No.11 燃料電池カソード触媒としての窒素修飾溶剤抽出炭と灰分物質の役割(改質・処理・クリーン化(3))

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The development of alternative platinum electrode is demanded because of the scarcity of Pt resources and its high cost. Non-Pt catalysts synthesized from hypercoal were investigated as cathode catalyst for polymer electrolyte fuel cell. Hypercoal is an ash-free brown coal produced by solvent de-ashing technology. Elements of iron, aluminum, potassium, magnesium, calcium and silicon were added to hypercoal separately and being followed by nitridation to incorporate nitrogen into the hypercoal carbon structure and to form a composite precursor of nitrogen, carbon and metal as a catalyst for oxygen reduction reaction. A three electrode activity measurement with rotating ring disk method was applied to measure the electrochemical activity of the prepared catalysts. The catalysts were characterized by X-ray photoelectron spectroscopy, XRD, Raman spectroscopy and TEM analyses. The addition of iron and aluminum simultaneously to hypercoal and the consequent nitridation upgraded the performance of hypercoal as a cathode catalyst for oxygen reduction reaction. The 2% (Al+Fe) doped hypercoal exhibits an onset potential of 0.79 V with a current density of 0.286 mA/cm^2 at 0.6 V. The characterization studies indicate that pyridinic type nitrogen is associated with the formation of active sites for oxygen reduction reaction. Raman analysis shows that the higher degree of graphitization along the edge sites in catalyst structure facilitates the oxygen reduction.
2012-10-15

No.11 燃料電池カソード触媒としての窒素修飾溶剤抽出炭と灰分物質の役割(改質・処理・クリーン化(3))

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