Degradation study of substituted Iron phthalocyanine molecular electrocatalysts toward oxygen reduction reaction
Tian, Yue
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https://hdl.handle.net/2142/124720
Description
Title
Degradation study of substituted Iron phthalocyanine molecular electrocatalysts toward oxygen reduction reaction
Author(s)
Tian, Yue
Issue Date
2024-05-01
Director of Research (if dissertation) or Advisor (if thesis)
Zhang, Yingjie
Department of Study
Materials Science & Engineerng
Discipline
Materials Science & Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Raman spectroscopy
Electrocatalysts
Oxygen reduction reaction.
Abstract
Transition metal–heteroatoms–carbon (TM–H–C) material is one the most promising alternative non-precious metal catalysts towards oxygen reduction reaction (ORR). Among various TM–H–C catalysts, the Fe–N–C electrocatalysts using Iron (II) phthalocyanine molecules as precursor have been developed for years due to their excellent electrochemical activity. However, Fe–N–C electrocatalysts are limited by the degradation during ORR, which is their most critical bottleneck.
To study the degradation mechanism, spectroscopic characterization is required to obtain chemical compositional information, including structural change and intermediate formation. Moreover, the in-situ characterization techniques also play a critical role in the degradation mechanism research, to provide us with insights of the evolution of molecular catalysts during reaction. In this study, we employ in-situ electrochemical Raman spectroscopy to study the degradation of Iron (II) phthalocyanine molecular catalysts during ORR. Iron (II) phthalocyanine (FePc) molecular materials are ideal to study Fe-N-C electrocatalysts since they share the same structure of catalytic active sites. Besides, we also investigate into the substituent’s dependence on FePc stability and activity, to obtain more insights of how to further improve the electrocatalyst design.
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