MoS₂/Ni₃S₂ nanorod arrays well-aligned on Ni foam: a 3D hierarchical efficient bifunctional catalytic electrode for overall water splitting

Abstract

A novel 3D hierarchical bifunctional catalytic electrode, MoS2/Ni3S2 nanorod arrays well-aligned on NF exhibited excellent electrocatalytic efficiency for hydrogen evolution reaction, oxygen evolution reaction and overall water splitting.

A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

“…S1 online), which is consistent with the TEM EDX results (Fig. 2d) [21,22]. The small peak at 235.7 eV is related to Mo 6+ , which suggests the weak oxidation of outer MoS 2 layer.…”

“…Such long and dense nanowires enable a high mass loading of catalysts of 34.9 mg cm À2 , which is over 2.7 times larger than those of the reported MoS 2 /Ni 3 S 2 heterostructure catalysts ( Fig. 1f, 7.6, 9.7 and 13 mg cm À2 ) [21][22][23], and thus a high current density is expected.…”

“…However, their electrocatalytic activity is unsatisfactory in alkaline solution. It has been reported that the heterostructure construction of MoS 2 with another catalyst like Ni 3 S 2 [21][22][23], CoS x [24,25], Co 3 O 4 [26] , Ni (OH) 2 [4] or Co(OH) 2 [5] can greatly improve the HER performance in alkaline solution due to the synergistic effects. Nevertheless, most studies generally focus on low current density such as 10 and 100 mA cm À2 .…”

In Situ Synthesis of Copper Sulfide‐Nickel Sulfide Arrays on Three‐Dimensional Nickel Foam for Overall Water Splitting

“…The two doublets appeared due to the presence of Ni 2+ and Ni 3+ states of Ni in Ni 3 S 2. In addition, an earlier report also suggests the peak emanating at ∼853 eV is a characteristic signature of Ni 3 S 2 and the satellite peaks at higher binding energies are ascribed to the surface oxides of nickel. On the other hand, resolved spectra of Cu 2p ( Figure c ) also indicate the two‐doublets at 932.3 eV and ∼952.2 eV belonging to Cu 2p 3/2 and Cu 2p 1/2 , respectively.…”

Crossed NiCo2S4 Nanowires Supported on Nickel Foam as a Bifunctional Catalyst for Efficient Overall Water Splitting

“…In recent years, earth‐abundant 3d transition metals and their derives including oxides, sulfides,, phosphides,, nitrides, and borides have been extensively studied as a favourable replacements for noble metals and innumerable materials owing to the incompletely filled d orbitals for readily donating and obtaining electrons, among them, chalcogenides have drawn considerable interest because of their superior catalytic activity and earth abundance . Since Zhou's group reported Ni 3 S 2 nanorods on Ni foam with excellent OER activity in alkaline electrolyte, much exciting progress toward metal sulfides such as Ni 3 S 2 , Co 9 S 8 , Co 3 S 4 , MoS 2 , and nickel cobalt sulfide (NiCo 2 S 4 ) have been achieved. Especially, NiS x‐ based nanomaterials showed excellent electrocatalytic performances for overall water splitting due to their high conductivity and intrinsic metallic.…”