Controllable synthesis of two-dimensional tungsten nitride nanosheets as electrocatalysts for oxygen reduction reaction

Abstract

A facile synthetic strategy was developed for insitu preparation of two-dimensional (2D) highly crystalline tungsten nitride (WN) nanosheets with controllable morphology as oxygen reduction reaction (ORR) catalysts. The dependence of the crystal structure and morphology of WN on K 2 SO 4 content, pH, and pyrolysis temperature was thoroughly examined. The electrocatalytic performance of WN toward ORR in an alkaline electrolyte indicated that K + plays an important role in the control of size and shape in the hydrothermal and nitridation process, thereby promoting the formation of plate-like WO 3 and 2D WN nanosheets. The WN nanosheets, with largely exposed edge sites, provide abundant catalytic active sites and allow fast charge transfer. Furthermore, they exhibit high stability for ORR and methanol tolerance.

Interfacial Charge Transfer between Silver Phosphate and W2N3 Induced by Nitrogen Vacancies Enhances Removal of β‐Lactam Antibiotics

“…(Figure 5e and Table S5, Supporting Information). [ 38 ] For pure W 2 N 3 ‐NV, the peak at binding energy of 35.23 and 37.68 eV was also assigned to the W 6+ 4f 7/2 and W 4f 5/2 of WO, respectively, which was induced by the ineluctable surface oxidation. [ 39 ] Compared with pure W 2 N 3 ‐NV, the peak intensity of WN decreased obviously and the signal of WO was significantly enhanced, which was due to the formation of WO bonds between the W from W 2 N 3 ‐NV and the O from Ag 3 PO 4 .…”

Pt embedded Ni3Se2@NiOOH core-shell dendrite-like nanoarrays on nickel as bifunctional electrocatalysts for overall water splitting

“…Unfortunately, their electrochemical properties are still far away from that of noble metal catalysts due to the limited active sites and poor electrical conductivity. Constructing heterogeneous catalysts becomes one of the most valid issues to improve their catalytic activity and stability [5, [15][16][17]. Recently, hybrid materials with the conjunction of transition metal oxides/hydroxides (TMO) and metal catalysts show great potential for electrocatalysis, due to the engineering surface electronic modulation arising from electron transfer between the fabricated nanointerfaces, thereby enhancing their catalytic performances [18][19][20][21][22].…”

Self-Assembly of Ultrathin Nanocrystals to Multidimensional Superstructures

“…Such superstructures behave as an outstanding medium for light propagation. , For instance, highly ordered 2D superstructures composed of gold or silver NCs have always attracted the attention of researchers for their utilization in solar energy conversion and plasmonic devices . A handful of tools and routes have been established for construction of 2D NC-based assemblies for a variety of applications, which include Langmuir–Blodgett technique (LBT), templated assembly, , solution-based synthesis of assembled structures, evaporation driven assembly, etc. The direct defectless arrangement of UTNCs on functional surfaces can be obtained by an epitaxial self-assembly method through interfacial modifications, as reported by Lin et al They used layered hybrid perovskite (LHP) materials as substrates and CTAB covered Au NCs as building blocks to construct 2D arrays on the LHP surface.…”