CO2 concentration effects on CO2/H2O co-electrolysis in a solid oxide electrolysis button cell

IF 2.6 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ionics Pub Date : 2025-06-09 DOI:10.1007/s11581-025-06438-3
Rahulkumar Shirasangi, Hari Prasad Dasari, M. B. Saidutta
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Abstract

The influence of CO2 gas concentration on the co-electrolysis performance of an electrolyte-supported button cell (NiO-YSZ/NiO-SDC/ScSZ/LSCF-GDC/LSCF) was investigated. At 800 oC/1.5V, the interfacial polarization resistance (Rp) values for 10%CO2/15%H2O and 30%CO2/15%H2O are 7.19 and 26.91 Ω.cm2, respectively. CO2 gas concentration significantly affects the Rp value. Gas diffusion resistance is dominant in the overall polarization resistance. As the CO2 concentration increases (10%→30%), H2 consumption increases, indicating RWGS dominance. For 30% CO2/15% H2O, CO2 out is slightly more than the input value due to the WGS and Boudouard reactions. As the applied voltage value increases from OCV, the H2 residue increases. H2O and CO2 co-electrolysis occurs at 1.5 V. The post-test XRD and Raman spectra results show NiO reduction and metallic Ni appearance. The post-test FE-SEM micrographs show no delamination at the air electrode/electrolyte interface, and carbon deposition is observed in the composite fuel electrode layer.

固体氧化物电解纽扣电池中CO2浓度对CO2/H2O共电解的影响
研究了CO2气体浓度对NiO-YSZ/NiO-SDC/ScSZ/LSCF- gdc /LSCF共电解性能的影响。在800 oC/1.5V时,10%CO2/15%H2O和30%CO2/15%H2O的界面极化电阻Rp值分别为7.19和26.91 Ω.cm2。CO2气体浓度对Rp值有显著影响。气体扩散阻力在整体极化阻力中占主导地位。随着CO2浓度的增加(10%→30%),H2消耗增加,表明RWGS占优势。在30% CO2/15% H2O条件下,由于WGS反应和Boudouard反应,CO2输出值略大于输入值。随着OCV施加电压值的增加,H2残留量增加。H2O和CO2共电解发生在1.5 V。测试后的XRD和拉曼光谱结果显示NiO还原和金属Ni外观。测试后的FE-SEM显微图显示,空气电极/电解质界面没有分层,复合燃料电极层中有碳沉积。
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来源期刊
Ionics
Ionics 化学-电化学
CiteScore
5.30
自引率
7.10%
发文量
427
审稿时长
2.2 months
期刊介绍: Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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