Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials
In this work, activated graphene-like materials were obtained by varying both, the ratio of activated agent/graphene precursor and the activation temperature. The resulting materials were then characterized, resulting in higher values of specific surface area (SSA) when increasing the impregnation ratio at each temperature, reaching values up to 1325 m2 g−1. Gravimetric capacitances ranging between 11.0 and 49.0 F g−1 when charging/discharging at 0.5 A g-1 were obtained. The highest capacitance value was achieved not for samples with the highest SSA but with a micropore volume up to ~ 63 % of total pore volume. Overall, the capacitance values decreased significantly at activation temperatures of 600 and 700 °C at 2:1 and 4:1 impregnation ratios, regardless of an enhanced SSA, which could be explained considering the release of surface oxygenated functional groups during the thermal treatment. These results present the activated graphene materials as promising electrodes in energy storage devices.
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2021-01-01
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dig-incar-es-10261-2608322022-02-16T07:06:09Z Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials Quintero, Y. Herrera, S. Zapata-Benabithe, Z. Arango, D. Santamaría Ramírez, Ricardo González Arias, Zoraida Cruz, L. Santamaría Ramírez, Ricardo [0000-0001-9818-6998] González Arias, Zoraida [0000-0001-8932-3671] In this work, activated graphene-like materials were obtained by varying both, the ratio of activated agent/graphene precursor and the activation temperature. The resulting materials were then characterized, resulting in higher values of specific surface area (SSA) when increasing the impregnation ratio at each temperature, reaching values up to 1325 m2 g−1. Gravimetric capacitances ranging between 11.0 and 49.0 F g−1 when charging/discharging at 0.5 A g-1 were obtained. The highest capacitance value was achieved not for samples with the highest SSA but with a micropore volume up to ~ 63 % of total pore volume. Overall, the capacitance values decreased significantly at activation temperatures of 600 and 700 °C at 2:1 and 4:1 impregnation ratios, regardless of an enhanced SSA, which could be explained considering the release of surface oxygenated functional groups during the thermal treatment. These results present the activated graphene materials as promising electrodes in energy storage devices. The authors would like to thank financial support from Minciencias, Colombia (project No. 121071552608), and CIDI-UPB, and to INCAR-CSIC for the technical and scientific support. Peer reviewed 2022-02-15T08:45:35Z 2022-02-15T08:45:35Z 2021-01-01 comunicación de congreso http://purl.org/coar/resource_type/c_5794 ECS Transactions 100(1): 13-26 (2021) 9781607689102 1938-6737 http://hdl.handle.net/10261/260832 10.1149/10001.0013ecst 2-s2.0-85101435336 https://api.elsevier.com/content/abstract/scopus_id/85101435336 en ECS Transactions Postprint https://doi.org/10.1149/10001.0013ecst Sí open Institute of Physics Publishing |
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In this work, activated graphene-like materials were obtained by varying both, the ratio of activated agent/graphene precursor and the activation temperature. The resulting materials were then characterized, resulting in higher values of specific surface area (SSA) when increasing the impregnation ratio at each temperature, reaching values up to 1325 m2 g−1. Gravimetric capacitances ranging between 11.0 and 49.0 F g−1 when charging/discharging at 0.5 A g-1 were obtained. The highest capacitance value was achieved not for samples with the highest SSA but with a micropore volume up to ~ 63 % of total pore volume. Overall, the capacitance values decreased significantly at activation temperatures of 600 and 700 °C at 2:1 and 4:1 impregnation ratios, regardless of an enhanced SSA, which could be explained considering the release of surface oxygenated functional groups during the thermal treatment. These results present the activated graphene materials as promising electrodes in energy storage devices. |
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Santamaría Ramírez, Ricardo [0000-0001-9818-6998] |
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Santamaría Ramírez, Ricardo [0000-0001-9818-6998] Quintero, Y. Herrera, S. Zapata-Benabithe, Z. Arango, D. Santamaría Ramírez, Ricardo González Arias, Zoraida Cruz, L. |
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comunicación de congreso |
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Quintero, Y. Herrera, S. Zapata-Benabithe, Z. Arango, D. Santamaría Ramírez, Ricardo González Arias, Zoraida Cruz, L. |
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Quintero, Y. Herrera, S. Zapata-Benabithe, Z. Arango, D. Santamaría Ramírez, Ricardo González Arias, Zoraida Cruz, L. Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials |
author_sort |
Quintero, Y. |
title |
Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials |
title_short |
Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials |
title_full |
Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials |
title_fullStr |
Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials |
title_full_unstemmed |
Influence of the activation parameters on the electrochemical performance of chemically activated graphene materials |
title_sort |
influence of the activation parameters on the electrochemical performance of chemically activated graphene materials |
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Institute of Physics Publishing |
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2021-01-01 |
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http://hdl.handle.net/10261/260832 https://api.elsevier.com/content/abstract/scopus_id/85101435336 |
work_keys_str_mv |
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