Synergistic effect of a noble metal free Ni(OH)₂ co-catalyst and a ternary ZnIn₂S₄/g-C₃N₄ heterojunction for enhanced visible light photocatalytic hydrogen evolution

Abstract

A plausible reaction mechanism for photocatalytic hydrogen production by employing a ZnIn2S4/g-C3N4@Ni(OH)2 heterojunction photocatalyst under visible light irradiation.

Construction of a hierarchical ZnIn2S4/C3N4 heterojunction for the enhanced photocatalytic degradation of tetracycline

“…65-2023). [35][36][37] The characteristic peaks of TCN were found at around 13.1°and 27.4°, which are associated with the (100) in-planar repeated units and (002) stacking layered structure, respectively. 38 The ZIS/TCN-3 composite displayed the characteristic signals of ZIS and TCN, Scheme 1 Schematic illustration of the synthesis process of ZIS/TCN heterojunctions.…”

“…For ZIS, the adsorption bands at 1613 and 1415 cm −1 correspond to surface-adsorbed H 2 O molecules and hydroxyl groups, respectively. 31,36 The broad peaks between 2900 and 3200 cm −1 in the TCN spectrum were ascribed to the N-H and O-H bands, associated with the terminations and absorbed H 2 O molecules, respectively. The peaks in the region of 1200-1650 cm −1 belong to the characteristic stretching vibration of C-N heterocycles.…”

“…Additionally, the peak at 811 cm −1 is attributed to the breathing mode of the triazine units. 36,39 After integration, the ZIS/TCN-3 composite had the typical stretching vibration modes of both ZIS and TCN. X-ray photoelectron spectroscopy (XPS) measurements were performed to examine the interfacial interactions between the ZIS and TCN components.…”

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

“…23 Following this work, hydroxides such as Ni(OH) 2 and Co(OH) 2 have been widely applied as cocatalysts for photocatalytic H 2 production by coupling with proper narrow band gap semiconductors including CdS, g-C 3 N 4 , and ZnIn 2 S 4 . [24][25][26][27][28][29] These works have well demonstrated that the hydroxides are capable of being alternatives for noble metal cocatalysts, and deserve more and further attention in photocatalytic H 2 production. Especially, the deepening of the knowledge of photogenerated charge transfer, capture, and active sites for H 2 production would be helpful for the design and optimization of hydroxide-modied photocatalysts.…”

Quantum dot-sensitized O-linked heptazine polymer photocatalyst for the metal-free visible light hydrogen generation

“…Molecular hydrogen (H 2 ) is considered as the most precious renewable and environment-friendly fuel due to the fact that it has high energy density and produces water as a by-product. [1][2][3][4][5][6][7] Visible light semiconductor-mediated photocatalytic water splitting is an inexpensive and environment friendly procedure for H 2 generation. [8][9][10][11][12] However, the use of expensive Pt as cocatalyst to bring down the overpotential of water splitting reaction raises the cost-related concerns for commercial applications.…”