Mesh‐on‐Mesh Graphitic‐C₃N₄@Graphene for Highly Efficient Hydrogen Evolution

Abstract

Mesoporous materials have attracted considerable interest due to their huge surface areas and numerous active sites that can be effectively exploited in catalysis. Here, 2D mesoporous graphitic‐C3N4 nanolayers are rationally assembled on 2D mesoporous graphene sheets (g‐CN@G MMs) by in situ selective growth. Benefiting from an abundance of exposed edges and rich defects, fast electron transport, and a multipathway of charge and mass transport from a continuous interconnected mesh network, the mesh‐on‐mesh g‐CN@G MMs hybrid exhibits higher catalytic hydrogen evolution activity and stronger durability than most of the reported nonmetal catalysts and some metal‐based catalysts.

Encapsulating Co2P@C Core–Shell Nanoparticles in a Porous Carbon Sandwich as Dual‐Doped Electrocatalyst for Hydrogen Evolution

“…In general, the intensity of the D and G peaks represents the quantities of disordered and graphitized carbons; in addition, the intensity ratio of the sp 3 carbon to sp 2 carbon ( I D / I G ) can be used to evaluate the amount of disordered carbon or structural defects . The I D / I G ratio of Co 2 P@N,P‐C/C increased to 1.16, which indicated that more structural defects and disordered carbon were created by doping with N and P heteroatoms . Furthermore, the I D / I G ratio of Co 2 P@N,P‐C/CG was 1.03, which indicated a better graphitization degree after the introduction of the RGO.…”

Fabrication of Core‐Shell Ni2P@N, P−Co‐Doped Carbon/Reduced Graphene Oxide Composite as Anode Material for Lithium‐ and Sodium‐Ion Batteries

“…As shown in Figure b, the D and G bands of Ni 2 P@N, P−C/GN‐0.4 were found at 1355 and 1585 cm −1 . The stronger intensity ratio of Ni 2 P@N, P−C/GN‐0.4 ( I D / I G =1.08) than GO ( I D / I G =0.97) indicated the reduction from GO to GN, accompanying the increased structure defects and disorders in the composite . The nitrogen absorption and desorption curves of Ni 2 P@N, P−C/GN‐0.4 in Figure c were the type IV isotherm with a typical hysteresis loop, indicating the abundant mesopores in the sample.…”

Design of Graphene Nanoplatelet/Graphitic Carbon Nitride Heterojunctions by Vacuum Tube with Enhanced Photocatalytic and Electrochemical Response

“…Figure a shows the high‐resolution C 1s XPS spectra of GCN, GCNP, and GCNP 0.50 . The spectrum of GCNP 0.50 shows a C 1s peak at 285.5 eV, which represents sp 2 ‐hybridized carbon atoms bonded to nitrogen in aromatic form, and 289.1 eV, which represents tertiary carbon atoms attached to NH 2 [C–(N) 3 ] as compared with pure GNP (283.8 eV: sp 2 C–C; 286.7 eV; C–O, O–C=O) and GCN [284.5 eV: sp 2 C–C; 288.1 eV: C–(N) 3 ] . Figure b shows the N 1s spectra of photocatalysts GCN and GCNP 0.50 .…”

“…g‐C 3 N 4 and graphene, owing to their conductive and catalytic behaviors, would appear be good candidates for a composite . There are only a few reports in the literature relating to graphene/g‐C 3 N 4 composites . However, to the best of our knowledge, there is no report on the vacuum preparation of g‐C 3 N 4 /graphene nanoplatelet composites (GCNPs) for use in the photodegradation of tetracycline hydrochloride.…”