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Updated: Aug 16, 2026

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
Published on: May 2, 2014
Pyridine polymer tubular structures connected with polyoxometalates as bifunctional electrocatalysts for water
Jihua Wang1,1, Hui Li1,1, Lige Gong1,1
1School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150080, China.
Abstract:
In this work, we successfully prepared four POM-based organic-inorganic hybrids, namely, [(C5H6N)2(C4H5N2)][PMo12O40] (1), [(C5H6N)3(C5H5N)][PMo12O40] (2), [(C3H6N8)3][PMo12O40]·4H2O (3), and [(C2H5N4)3][PMo12O40] (4) (where C5H6N = pyridine, C4H5N2 = pyrazine, C3H6N8 = 2,7-diamino-1,3,4,6,8,9-hexaazaspiro[4.4] nonane, and C2H5N4 = 3-amino-1,2,4-triazole), using a hydrothermal method. Compounds 1 and 2 exhibited a lamellar three-dimensional structure. Compared to compound 1, compound 2 contained only one ligand, pyridine, which formed a pyridine polymer tubular structure that was further connected to a [PMo12O40]3- anion, creating a pyridine-PMo12-pyridine stacking-like structure. Compounds 3 and 4 showed a stereostructure, where organic ligands were wrapped around polyacid spheres. Unlike compound 3, compound 4 maintained a similar three-dimensional structure but had a hexagonal astral ligand configuration. However, ligands formed hexagonal boxes that were smaller than those in compound 3, with shorter distances between the ligands. The overpotential values for compound 2 were 143 mV (HER) and 136 mV (OER) at 10 mA cm-2, which were significantly lower than those of the other compounds, the H3[PMo12O40] precursor, and the organic ligands. Given the relatively outstanding HER/OER catalytic properties of compound 2, a dual-electrode water-splitting device was assembled. The compound 2/CC∥compound 2/NF system achieved a low cell voltage of 1.48 V at 10 mA cm-2, which was significantly lower than that of the commercial Pt/C/CC∥RuO2/NF setup (1.5 V). In addition, compound 2/CC∥compound 2/NF exhibited rapid response capabilities and showed no significant increase in voltage after 6000 s of operation.
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