11510E500100 Seminar

TOPIC
▸　Bioinorganic Engineering of Dinitrosyl Iron Complexes (DNICs) and DNIC-derived Materials for Biomedical & Environmental Applications

❝　Recent advances in magnetically enhanced (electro)catalysis have disclosed the potential of magnetic fields to modulate reaction kinetics and catalytic performance. Herein, a combination of alternating magnetic field (AMF) as a physical stimulus, reduced graphene oxide (rGO) as a magneto-sensitizer, single-atom Fe on rGO (FeSA:rGO) as the catalytic active site, and H2O2 as dual reductant and oxidant demonstrated a proof-of-concept magneto-catalytic process that is thermodynamically driven solely by magneto-voltaic activity. Upon application of AMF to electroconductive FeSA:rGO, AMF-induced charge separation led to formation of low-lying electron holes (EHOMO = 2.41/2.43 eV) and excited electrons (ELUMO = -0.65/-0.57 eV), which triggered AMF power-dependent magneto-voltaic and magneto-electric activity (0.19-1.56 V and 0.15-0.62 mA). In the presence of H2O2, these AMF-induced low-lying electron holes in FeSA:rGO promoted oxidation of Fe3+ resting state leading to transient formation of a high-valent Fe4+ species, which served as a critical intermediate for magneto-catalytic oxidation of H2O2 and evolution of O2. Furthermore, kinetic study unveiled that FeSA:rGO concentration, H2O2 concentration, and AMF power played key roles in controlling the rates for FeSA:rGO-mediated magneto-catalytic oxygen evolution reaction. Consequently, these investigations established a mechanistic foundation for the future development of magneto-catalytic systems by integrating AMF-responsive magneto-sensitizers with diverse catalytic active sites.　❞

References
1.    C.-W. Chung, J.-Y. Huang, J.-G. Liang, T.-T. Lu, et al. Chem. Sci. 2026, 17, 1073-1097.
2.    C.-W. Chung, T.-T. Lu, et al. ACS Appl. Mater. Inter. 2022, 14, 6343-6357.
 

SPEAKER
▸　Prof. Tsai-Te Lu (*CV)
▸　Institute of Biomedical Engineering and Department of Chemistry, National Tsing Hua University

TIME
▸　2026/10/13 (TUE) 13:20 ~ 15:10

VENUE
▸　Classroom 215, Engineering Building 1