Highly porous gallium oxide with a high CO2 affinity for the photocatalytic conversion of carbon dioxide into methane

Hang-ah Park; Jung Hoon Choi; Kyung Min Choi; Dong Ki Lee; Jeung Ku Kang

doi:10.1039/C2JM30337J

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Journal of Materials Chemistry

Issue 12, 2012

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Highly porous gallium oxide with a high CO₂ affinity for the photocatalytic conversion of carbon dioxide into methane

Hang-ah Park , Jung Hoon Choi , Kyung Min Choi , Dong Ki Lee and Jeung Ku Kang

J. Mater. Chem., 2012,22, 5304-5307

DOI: 10.1039/C2JM30337J
Received 17 Jan 2012, Accepted 03 Feb 2012
First published on the web 03 Feb 2012

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Highly porous gallium oxide was synthesized by reconstructing its surface and body with mesopores and macropores. For the first time, the efficient photocatalytic conversion of CO₂ into a high energy carrier, CH₄, using the porous gallium oxide was realized without any co-particle or sacrificial reagent. The enhanced photocatalytic activity is mainly attributed to the 300% higher CO₂ adsorption capacity, as well as the 200% increased surface area, compared to the bulk nanoparticles. Furthermore, we propose the new reaction pathway based on the result that the carbon dioxide was converted directly into methane without going through carbon monoxide intermediates.