Journal ArticleDOI
A high-performance cathode for the next generation of solid-oxide fuel cells
Zongping Shao,Sossina M. Haile +1 more
TLDR
BSCF is presented as a new cathode material for reduced-temperature SOFC operation and demonstrated that BSCF is ideally suited to ‘single-chamber’ fuel-cell operation, where anode and cathode reactions take place within the same physical chamber.Abstract:
Fuel cells directly and efficiently convert chemical energy to electrical energy. Of the various fuel cell types, solid-oxide fuel cells (SOFCs) combine the benefits of environmentally benign power generation with fuel flexibility. However, the necessity for high operating temperatures (800–1,000 °C) has resulted in high costs and materials compatibility challenges. As a consequence, significant effort has been devoted to the development of intermediate-temperature (500–700 °C) SOFCs. A key obstacle to reduced-temperature operation of SOFCs is the poor activity of traditional cathode materials for electrochemical reduction of oxygen in this temperature regime2. Here we present Ba_(0.5_Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-delta) (BSCF) as a new cathode material for reduced-temperature SOFC operation. BSCF, incorporated into a thin-film doped ceria fuel cell, exhibits high power densities (1,010 mW cm^(-2) and 402 mW cm^(-2) at 600 °C and 500 °C, respectively) when operated with humidified hydrogen as the fuel and air as the cathode gas. We further demonstrate that BSCF is ideally suited to 'single-chamber' fuel-cell operation, where anode and cathode reactions take place within the same physical chamber. The high power output of BSCF cathodes results from the high rate of oxygen diffusion through the material. By enabling operation at reduced temperatures, BSCF cathodes may result in widespread practical implementation of SOFCs.read more
Citations
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Journal ArticleDOI
Electrochemistry of Mixed Oxygen Ion and Electron Conducting Electrodes in Solid Electrolyte Cells
TL;DR: This work highlights the significant progress that has been made in elucidating these pathways through well-designed experimental and computational studies and reveals the nature of the rate-determining step(s) and enables rational design of materials with enhanced activity.
Journal ArticleDOI
Topotactic Metal-Insulator Transition in Epitaxial SrFeOx Thin Films.
Amit Khare,Dongwon Shin,Tae Sup Yoo,Minu Kim,Tae Dong Kang,Jaekwang Lee,Seulki Roh,In-Ho Jung,Jungseek Hwang,Sung Wng Kim,Tae Won Noh,Hiromichi Ohta,Woo Seok Choi +12 more
TL;DR: This study highlights the phase stability and reversibility of SrFeOx thin films, which is highly relevant for energy and environmental applications exploiting the redox reactions.
Journal ArticleDOI
A robust symmetrical electrode with layered perovskite structure for direct hydrocarbon solid oxide fuel cells: PrBa0.8Ca0.2Mn2O5+δ
Sihyok Choi,Sihyok Choi,Sivaprakash Sengodan,Sunhye Park,Young Wan Ju,Joonyoung Kim,Junji Hyodo,Hu Young Jeong,Tatsumi Ishihara,Jeeyoung Shin,Guntae Kim +10 more
TL;DR: In this article, the authors proposed a highly stable symmetrical SOFC electrode, a layered perovskite Ca doped PrBaMn2O5+δ (PBCMO), which is very high in a reducing atmosphere and suitable in an oxidizing atmosphere.
Journal ArticleDOI
Tuning the electrocatalysts for oxygen evolution reaction
Ali Eftekhari,Ali Eftekhari +1 more
TL;DR: In this article, the most reasonable design for the practical development of the OER electrocatalysts is based on a carbon catalyst support and transition metal compounds decorated by metallic catalysts.
Journal ArticleDOI
Advanced Fuel Cell Based on Perovskite La–SrTiO3 Semiconductor as the Electrolyte with Superoxide-Ion Conduction
Gang Chen,Bin Zhu,Bin Zhu,Hui Deng,Yadan Luo,Wenkang Sun,Hailiang Liu,Wei Zhang,Xunying Wang,Yumin Qian,Xianwei Hu,Shujiang Geng,Jung-Sik Kim +12 more
TL;DR: A novel approach is presented for using the semiconductor perovskite La0.25Sr0.75TiO3 (LST) as the electrolyte by creating surface superionic conduction, and the authors show that the LST electrolyte can deliver superior power density.
References
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Journal ArticleDOI
Materials for fuel-cell technologies
TL;DR: Recent progress in the search and development of innovative alternative materials in the development of fuel-cell stack is summarized.
Journal ArticleDOI
Appraisal of Ce1−yGdyO2−y/2 electrolytes for IT-SOFC operation at 500°C
TL;DR: In this article, the authors evaluated thermodynamic and electrical conductivity data to select the most appropriate electrolyte composition for IT-SOFC operation at 500°C and found that the Gd 3+ ion is the preferred dopant, compared to Sm 3+ and Y 3+, at this temperature.
Journal ArticleDOI
Investigation of the permeation behavior and stability of a Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxygen membrane
TL;DR: In this article, a combined citrate-EDTA complexing method was used for the preparation of SCFO and Ba0.2O3-delta (BSCFO) oxides, and the results of O-2-TPD and XRD showed that the introduction of barium into SCFO could effectively suppress the oxidation of Co3+ and Fe3+ to higher valence states of Co4 and Fe4+ in the lattice and stabilize the perovskite structure under lower oxygen partial pressures.
Journal ArticleDOI
Recent Advances in Materials for Fuel Cells
TL;DR: In this paper, material requirements for SOFC and PEMFC stacks, together with an introductory section on materials technology for reformers, are discussed, and it is concluded that the introduction of alternative materials/processes that would enable SOFC stacks to operate at 150-200°C, and IT-SOFC stacks at 500-700°C would have a major impact on the successful commercialization of fuel cell technology.
Journal ArticleDOI
A low-operating-temperature solid oxide fuel cell in hydrocarbon-Air mixtures
Takashi Hibino,Atsuko Hashimoto,Takao Inoue,Jun-ichi Tokuno,Shin-ichiro Yoshida,Mitsuru Sano +5 more
TL;DR: The performance of a single-chamber solid oxide fuel cell was studied using a ceria-basedsolid electrolyte at temperatures below 773 kelvin, where the solid electrolyte functioned as a purely ionic conductor.