TY - JOUR
T1 - Facilitated oxygen transport through a Nafion membrane containing cobaltporphyrin as a fixed oxygen carrier
AU - Shoji, Masami
AU - Oyaizu, Kenichi
AU - Nishide, Hiroyuki
N1 - Funding Information:
This work was partially supported by Global COE Program “Practical Chemical Wisdom” and Super COE Program at Waseda University from MEXT, Japan. We thank Toyota Motor Co., Japan. The authors also acknowledge the GMT Membranetechnik, Germany, for providing the polyacrylonitrile porous support membrane.
PY - 2008/12/8
Y1 - 2008/12/8
N2 - A Nafion membrane containing a cobaltporphyrin (CoP) complex as a fixed oxygen carrier was prepared with a view to facilitate oxygen transport through the membrane. The design concept of the CoP-loaded Nafion membrane was based on the CoP's modification to place the CoP complex in a hydrophobic domain of the microphase-separated structure, in order to facilitate the oxygen transport and to maintain proton conductivity. The oxygen permeability through the CoP-loaded Nafion membrane was higher than the nitrogen permeability, and significantly enhanced at relatively-low oxygen pressures of the upstream, indicating that the fixed CoP complex acted as an oxygen hopping site to facilitate the oxygen transport. The oxygen/nitrogen permselectivity increased with the content of CoP in the Nafion membrane. Electrochemical reduction of oxygen at a glassy carbon electrode, modified with a Pt/C catalyst and the CoP-loaded Nafion membrane, provided additional support for the facilitated oxygen transport by the membrane. Increased current for the reduction of oxygen on the modified electrode by loading CoP indicated that the CoP offered the oxygen hopping site in the Nafion membrane.
AB - A Nafion membrane containing a cobaltporphyrin (CoP) complex as a fixed oxygen carrier was prepared with a view to facilitate oxygen transport through the membrane. The design concept of the CoP-loaded Nafion membrane was based on the CoP's modification to place the CoP complex in a hydrophobic domain of the microphase-separated structure, in order to facilitate the oxygen transport and to maintain proton conductivity. The oxygen permeability through the CoP-loaded Nafion membrane was higher than the nitrogen permeability, and significantly enhanced at relatively-low oxygen pressures of the upstream, indicating that the fixed CoP complex acted as an oxygen hopping site to facilitate the oxygen transport. The oxygen/nitrogen permselectivity increased with the content of CoP in the Nafion membrane. Electrochemical reduction of oxygen at a glassy carbon electrode, modified with a Pt/C catalyst and the CoP-loaded Nafion membrane, provided additional support for the facilitated oxygen transport by the membrane. Increased current for the reduction of oxygen on the modified electrode by loading CoP indicated that the CoP offered the oxygen hopping site in the Nafion membrane.
KW - Facilitated transport
KW - Nafion membrane
KW - Oxygen separation
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U2 - 10.1016/j.polymer.2008.10.016
DO - 10.1016/j.polymer.2008.10.016
M3 - Article
AN - SCOPUS:56349150865
SN - 0032-3861
VL - 49
SP - 5659
EP - 5664
JO - Polymer (United Kingdom)
JF - Polymer (United Kingdom)
IS - 26
ER -