A rotating disk electrode study on catalytic activity of iron(II) phthalocyanine-modified electrodes for oxygen reduction in acidic media
A rotating disk electrode study on catalytic activity of iron(II) phthalocyanine-modified electrodes for oxygen reduction in acidic media
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DOI：
10.1007/s10008-019-04461-9
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发表时间：
2019-12
影响因子：
2.5
通讯作者：
T. Toyama;Shino Sato;K. Motobayashi;K. Uosaki;K. Ikeda
中科院分区：
文献类型：
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作者：
T. Toyama;Shino Sato;K. Motobayashi;K. Uosaki;K. Ikeda
采用旋转圆盘电极伏安法研究了金属大环在酸性介质中对氧还原反应的催化活性。采用不同末端吡啶和异氰化物基团的分子线将铁（II）酞菁（FePc）和钴（II）四苯基卟啉（CoTPP）固定在金表面。FePc的ORR行为受轴向配体的影响较大，而CoTPP只促进双电子反应，与轴向配体无关。吡啶固定的FePc在ORR条件下容易与表面分离，只有在高过电位下才能促进四电子反应。FePc与异氰酸酯的四电子反应活性更稳定，这是由于FePc对Fe中心离子的电子赋能更强。
Catalytic activity of monometric metal macrocycles for oxygen reduction reaction (ORR) was investigated using rotating disk electrode voltammetry in acidic media. Iron(II) phthalocyanines (FePc) and cobalt(II) tetraphenylporphyrins (CoTPP) were immobilized on Au surfaces through molecular wires with different terminal groups of pyridine and isocyanide. The measured ORR behavior of FePc was largely influenced by the axial ligand while CoTPP promoted only the two-electron reaction regardless of the axial ligand. The FePc immobilized with pyridine was easily detached from the surface under the ORR condition, and was able to promote the four-electron reaction only under the high overpotential application. The FePc with isocyanide was more stable with the activity for the four-electron reaction, due to stronger electron donation to Fe central ions.