Nitrogen‐doped Graphene Loaded with Cobalt Nanoparticles as Efficient Electrocatalysts for Oxygen Reduction Reaction

Abstract

Developing non‐noble‐metal electrocatalysts used for efficient oxygen reduction reactions (ORR) is greatly significant in the advancement of fuel cells. Herein, a novel electrocatalyst Co/N−G has been synthesized via simply pyrolyzing the mixture of amino phenanthroline (NH2‐Phen), graphene oxide and cobalt salt. The microstructure of the catalyst has been characterized by using HADDF‐STEM, XRD, Raman and XPS, the results indicate that the precursor complex has formed Co nanoparticle during the high‐temperature pyrolysis process. The obtained catalyst of Co/N−G shows relatively good ORR catalytic activity (E1/2=0.80 V) and almost 4e− oxygen reduction pathway in alkaline. In addition, the Co/N−G catalyst shows better methanol‐tolerant ability and longer‐term stability than Pt/C catalyst.

Mechanochemistry‐Driven Construction of Aza‐fused π‐Conjugated Networks Toward Enhanced Energy Storage

“…[42][43] The high-resolution N1s XPS spectrum indicated the presence of four different N-containing moieties, including pyridinic N located at 398.9 eV, pyrrolic N at 399.9 eV, quaternary N at 402.2 eV, and oxidized N at 404.7 eV. [44][45] Raman spectroscopy of Phen-CMP-0.12 exhibited G-band derived from the sp 2hybridized carbon-centered at 1587 cm -1 and D-band around 1337 cm -1 associated with the defects within the skeletons (Figure 2F). The I D /I G ratio was calculated to be 2.6 by fitting the spectra using the Voigt function.…”