Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 32, Pages 18950-18958Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta03584b
Keywords
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Funding
- Basic Science Research Program through a National Research Foundation of Korea (NRF) - Korea government (MSIT) [2017R1C1B2012784, 2018R1A4A1025998, 2019R1A2C3009747]
- National Research Foundation of Korea [2019R1A2C3009747, 2017R1C1B2012784] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The dry reforming of methane (DRM) using CO2 for the production of syngas (H-2 and CO) has received increasing attention for reducing global CO2 emissions. The main drawback of DRM reactions is the limited reusability of the spent catalyst due to carbon deposition on its surface. Thus, designing an appropriate catalytic system is adequate to achieve increased syngas production with low carbon deposition, and developing smart strategies to reuse the carbon deposited spent catalyst is highly desirable. In this work, two dimensional siloxene sheet (silicon analog of graphene oxide) coated nickel foam is examined as a novel catalyst for the DRM reaction. The siloxene/Ni foam catalyst demonstrated superior catalytic performance in terms of conversion efficiencies (for CH4 and CO2) and syngas production (H-2 and CO) with a high H-2/CO ratio of 1.5. Further, the carbon deposited siloxene/Ni spent catalyst recovered after the DRM reaction was effectively re-utilized as electrodes for a symmetric supercapacitor (SSC) using an organic electrolyte. The fabricated SSC (using the spent catalyst as electrodes) delivered a high device capacitance (24.65 F g(-1)), high energy density (30.81 Wh kg(-1)), and high-power density (15 625 W kg(-1)) with a long cycle life. Considering that the estimated carbon cost for developing a supercapacitor electrode is about $15 per kilogram, our strategy to effectively reutilize the recovered carbon deposited spent catalyst for energy storage applications might be a promising and economical approach for utilization of the spent catalyst.
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