Controlled release of H2S and NO gases through CO2-stimulated anion exchange

Shinsuke Ishihara () and Nobuo Iyi ()
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Shinsuke Ishihara: National Institute for Materials Science (NIMS)
Nobuo Iyi: National Institute for Materials Science (NIMS)

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Difficulties related to handling gases are a common bottleneck for applications. Although solid materials that release gas molecules under external stimuli exist, they require an external energy or a device for reliable operation. Herein, we report a CO2 stimulus for controlled release of p.p.m.-level functional gases from solid materials. A CO2-preferential anion-exchange property of layered double hydroxides and redox reactions in gas molecules are combined to release various gases (including H2S and NO) under ambient air from HS− and NO2−-incorporated layered double hydroxides, respectively. The profiles of gas release are mainly governed by the difference of pKa between H2CO3 and resulting acids (formed through protonation of interlayer anions), and are not so susceptible to the variation of relative humidity in air. Moreover, structural modulation of solid materials enables fine control of the gas release profiles. The use of safe, ubiquitous, and nearly constant (~400 p.p.m. in atmosphere) CO2 stimulus offers broad applications for functional gases.

Date: 2020
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DOI: 10.1038/s41467-019-14270-3

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