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The New Catalyst Turns Carbon Dioxide Into An Energy Source
Jan 23, 2018

January 15 learned from the University of Science and Technology of China, Hefei micro-scale National Institute of Physical Science and Chemistry and Materials Science and Technology Research Group Professor Zeng Jie sulfur-cadmium sulfide alloy with adjustable components nanorods as a catalyst, Efficient reduction of carbon dioxide to syngas. The catalyst of the sulfur-selenide cadmium alloy nanorods shows high activity and high stability in the carbon dioxide electro-reduction reaction and can control the composition ratio of the syngas to a large extent. The results recently published in the internationally renowned "Advanced Materials" magazine.

Syngas, a mixture of carbon monoxide and hydrogen, is an important synthetic feedstock in the petrochemical industry. For different chemical processes, the optimal proportion of syngas required is also different. Traditional methods for preparing syngas include the gasification of coal and the reforming of natural gas, which consume non-renewable energy sources. In contrast, the use of carbon dioxide and water as feedstocks to electrically reduce carbon dioxide in aqueous solution is an ideal method for the sustainable production of syngas. However, at present, it is very difficult to regulate the composition ratio of syngas to a large extent while ensuring the high current density of the catalyst for the current reduction of carbon dioxide.

In response to this problem, researchers using liquid phase synthesis technology, the recent design and synthesis of components adjustable CdS alloy nanorods catalyst. The researchers found that the higher the selenium content of the catalyst, the more hydrogen intermediates in the reaction, the higher the proportion of hydrogen components in the syngas product. Studies have shown that at overpotential -1.2 volts, the ratio of carbon monoxide to hydrogen in the product syngas can be freely adjusted between 4: 1 and 1: 4.

In addition, in the stability test of continuously using the catalyst for 10 hours, the current density remained basically stable, and the composition ratio of the product syngas remained substantially unchanged.