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Enhanced hydrogen storage in sandwich-structured rGO/Co1−xS/rGO hybrid papers through hydrogen spillover
- Source :
- Journal of Power Sources. 358:93-100
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Reduced graphene oxide (rGO) based two-dimensional (2D) structures have been fabricated for electrochemical hydrogen storage. However, the effective transfer of atomic hydrogen to adjacent rGO surfaces is suppressed by binders, which are widely used in conventional electrochemical hydrogen storage electrodes, leading to a confining of the performance of rGO for hydrogen storage. As a proof of concept experiment, a novel strategy is developed to fabricate the binder-free sandwich-structured rGO/Co1−xS/rGO hybrid paper via facile ball milling and filtration process. Based on the structure investigation, Co1−xS is immobilized in the space between the individual rGO sheets by the creation of chemical “bridges” (C S bonds). Through the C S bonds, the atomic hydrogen is transferred from Co1−xS to rGO accompanying a C H chemical bond formation. When used as an electrode, the hybrid paper exhibits an improved hydrogen storage capacity of 3.82 wt% and, most importantly, significant cycling stability for up to 50 cycles. Excluding the direct hydrogen storage contribution from the Co1−xS in the hybrid paper, the hydrogen storage ability of rGO is enhanced by 10× through the spillover effects caused by the Co1−xS modifier.
- Subjects :
- Materials science
Hydrogen
Renewable Energy, Sustainability and the Environment
Graphene
Inorganic chemistry
Oxide
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Cobalt sulfide
0104 chemical sciences
law.invention
chemistry.chemical_compound
Hydrogen storage
chemistry
Chemical bond
law
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Hydrogen spillover
0210 nano-technology
Subjects
Details
- ISSN :
- 03787753
- Volume :
- 358
- Database :
- OpenAIRE
- Journal :
- Journal of Power Sources
- Accession number :
- edsair.doi...........e0d594987240bae05d1f9ebae872290b