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Title: Enhanced gas adsorption on graphitic substrates via defects and local curvature: A density functional theory study

Journal Article · · Journal of Physical Chemistry. C
DOI:https://doi.org/10.1021/jp411338a· OSTI ID:1325864
 [1];  [2];  [1];  [1];  [3]
  1. Indian Institute of Science, Bangalore (India)
  2. Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India)

Using van-der-Waals-corrected density functional theory calculations, we explore the possibility of engineering the local structure and morphology of high-surface-area graphene-derived materials to improve the uptake of methane and carbon dioxide for gas storage and sensing. We test the sensitivity of the gas adsorption energy to the introduction of native point defects, curvature, and the application of strain. The binding energy at topological point defect sites is inversely correlated with the number of missing carbon atoms, causing Stone–Wales defects to show the largest enhancement with respect to pristine graphene (~20%). Improvements of similar magnitude are observed at concavely curved surfaces in buckled graphene sheets under compressive strain, whereas tensile strain tends to weaken gas binding. Trends for CO2 and CH4 are similar, although CO2 binding is generally stronger by ~4 to 5 kJ mol–1. Furthermore, the differential between the adsorption of CO2 and CH4 is much higher on folded graphene sheets and at concave curvatures; this could possibly be leveraged for CH4/CO2 flow separation and gas-selective sensors.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1325864
Report Number(s):
LLNL-JRNL-643967
Journal Information:
Journal of Physical Chemistry. C, Vol. 118, Issue 15; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (7)

Integration of polymerized ionic liquid with graphene for enhanced CO 2 adsorption journal January 2015
Adsorption of sodium diclofenac on graphene: a combined experimental and theoretical study journal January 2016
Environmental applications of graphene-based nanomaterials journal January 2015
Amine-rich ionic liquid grafted graphene for sub-ambient carbon dioxide adsorption journal January 2016
An assessment of strategies for the development of solid-state adsorbents for vehicular hydrogen storage journal January 2018
Water self-diffusivity confined in graphene nanogap using molecular dynamics simulations journal November 2016
Universal roles of hydrogen in electrochemical performance of graphene: high rate capacity and atomistic origins journal November 2015

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