Proton transport in electrochemically reduced graphene oxide: Enhancing H+/H2O selectivity

被引：15

作者：

Chernova, E. A. ^{[1
]}

Brotsman, V. A. ^{[2
]}

Gurianov, K. E. ^{[1
]}

Eliseev, Ar. A. ^{[2
]}

Valeev, R. G. ^{[3
]}

Kolesnik, I. V. ^{[1
]}

Chumakov, A. P. ^{[4
]}

Petukhov, D. I. ^{[1
,2
]}

Eliseev, An. A. ^{[1
,2
]}

机构：

[1] Lomonosov Moscow State Univ, Dept Mat Sci, 1-73 Leninskiye Gory, Moscow 119991, Russia

[2] Lomonosov Moscow State Univ, Dept Chem, 1-3 Leninskiye Gory, Moscow 119991, Russia

[3] Russian Acad Sci UdmFRC UB RAS, Ural Brunch, Udmurt Fed Res Ctr, St Them Tatiana Baramzina 34, Izhevsk 426067, Russia

[4] European Synchrotron Radiat Facil, 71 Av Martyrs, F-38042 Grenoble, France

来源：

CARBON | 2023年 / 213卷

基金：

俄罗斯科学基金会;

关键词：

Graphene oxide membranes; Protons transport; Diffusion coefficients; H plus; H2O selectivity; Fuel cells; REDUCTION; MEMBRANES; WATER;

D O I：

10.1016/j.carbon.2023.118288

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 XPSspectroscopy 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 & BULL;10  11 m2 s  1 at 25 degrees 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.

引用

页数：10

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