ACS Energy Letters · 2025 · 14 citations · 45 references
Natural SciencesChemical EngineeringMaterials ScienceCatalysisElectrochemical EngineeringElectrochemistryCathode MaterialsElectrochemical CellsElectrode MaterialsFuel Cell MaterialsFuel Cell MembranesFuel CellsCatalytic ActivityCatalytic Activity EnhancementElectron DensityFuel Cell Membrane DurabilityMembrane Electrode AssembliesMembrane PerformanceMetal DissolutionStability Enhancement
The stability enhancement of metal–nitrogen–carbon (M–N–C) is often inevitably accompanied by a loss of activity. Additionally, during the long-term operation, the activity frequently declines due to water flooding effects, significantly reducing the lifetime of the membrane electrode assembly (MEA). Herein, fluorine (F)-doping was employed to bypass the activity–stability trade-off of Fe–N–C catalysts. F incorporation increases the metal dissolution energy and lowers the electron density of Fe–N 4 sites, improving both stability and catalytic activity. Besides, the hydrophobicity of F can improve water management performance within the MEA, markedly reducing oxygen transport resistance. As a result, the F-doped Fe–N–C cathode enables a high peak power density of 1.1 W cm –2, far exceeding the Fe–N–C counterpart (0.79 W cm –2 ). More importantly, 90% of the power density can be retained after 30000 cycles of accelerated stress testing, demonstrating huge application potential in fuel cells.
45
Atomically dispersed Ni(i) as the active site for electrochemical CO2 reduction
Hong Bin Yang, Sung‐Fu Hung, Song Liu et al. · Nature Energy · 2018 · 2.2K citations