Cocatalyst free nickel sulphide nanostructure for enhanced photocatalytic hydrogen evolution

Review of Metal Sulfide Nanostructures and their Applications

“…124 Various synthesis methods such as microwave, solvothermal, hot injection, and hydrothermal have been explored to synthesize controlled phases of NiS. 120 These applications are attributed to their unique structure, high surface area, enhanced conductivity, redox activity, excellent capacitance performance high structural stability, low resistivity (∼1.2 × 10−4 Ω cm), low-cost high availability, good affinity toward dyes, electrostatic interaction, hydrogen bonding, surface/pore diffusion, coordination effect, and hydrophobic interaction. NiS has garnered a lot of interest due to its numerous uses in industries such as energy storage devices like supercapacitors and Li/Na/K ion batteries, electrocatalytic water splitting, dyesensitized solar cells, photocatalysts, and water treatment.…”

“…Specifically, pentlandite-type structures (Ni 9 S 8 ) have exhibited better hydrogen evolution reaction activities due to intrinsically high conductivity . Various synthesis methods such as microwave, solvothermal, hot injection, and hydrothermal have been explored to synthesize controlled phases of NiS . These applications are attributed to their unique structure, high surface area, enhanced conductivity, redox activity, excellent capacitance performance high structural stability, low resistivity (∼1.2 × 10–4 Ω cm), low-cost high availability, good affinity toward dyes, electrostatic interaction, hydrogen bonding, surface/pore diffusion, coordination effect, and hydrophobic interaction.…”

“…NiS exists in different phases such as α-NiS, β-NiS, NiS 2 , Ni 3 S 4 , Ni 3 S 2 , Ni 7 S 6 , and Ni 9 S 8 . The formation of different phases of NiS is highly dependent on the reaction temperature, time, reagent amount, and pH . Among these, two main phases are hexagonal α-NiS at high temperature and rhombohedral β-NiS at low temperature.…”

α-NiS–β-NiS growth on Cd0.5Zn0.5S formed Schottky heterojunctions for enhanced photocatalytic hydrogen production

“…This indicated that NiS loading cannot affect the crystal structure of Cd 0.5 Zn 0.5 S. For pure NiS (Fig. 1b), diffraction peaks were well indexed to α-NiS 32 (indexed to JCPDS No. 77-1624) and β-NiS 33 (indexed to JCPDS No.…”

Solar Fuel Production from Hydrogen Sulfide: An Upstream Energy Perspective

“…The reasons are the enhanced α-NiS absorption, better suited VB and CB alignment (1.66 and À0.17 V vs. NHE, E g = 1.83 eV) for H þ reduction, and the presence of defects in its structure, which act as photocatalytic reaction sites and nonradiative recombination centers. [96] Additionally, F À anion doping of Ni 3 S 2 was shown to strengthen the binding between H atoms and the material's surface, as well as accelerate water dissociation, thus improving H 2 production. [97] CdS-ZnS solid solutions are an emerging ternary metal sulfide with good photocatalytic activity, stability, and bandgap tunability through the Cd/Zn ratio.…”