu Rd 1037, Wuhan 430074, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2024年 / 91卷

基金：

中国国家自然科学基金;

关键词：

Electrode reaction kinetics; Ammonia decomposition; DA-SOFC; Distribution of relaxation time (DRT); SOFC CATHODE; COMPOSITE ELECTROLYTE; IMPEDANCE SPECTRA; OXYGEN REDUCTION; ANODE; MODEL; TRANSPORTATION; STABILITY; PROGRESS; ELECTROCHEMISTRY;

D O I：

10.1016/j.ijhydene.2024.10.195

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：

Direct ammonia solid oxide fuel cells (DA-SOFC) are regarded as a promising power generation technology. Nevertheless, the catalytic reaction of ammonia on the anode surface significantly affects DA-SOFC performance. This study explores the deterioration of DA-SOFC performance in the 550-700 degrees C and the interaction between NH3 decomposition and electrochemical reactions. The findings indicate that, at 550 degrees C, compared to H2, the reduction in power density of NH3 18.58% exceeds 4.56%t of NH3 d.s.g. (mixtures, 0.75H2 + 0.25N2). The anodic polarization impedance of NH3 exceeds that of H2 and NH3 d.s.g. by 51.1% and 28.9%, respectively. Cathode utilizing O2 has a dual impact on NH3 decomposition, at lower temperatures, oxidizing the anode's active site, decreasing NH3 decomposition rate, resulting in insufficient H2 supply, reducing electron transfer coefficient. Conversely, at higher temperatures, O2 promotes NH3 decomposition by boosting H2 consumption. However, more N2 is produced, increasing the concentration loss.

引用

页码：659 / 672

页数：14