Polydopamine-modified graphene (G-PDA) materials were synthesized by in situ polymerization of a dopamine monomer on the surface of graphene oxide. X-ray photoelectron spectroscopy (XPS) has confirmed that new N-containing functional groups are formed during the synthesis process, which result in the excellent electrocatalytic activity of the composite towards ORR in terms of onset potential, number of electron transferred and limiting current density. The electrocatalytic activity of the optimized G-PDA sample is better than N-doped graphene and comparable to the commercial 20 wt% Pt/C catalyst. Furthermore, compared with the Pt-based catalysts, the G-PDA showed superior stability and methanol resistance, which favored its practical applications in fuel cells.
Keyphrases
- metal organic framework
- reduced graphene oxide
- highly efficient
- room temperature
- high resolution
- induced apoptosis
- carbon nanotubes
- walled carbon nanotubes
- gold nanoparticles
- quantum dots
- visible light
- carbon dioxide
- single molecule
- metabolic syndrome
- molecularly imprinted
- magnetic resonance
- cell proliferation
- human health
- computed tomography
- risk assessment
- transition metal
- oxidative stress
- signaling pathway
- endoplasmic reticulum stress
- uric acid