No.59 エベネザ褐炭とベトナム無煙炭から燃料電池電極触媒の調製とカソード活性に及ぼす窒化処理と鉄添加効果(改質・処理・クリーン化(2))

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The development of non-Pt electrode is demanded because of the scarcity of Pt resources and its high cost. The purpose of this study is to search for highly active coal-derived electrocatalysts for the oxygen reduction reaction(ORR)activity as a cathode in a polymer electrolyte fuel cell. As a result of three-electrode electrochemical measurements on all the samples from various kinds of coals, Ebenezer brown coal nitride at 1123 K exhibited the highest ORR activity with the off-set potential of 0.85 V vs. RHE. In addition, Vietnam anthracite coal nitride at 1073 K after iron loading significantly improved the ORR activity with the off-set potential of 0.85 V vs. RHE. To understand the correlation between the activity and the nitrogen functional groups, the micropore surface area and the degree of structural disorder, we studied X-ray photoelectron spectroscopy, BET surface area and Raman spectroscopy, respectively. We suggest that the most probable active site of coal-derived electrocatalysts is the structure that two pyridinic nitrogen atoms substituted on the edge of graphene structure in micropores coordinate the iron.
2010-09-21