Construction of a sp³/sp² Carbon Interface in 3D N‐Doped Nanocarbons for the Oxygen Reduction Reaction

Abstract

The development of highly efficient metal-free carbon electrocatalysts for the oxygen reduction reaction (ORR) is one very promising strategy for the exploitation and commercialization of renewable and clean energy,but this still remains as ignificant challenge.H erein, we demonstrate afacile approach to prepare three-dimensional (3D) N-doped carbon with as p 3 /sp 2 carbon interface derived from ionic liquids via as imple pyrolysis process.T he tunable hybrid sp 3 and sp 2 carbon composition and pore structures stem from the transformation of ionic liquids to polymerizedo rganics and introduction of aC om etal salt. Through tuning both composition and pores,t he 3D N-doped nanocarbon with ah igh sp 3 /sp 2 carbon ratio on the surface exhibits as uperior electrocatalytic performance for the ORR compared to that of the commercial Pt/C in Zn-air batteries.D ensity functional theory calculations suggest that the improved ORR performance can be ascribed to the existence of Ndopants at the sp 3 / sp 2 carbon interface,w hichc an lower the theoretical overpotential of the ORR.

Atomic Layer Deposition‐Assisted Fabrication of Co‐Nanoparticle/N‐Doped Carbon Nanotube Hybrids as Efficient Electrocatalysts for the Oxygen Evolution Reaction

“…attached to carbon atoms. [ 36 ] Noticeable changes in the fractions of sp 3 C–C and sp 2 C–C bonds were observed with increasing H 2 flow rate, i.e., the fraction of the former bonds decreased from 22% to 11%, whereas that of the latter bonds increased from 52% to 61% (Figure 2e). Given that delocalized π‐electrons are involved in sp 2 C–C bonding, the conductivity of the carbon matrix in Co/N‐CNTs increased with increasing H 2 flow rate, which facilitated electron transfer between the carbon support, Co nanoparticles, and reactive adsorbents to result in enhanced catalytic performance.…”

FeCo alloy@N-doped graphitized carbon as an efficient cocatalyst for enhanced photocatalytic H2 evolution by inducing accelerated charge transfer

“…Peaks at 458, 693, 752, 964, 1217 and 1294 cm À1 belong to the characteristic peaks of g-C 3 N 4 [33]. D-band (1312 cm À1 ) and G-band (1587 cm À1 ) in FCC10 are attributed to the defect-activated band and the sp 2 hybrid carbon material on the surface of FeCo@NGC nanoparticles, respectively [34]. The vertical peak heights of D-and G-bands are used to represent their Raman intensities, respectively, and the values of I D and I G and the proportion of I D /I G are obtained in the Raman spectra of FCC10 [35].…”

Structural Design and Synthesis of an SnO2@C@Co‐NC Composite as a High‐Performance Anode Material for Lithium‐Ion Batteries

“…The C 1s spectrum of SnO 2 @C (Figure d) was further deconvoluted into four peaks. The main peak centered at 284.8 eV is ascribed to sp 3 ‐hybridized C atoms, and that at 283.9 eV to sp 2 ‐hybridized C atoms . The pair of peaks centered at 287.0 and 289.2 eV are attributed to the functional groups in the conductive carbon shell of SnO 2 @C, such as C=O and O−C=O, respectively .…”