|
ИСТИНА |
Войти в систему Регистрация |
ФНКЦ РР |
||
Proton transport in electrochemically reduced graphene oxide: Enhancing H+/H2O selectivityстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Chernova E.A., Brotsman V.A., Gurianov K.E., Eliseev Ar A., Valeev R.G., Kolesnik I.V., Chumakov A.P., Petukhov D.I., Eliseev An A.
- Журнал: Carbon
- Том: 213
- Год издания: 2023
- Издательство: Pergamon Press Ltd.
- Местоположение издательства: United Kingdom
- Номер статьи: 118288
- DOI: 10.1016/j.carbon.2023.118288
- Аннотация: Proton-selective membranes are prepared by electrochemical reduction of graphene oxide films in aqueous electrolytes. Rapid kinetics of oxygenated groups reduction was revealed by complementary FTIR- and XPS-spectroscopy giving rise to a partially reduced graphene oxide with C/O ratio in the range of 2–4. The reduction is accompanied by interstitial water loss and shrinkage of d-spacing from 1.15 nm, typical for graphene oxide, to graphene-like ∼0.36 nm as revealed by X-ray diffraction analysis. The presence of remaining oxygen groups in reduced graphene oxide enables fast transport of protons with Grotthuss hopping mechanism and diffusion coefficients in the range of 3–7∙10−11 m2 s−1 at 25 °C. At the same time, the reduction of GO layers hinders dramatically the transport of H2O molecules due to suppression of capillary condensation of water in the oxygen-deficient channels of the reduced graphene oxide providing the H+/H2O selectivity of up to 1400 upon electrochemical reduction. The suggested approach opens the avenue for the performance enhancement of carbon-based membranes for proton-selective transport in fuel cells and electrolyzers.
- Добавил в систему: Чернова Екатерина Александровна