A micro-nano porous oxide hybrid for efficient oxygen reduction in reduced-temperature solid oxide fuel cells.
Tremendous efforts to develop high-efficiency reduced-temperature (≤ 600°C) solid oxide fuel cells are motivated by their potentials for reduced materials cost, less engineering challenge, and better performance durability. A key obstacle to such fuel cells arises from sluggish oxygen reduction reaction kinetics on the cathodes. Here we reported that an oxide hybrid, featuring a nanoporous Sm(0.5)Sr(0.5)CoO(3-δ) (SSC) catalyst coating bonded onto the internal surface of a high-porosity La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O(3-δ) (LSGM) backbone, exhibited superior catalytic activity for oxygen reduction reactions and thereby yielded low interfacial resistances in air, e.g., 0.021 Ω cm(2) at 650°C and 0.043 Ω cm(2) at 600°C. We further demonstrated that such a micro-nano porous hybrid, adopted as the cathode in a thin LSGM electrolyte fuel cell, produced impressive power densities of 2.02 W cm(-2) at 650°C and 1.46 W cm(-2) at 600°C when operated on humidified hydrogen fuel and air oxidant.
CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics , Chinese Academy of Sciences (SICCAS), 1295 Dingxi Road, Shanghai 200050,  P. R. China.
Da Han
Xuejiao
X
Liu
Fanrong
F
Zeng
Jiqin
J
Qian
Tianzhi
T
Wu
Zhongliang
Z
Zhan
D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D004553:Electric Conductivity; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D005708:Gallium / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D058608:Nanopores / Q000648:ultrastructure; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D016062:Porosity; D015203:Reproducibility of Results; D012493:Samarium / Q000737:chemistry; D013324:Strontium / Q000737:chemistry; D013696:Temperature
D004573:Electrolytes; D010087:Oxides; D003035:Cobalt; D012493:Samarium; D007811:Lanthanum; D005708:Gallium; D008274:Magnesium; D010100:Oxygen; D013324:Strontium