Prominent roles of Ni(OH)₂ deposited on ZnIn₂S₄ microspheres in efficient charge separation and photocatalytic H₂ evolution

Abstract

The capture of the photogenerated holes by the deposited Ni(OH)2 contributes to the efficient charge separation, allowing more photogenerated electrons to be left on ZnIn2S4 to reduce H+ to H2.

Formation of p-n Heterojunctions by Incorporation of Mn2+ into the CdS Lattice toward Highly Efficient Photocatalytic H2 Evolution

“…Another pair of peaks located at 861.48 and 880.08 eV is in accordance with two shakeup satellite ones for Ni 2p 3/2 and Ni 2p 1/2 . These binding energies of Ni 2p match well the characteristics of Ni 2+ in Ni­(OH) 2 according to previous reports. , Furthermore, as shown in Figure S5a–5c, the deposition of Ni­(OH) 2 on Cd 1– x Mn x S ( x = 0.5) gives a slight shift in the binding energies of Cd 3d, Mn 2p, and S 2p in Cd 1– x Mn x S ( x = 0.5). The observed shifts support a strong interaction between the Ni­(OH) 2 and Cd 1– x Mn x S ( x = 0.5), which would benefits the charge transfer between them.…”

“…After the deposition of 5% Ni­(OH) 2 on the Cd 1– x Mn x S ( x = 0.5) sample, as observed in the HRTEM image of 5% Ni­(OH) 2 /Cd 1– x Mn x S ( x = 0.5) composite (Figure c), the nanoparticles with an interplanar spacing of 0.27 nm appears on the surface of the major phase CdS-hosted Cd 1– x Mn x S in Cd 1– x Mn x S ( x = 0.5). The interplanar spacing of 0.27 nm well corresponds to the interplanar distance for the crystallographic plane (100) of hexagonal Ni­(OH) 2 . , Moreover, the presence and homogeneous distribution of various elements in the selected area of these samples are also well demonstrated by the EDS mapping images (Figure S3).…”

“…The Ni­(OH) 2 modified Cd 1– x Mn x S ( x = 0.5) composites were fabricated by a facile in situ precipitation method . Briefly, 0.1 g of the as-prepared Cd 1– x Mn x S ( x = 0.5) sample was added into 50 mL of 0.25 M NaOH aqueous solution to form a homogeneous dispersion under continuous stirring, followed by the dropwise addition of Ni­(NO 3 ) 2 ·6H 2 O aqueous solution (0.05 M) with an appropriate amount.…”

Ni(OH)2 surface-modified hierarchical ZnIn2S4 nanosheets: dual photocatalytic application and mechanistic insights

“…34,36,41 Another consensus suggests that Ni(OH) 2 plays the prominent role of capturing photogenerated holes from the semiconductor, boosting charge transfer. 38 Based on these hypotheses, it is expected that the construction of Ni(OH) 2 –ZIS heterostructures may aid efficient photocatalytic FA oxidation coupled with H 2 production in water, while such an ensemble has not been achieved to date. Moreover, it is essential to get deeper insights into the issues regarding photogenerated charge capture and separation, as well as active sites, in the Ni(OH) 2 –semiconductor composites applied as catalysts for coupling reactions.…”

“…18,[30][31][32][33] Among them, Ni(OH) 2 , which features the merit of facile deposition, has attracted extensive attention. Specifically, Ni(OH) 2modified typical semiconductor materials, including Ni(OH) 2 / CdS nanorods, 34,35 Ni(OH) 2 /TiO 2 nanotubes, 36 Ni(OH) 2 /g-C 3 N 4 , 37 Ni(OH) 2 /ZIS nanoflowers 38,39 and Ni(OH) 2 /CdS/reduced graphene oxide ternary composite, 40 have been reported as costeffective photocatalysts for water splitting to produce H 2 . As for alcohol oxidation application, Liu et al reported the selective oxidation of benzyl alcohol using a Ni(OH) 2 -modified CdS-MoS 2 composite with significantly enhanced activity and selectivity.…”