Induced Potential in Porous Carbon Films through Water Vapor Absorption.
Angew Chem Int Ed Engl
; 55(28): 8003-7, 2016 07 04.
Article
em En
| MEDLINE
| ID: mdl-27159427
ABSTRACT
Sustainable electrical potential of tens of millivolts can be induced by water vapor adsorption on a piece of porous carbon film that has two sides with different functional group contents. Integrated experiments, and Monte Carlo and abâ
initio molecular dynamics simulations reveal that the induced potential originates from the nonhomogeneous distribution of functional groups along the film, especially carboxy groups. Sufficient adsorbed water molecules in porous carbon facilitate the release of protons from the carboxy groups, resulting in a potential drop across the carbon film because of the concentration difference of the released free protons on the two sides. The potential utilization of such a phenomenon is also demonstrated by a self-powered humidity sensor.
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MEDLINE
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En
Ano de publicação:
2016
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Article