Efficient Visible-Light-Driven Hydrogen Production over Cu-Modified Polyoxotungstate Hybrids

Abstract

Hydrogen energy is a renewable and clean source, which makes a great difference in future sustainable energy systems. Visible-light-driven photocatalysis reaction involves harnessing the abundance of sunlight for hydrogen production among many catalytic technologies. However, the fabrication of photocatalysts that have distinctive performance in visible light is still the primary challenge. Herein, two new Cu-modified polyoxotungstate hybrids, {[Cu 2 (bim) 4 (H 2 O) 2 ](HBW 12 O 40 ) 2 •(H 2 bim) 2 •8H 2 O} (1) (bim = [1,1′-methylenebis(1H-imidazole)]) and {[Cu 2 (bim) 4 (H 2 O) 2 ](H 3 PW 10 Ti 2 O 40 ) 2 •(H 2 bim) 2 •8H 2 O} ( 2), have been successfully isolated by bridging two saturated Keggin polyoxotungstates and copper-azole complexes. Not surprisingly, 2 holds higher reduction activity due to the more negative charge and stronger basicity on the terminal oxygen of Ti�O and bridge oxygen of Ti−O−W. The H 2 yield was 17075 μmol g −1 h −1 for 2 in the tunable light-driven H 2 production system, which is promising in the field of photocatalysis.

Photo-, Thermo-, Electrochromic, Erasable Inkless Printing, Ions Detection, and UV Detector Properties of Viologen Compounds Based on Homomolybdate/Keggin POMs

“…In the CV curves of compounds 1 and 2 (Figures S23 and S24), we observed four pairs of reversible redox peaks, with the first two pairs attributed to the redox of Mo in β-Mo 8 and the last two pairs attributed to the redox of 1,4-cby. In the CV curve of compound 3 (Figure S25), five pairs of peaks were observed, with the first three pairs attributed to the redox of Mo in SiMo 12 and the second two pairs attributed to the redox of 1,4-cbyy. , CV curve results indicate that compounds 1 – 3 exhibit electrochemical activity during the redox process. Based on this characteristic, we have prepared a rigid electrochromic device based on compounds 1 – 3 ( 1 / 2 / 3 -ECD) (Figure ).…”

“…In the CV curve of compound 3 (Figure S25), five pairs of peaks were observed, with the first three pairs attributed to the redox of Mo in SiMo 12 and the second two pairs attributed to the redox of 1,4cbyy. 31,32 CV curve results indicate that compounds 1−3 exhibit electrochemical activity during the redox process. Based on this characteristic, we have prepared a rigid electrochromic device based on compounds 1−3 (1/2/3-ECD) (Figure 8).…”

Copper-containing POM-based hybrid P2Mo22V4Cu4 nanocluster as heterogeneous catalyst for the light-driven hydroxylation of benzene to phenol

“…In 2022, Zhu and colleagues synthesized a chain dimer structure formed by Cu-bim and Keggin-type polyoxometalates. 40 However, we use the Keggin-type (PMo 11 V 2 O 41 ) 4− anions to synthesize a crystal with different structures. The heteropoly acid anion in the compound is connected with Cu-2-( pyridin-2-yl)imidazole to form a centrally symmetrical dimer structure.…”

Kinetically and Thermodynamically Favorable Ni–Al Layered Double Hydroxide/Ni-Doped Zn0.5Cd0.5S S-Scheme Heterojunction Triggering Photocatalytic H2 Evolution

“…An appealing and sustainable approach for converting renewable solar energy into chemical energy that can be stored is called photocatalytic H 2 evolution (PHE). − Designing and constructing comparable photocatalysts are crucial steps in PHE. Very recently, layered double hydroxide (LDH) materials have emerged as promising photocatalysts for H 2 evolution. − Nevertheless, the low availability of photogenerated carriers of the single-phase LDH-based photocatalysts seriously limits their application. − To solve these issues, a multitude of strategies, including interfacial engineering, , defect control, , element doping, , morphology regulation, and construction of heterojunctions, , have been proposed to accelerate the separation and migration of carriers.…”