Oxygen Vacancies and Interface Engineering on Amorphous/Crystalline CrO_x‐Ni₃N Heterostructures toward High‐Durability and Kinetically Accelerated Water Splitting

Abstract

and long-term durability over 500 h. Our findings highlight the accelerated water-splitting performance on the oxygen-vacancy and interface modulated catalysts and shed light on the fabrication of advanced heterostructures for other catalytic reactions. Figure 7. a) The schematic illustration of the CrO x -Ni 3 N for overall water splitting. b) The performance of the CrO x -Ni 3 N//CrO x -Ni 3 N and Ni 3 N//Ni 3 N for overall water splitting, the inset image shows the comparison of the needed voltage to drive 10 mA cm −2 for the CrO x -Ni 3 N//CrO x -Ni 3 N and Ni 3 N//Ni 3 N. c) The Faradaic efficiency testing device and d) the corresponding Faradaic efficiencies for HER and OER. e) Long-term stabilities of the CrO x -Ni 3 N//CrO x -Ni 3 N and Ni 3 N//Ni 3 N at 50 mA cm −2 .

Ni3N/Co4N nanosheet heterojunction electrocatalyst for hydrogen evolution reaction in alkaline fresh water/simulated seawater

“…Surface oxidation was also found in other HER electrocatalysts. 49,50 For Ni 3 N/Co 4 N, the Co binding energy of the Co–N bond shifts positively after HER testing (Fig. S4c and S5c†), which may arise from charge transfer of Co to the hydrogen intermediate on the catalyst.…”

High‐Alkaline Water‐Splitting Activity of Mesoporous 3D Heterostructures: An Amorphous‐Shell@Crystalline‐Core Nano‐Assembly of Co‐Ni‐Phosphate Ultrathin‐Nanosheets and V‐ Doped Cobalt‐Nitride Nanowires

“…DFT calculations were employed to investigate the modulation in the electronic structures resulting from the V‐doping and synergistic effect of the core and the shell materials in the amorphous‐shell@crystalline‐core heterostructures and their effect on the electrocatalytic activities for OER and HER in comparison to their crystalline‐core and amorphous shell counterparts ( Figure 8 , Figures S26–S33 , Supporting Information), similar to previous report. [ 79 ] The models representing crystalline Co 4 N and V‐doped Co 4 N core are shown in Figure S26 , Supporting Information, which reveals the significance of vanadium dopants in water adsorption. The adsorption energy of water on different doping concentrations of vanadium (V x% ‐Co 4 N, x = 1,3 and 5 at %) is found to be more favorable at the vanadium sites, as can be seen in Figure S27 , Supporting Information.…”

Electronic modulation of NiO by constructing an amorphous/crystalline heterophase to improve photocatalytic hydrogen evolution

“…3d, the deconvoluted O 1s spectra present three peaks at 530.4, 531.3 and 532.4 eV, which can be assigned to the Ni-O bonds, oxygen vacancies and adsorbed oxygen species on the surface, respectively. 52,53 In comparison with NiO-LAL, all the peaks of NiO 4 -CN in Ni 2p and O 1s spectra exhibit greatly positive shis, revealing electron redistribution and interfacial interaction. The XPS results conrm that there is not only physical adsorption between g-C 3 N 4 and NiO-LAL, but also electron transfer and interfacial interaction to assemble NiO 4 -CN composites, which is an essential factor in the promotion of photocatalytic performance possibly.…”