Catalytic activity and stability of heat-treated iron phthalocyanines for the electroreduction of oxygen in polymer electrolyte fuel cells
Catalytic activity and stability of heat-treated iron phthalocyanines for the electroreduction of oxygen in polymer electrolyte fuel cells
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DOI：
10.1016/s0378-7753(96)02356-7
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发表时间：
1996-07
影响因子：
9.2
通讯作者：
G. Lalande;G. Faubert;R. Côté;D. Guay;J. Dodelet;Lt. Weng;P. Bertrand
中科院分区：
文献类型：
--
作者：
G. Lalande;G. Faubert;R. Côté;D. Guay;J. Dodelet;Lt. Weng;P. Bertrand
研究了酞菁铁（FePc）和四羧基酞菁铁（FePcTc）在炭黑(C)上的吸附。得到的FePc/C和FePcTc/C在100 ~ 1100℃的氩气中进行热处理，得到氧电还原催化剂。用旋转圆盘电极和聚合物电解质燃料电池测量了这些材料的电化学性能。这些性质与催化剂的体积和表面表征有关。最活跃的催化剂是未热解的FePcTc/C，但也是最不稳定的催化剂。只有在高热解温度（≥900℃）下得到的催化剂才具有活性和稳定性。在这些温度下，不再有铁N键，铁主要是被石墨包层包围的金属。与可逆氢电极（RHE）相比，FePcTc/C和FePc/C在1000°C下热解，在50°C条件下在燃料电池中放置10小时后，产生的电流分别为含有相同金属负载（2 wt.%）的商用Pt催化剂的37%和40%。
Iron phthalocyanine (FePc) and tetracarboxylic iron phthalocyanine (FePcTc) have been adsorbed on carbon black (C). The resulting FePc/C and FePcTc/C have been heat-treated in Ar at various temperatures ranging from 100 to 1100 °C to obtain catalysts for the electroreduction of oxygen. The electrochemical properties of these materials have been measured by rotating disk electrode and in polymer electrolyte fuel cells. These properties have been correlated with the bulk and surface characterizations of the catalysts. The most active catalyst is unpyrolyzed FePcTc/C but it is also the least stable one. The only catalysts which are active and stable are those obtained at high pyrolysis temperatures (≥ 900 °C). At those temperatures there is no FeN bond anymore, and Fe is mainly observed as a metal surrounded by a graphitic envelope. After 10 h in a fuel cell at 50 °C, 0.5 V versus reversible hydrogen electrode (RHE), FePcTc/C and FePc/C pyrolyzed at 1000 °C yielded currents 37 and 40% that of a commercial Pt catalyst containing the same metal loading (2 wt.%), respectively.