Issue 1, 2021

Hydrogen transport property of polymer-derived cobalt cation-doped amorphous silica

Abstract

The effect of the local structure of Co-doped amorphous silica on the hydrogen transport property was studied with the aim to improve the high-temperature hydrogen-permselectivity of microporous amorphous silica-based membranes. Co-Doped silica materials with measured Co/Si atomic ratios ranging from 0.01 to 0.18 were successfully synthesized through the polymer-derived ceramic (PDC) route. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analyses confirmed the amorphous state of the polymer-derived Co-doped silica, while both X-ray photoelectron and Fourier transform infrared (FT-IR) spectroscopy analyses revealed that the divalent Co cation (Co2+) modified the matrix amorphous silica network to form hydrogen-bonded silanol. After dehydration treatment at 500 °C in argon, hydrogen (H)/deuterium (D) isotope exchange behavior on the surface silanol groups (Si–OH/OD conversion) of the polymer-derived non-doped and Co-doped amorphous silica was in situ monitored by measuring diffuse reflectance infrared Fourier transform (DRIFT) spectra at 500 °C. The self-diffusion coefficient for OH/OD conversion of free silanol groups of non-doped silica was 6.1 × 10−15 m2 s−1, while that on the hydrogen bonded Si–OH was found to reach 15.6 × 10−15 m2 s−1 by Co-doping at the measured Co/Si atomic ratio of 0.05.The effect of the amount of Co2+ doping on the hydrogen transport property was further studied by scanning transmission electron microscopy and electron energy loss spectroscopy (STEM-EELS) analyses, and it was suggested that a rather small amount of Co-doping, i.e. Co/Si atomic ratio of 0.05 was effective for enhancing high-temperature hydrogen permeance through microporous amorphous silica-based membranes.

Graphical abstract: Hydrogen transport property of polymer-derived cobalt cation-doped amorphous silica

Supplementary files

Article information

Article type
Research Article
Submitted
26 Aug 2020
Accepted
20 Oct 2020
First published
21 Oct 2020

Inorg. Chem. Front., 2021,8, 90-99

Hydrogen transport property of polymer-derived cobalt cation-doped amorphous silica

S. Tada, S. Ando, T. Asaka, Y. Daiko, S. Honda, S. Bernard and Y. Iwamoto, Inorg. Chem. Front., 2021, 8, 90 DOI: 10.1039/D0QI01035A

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