نتایج جستجو برای: nitrogen doped graphene
تعداد نتایج: 211138 فیلتر نتایج به سال:
Co0.9Cu0.1Si alloy was prepared by mechanical alloying method. Nitrogen-doped graphene (NG) and nitrogen–sulfur co-doped (NSG) were hydrothermal 5 wt% oxide, NG NSG doped into alloy, respectively, ball milling to improve the electrochemical hydrogen storage performance of composite material. X-ray diffraction scanning electron microscopy used characterize structure morphology material, LAND bat...
Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly (n-)doped graphene, we observe larger carrier multiplication factors (>3) and a significantly faster phonon-mediated cooling of the carriers back to equilibrium com...
Platinum-based catalysts represent a state of the art in the electrocatalysis of oxygen reduction reaction (ORR) from the point of view of their activity and durability in harnessing the chemical energy via direct electrochemical conversion. However, because platinum is both expensive and scarce, its widespread implementation in such clean energy applications is limited. Recent breakthroughs in...
Dopant concentration; Half-metal; Spin polarization; Graphene Abstract The singly B and N doped graphene systems are carefully studied. The highly concentrated dopants cause a spin polarization effect in the systems. The spin polarization limits are affirmed in the singly B and N doped graphene systems through periodic hybrid density functional theory studies. The spin polarization effects must...
A novel class of dibenzo-fused 1,9-diaza-9a-boraphenalenes featuring zigzag edges with a nitrogen-boron-nitrogen bonding pattern named NBN-dibenzophenalenes (NBN-DBPs) has been synthesized. Alternating nitrogen and boron atoms impart high chemical stability to these zigzag-edged polycyclic aromatic hydrocarbons (PAHs), and this motif even allows for postsynthetic modifications, as demonstrated ...
Chemically induced mobility gaps in graphene nanoribbons: a route for upscaling device performances.
We report a first-principles based study of mesoscopic quantum transport in chemically doped graphene nanoribbons with a width up to 10 nm. The occurrence of quasi-bound states related to boron impurities results in mobility gaps as large as 1 eV, driven by strong electron-hole asymmetrical backscattering phenomena. This phenomenon opens new ways to overcome current limitations of graphene-base...
Atom implantation in graphene or graphene nanoribbons offers a rich opportunity to tune the material structure and functional properties. In this study, zigzag graphene nanoribbons with Ti or Sn adatoms stabilised on a double carbon vacancy site are theoretically studied to investigate their sensitivity to sulfur-containing gases (H2S and SO2). Due to the abundance of oxygen in the atmosphere, ...
First, graphene is directly grown on nickel foil without additional catalysts by chemical vapor deposition (CVD). Next, the modified nitrogen-doping, and alumina deposited onto magnetron sputtering. The charge-specific capacity of N-doped higher than that since 2 Theta in situ XRD characteristic peaks for moves toward a lower angle (about 24) which smaller 25) graphene, then gap between layers ...
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