TY - JOUR
T1 - Structural optimization of gas diffusion electrodes loaded with LaMnO 3 electrocatalysts
AU - Yuasa, Masayoshi
AU - Koga, Akiko
AU - Kida, Tetsuya
AU - Shimanoe, Kengo
AU - Yamazoe, Noboru
N1 - Funding Information:
Acknowledgment This study was supported by CREST of JST (Japanese Science and Technology Corporation).
PY - 2010/3
Y1 - 2010/3
N2 - In this study, gas diffusion electrodes (GDEs) with two catalyst layers were fabricated and tested for their electrode performance for oxygen reduction in an alkaline solution. The LaMnO3/carbon black catalyst layers were fabricated using a reverse micelle method to finely disperse the LaMnO 3 particles onto the carbon matrices, for which commercial Ketjen Black (KB) (1270 m2 g-1) and Vulcan XC-72R (VX) (254 m2 g-1) were used. The three-layer-structured GDE with the two LaMnO3/KB and LaMnO3/VX catalyst layers exhibited a superior oxygen reduction activity when compared to that of a conventional GDE with only one LaMnO3/KB catalyst layer. Pore size distribution and gas permeability measurements revealed that the LaMnO3/VX layer was more porous and had higher gas permeability than the LaMnO3/KB layer. These results suggest that the intermediate layer of LaMnO3/VX can efficiently supply oxygen to reaction sites dispersed in the LaMnO 3/KB and LaMnO3/VX catalyst layers, which consequently leads to an improvement in the electrode performance.
AB - In this study, gas diffusion electrodes (GDEs) with two catalyst layers were fabricated and tested for their electrode performance for oxygen reduction in an alkaline solution. The LaMnO3/carbon black catalyst layers were fabricated using a reverse micelle method to finely disperse the LaMnO 3 particles onto the carbon matrices, for which commercial Ketjen Black (KB) (1270 m2 g-1) and Vulcan XC-72R (VX) (254 m2 g-1) were used. The three-layer-structured GDE with the two LaMnO3/KB and LaMnO3/VX catalyst layers exhibited a superior oxygen reduction activity when compared to that of a conventional GDE with only one LaMnO3/KB catalyst layer. Pore size distribution and gas permeability measurements revealed that the LaMnO3/VX layer was more porous and had higher gas permeability than the LaMnO3/KB layer. These results suggest that the intermediate layer of LaMnO3/VX can efficiently supply oxygen to reaction sites dispersed in the LaMnO 3/KB and LaMnO3/VX catalyst layers, which consequently leads to an improvement in the electrode performance.
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U2 - 10.1007/s10800-009-0042-9
DO - 10.1007/s10800-009-0042-9
M3 - Article
AN - SCOPUS:77949265452
SN - 0021-891X
VL - 40
SP - 675
EP - 681
JO - Journal of Applied Electrochemistry
JF - Journal of Applied Electrochemistry
IS - 3
ER -