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A metal-free highly torn amine functionalized nitrogen doped graphene (HT-AFNG) used as hydrogen evolution reaction (HER) catalyst is prepared by using a simple synthesis method involving the hydrothermal reaction of graphene oxide in the presence of ammonia and the subsequent ball milling. The metal-free HT-AFNG is efficient for the HER in the acid solution and can deliver an onset potential of 100 mV...
To enhance the electrocatalytic activity of heteroatom doped carbon for oxygen reduction reaction (ORR), high surface area and favorable porous structure are commonly required for providing sufficient accessible active sites. However, these features usually come with the severe carbon loss during pyrolysis and activation process. Herein, we report a facile self-terminated activation strategy for high-yield...
To distinguish defects in defective single-layer graphene (DSLG), we developed a method combining first principles density functional theory and tight-binding that quantifies defect-induced Raman intensities. Analysis of defect potentials for defects with vacancies and/or bond rotation has shown that on-site variation dominates the scattering, and also quantified effects of oxygen adsorption. Defect...
A simple strategy was developed for the preparation of a graphene oxide (GO) colloid with good water-solubility and stability by the reaction of graphite oxide with nitric acid. The as-prepared GO colloid was characterized by atomic force microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy. The results demonstrated that the...
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