Fe3+ stabilized 3D cross-linked glycine-melamine formaldehyde networks as precursor for highly efficient oxygen reduction catalyst in alkaline media

Zeolitic Imidazolate Framework-Derived Ordered Pt–Fe Intermetallic Electrocatalysts for High-Performance Zn-Air Batteries

“….22), which can be explained by the fact that the additional heat treatment and Pt deposition can lead to the evolution of the graphite structure to produce more defects and disordered surface regions. 35 Specially, the Pt nanocrystals deposited on carbon substrates occupied the defects and disordered structures for Pt/Fe−NC, which contributed to the sharp decrease for Pt/Fe−NC.…”

“…Besides, the intensity ratio of the D-band to G-band ( I D / I G ) could be conveniently utilized to estimate the number of defects and disordered structures in carbon substrates . From Figure D, the curves show that the I D / I G ratios increased when calcination temperature increased (Fe–NC, 1.12; Pt/Fe–NC-800, 1.18; Pt/Fe–NC-900, 1.20; Pt/Fe–NC-1000, 1.22), which can be explained by the fact that the additional heat treatment and Pt deposition can lead to the evolution of the graphite structure to produce more defects and disordered surface regions . Specially, the Pt nanocrystals deposited on carbon substrates occupied the defects and disordered structures for Pt/Fe–NC, which contributed to the sharp decrease for Pt/Fe–NC.…”