Interface engineering of hierarchical P-doped NiSe/2H-MoSe₂nanorod arrays for efficient hydrogen evolution

Abstract

Developing non-noble metal-based electrocatalysts with better activity and stability for hydrogen evolution reaction (HER) is crucial for the electrolysis of water. Herein, self-supported three-dimensional (3D) P-doped NiSe/2H-MoSe2 nanorod arrays (denoted...

Recent advances in molybdenum diselenide-based electrocatalysts: preparation and application in the hydrogen evolution reaction

“…Similarly, when P-NiSe/MoSe 2 @NF was employed as the alkaline HER catalyst, it indicated an excellent HER electrocatalytic performance with an overpotential of 43 mV at 10 mA cm −2 and a Tafel slope of 93.1 mV dec −1 , much lower than those of NiSe/MoSe 2 @NF (94 mV, 114.4 mV dec −1 ) and Ni x Se y @NF (135 mV, 145.3 mV dec −1 ). 104 Compared to the previously reported P-NiSe 2 /MoSe 2 (1-1)@CC (175 mV, 78 mV dec −1 ), 115 the overpotential is lower but the Tafel slope is slightly high, probably contributing to the effect of phase difference of nickel selenide and C substrate.…”

“…The porcelain boat was placed at the center of a tube furnace, heated to 350 °C at a heating rate of 5 °C min −1 , and kept at 350 °C for 2 h in the presence of 5% H 2 -Ar to afford the P-NiSe/MoSe 2 @NF composite. 104 As shown in Fig. 11a, the selenization and P doping of green NiMoO 4 nanorods grown on NF formed the P-NiSe/MoSe 2 @NF catalyst, which still preserved the uniformly distributed nanorods on NF (Fig.…”

“…Compared to the pristine structures MoSe 2 and WSe 2 , MoSe 2 @WSe 2 can immediately adsorb the H* and further accelerate the generation of H 2 , revealing an interfacial synergy effect, thus boosting the HER activity of MoSe 2 @WSe 2 in alkaline media. For P-NiSe/MoSe 2 , 104 P doping changed the electronic structure and accelerated electron transfer kinetics, and the interfacial engineering of NiSe/MoSe 2 generated abundant active sites. Their synergistic effect enabled P-NiSe/MoSe 2 to exhibit an excellent alkaline HER performance, which was confirmed by theoretical calculations including charge density, Gibbs free energy, and total electronic density (Fig.…”

Fe-Doped and Carbon Composite Multiphase Hetero-structured Catalysts Based on the Ion-Exchange Strategy for Seawater Electrolysis

“…For the Ni 2p 3/2 spectrum of Fe-NiMoSe@C (Figure d), the peaks at 856.94 and 855.61 eV are assigned to Ni 3+ and Ni 2+ in the Ni x Se y species, − respectively, while the peak at 852.60 eV is due to the metal produced by the NF substrate . It is noteworthy that the peaks of Fe-NiMoSe@C show a significant negative shift compared to the peaks of NiMoSe, which is due to the fact that the electronegativity of nickel (1.91) is larger than that of iron (1.83), and the transfer of electrons from iron to nickel leads to an increase in the electron density of nickel. , Similarly, in the Mo 3d spectrum (Figure e), the peaks of Fe-NiMoSe@C at 232.05 and 228.80 eV are shifted by about 0.2 eV toward a lower binding energy than those of NiMoSe, corresponding to Mo 4+ 3d 3/2 and Mo 4+ 3d 5/2 , respectively, while the peak at 230.00 eV is ascribed to Se 3s . In the Se 3d spectrum of Figure f, the peaks of Se 3d 3/2 and Se 3d 5/2 in Fe-NiMoSe@C are located at 55.30 and 54.40 e0 V, respectively, and show a significant positive shift compared to those of NiMoSe, while the two peaks located at 58.90 and 56.51 eV in Fe-NiMoSe@C correspond to SeO x and Se .…”

Electro-oxidation reconstitution of aluminium copper MOF-derived metal oxyhydroxides for a robust OER process

“…Functional materials for distinctly efficient hydrogen evolution reactions (HER) and oxygen evolution reactions (OER) attract considerable attention. [1][2][3][4][5][6] A highly active electrode material for the OER is urgently required because the OER has a sluggish kinetics as compared to the HER. Due to excellent oxygen evolution electrocatalytic performance, contemporary IrO 2 and RuO 2 , etc.…”