Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Montmorillonite as the multifunctional reagent for preparing reduced graphene oxide and its improved supercapacitive performance
https://orcid.org/0000-0001-5558-0741
https://orcid.org/0000-0003-3831-3144
Abstract Reduced graphene oxide (rGO) was prepared using oxalic acid in th e presence of montmorillonite (Mt) via hydrothermal treatment. The structure characterizations indicated that the porous structure of the obtained rGO and the residual oxygen groups were dominated by carbonyl and carboxyl groups. The mechanism analysis showed that the introduction of Mt. ensured the formation of isolated graphene oxide nanosheets free from being reduced by oxalic acid, further alleviating the irreversible restacking of rGO sheets. Electrochemical measurements demonstrated that the resultant rGO electrode offered a high specific capacitance (C s) of 315 F/g at 1 A/g in a three-electrode configuration and the symmetric supercapacitor based on this electrode exhibited superior cycle stability with 89.7% capacitance retention after 10,000 cycles. This present work proposes a novel strategy for controlling the effects of oxalic acid on GO via employing multi-role Mt., also expands the preparation scope of graphene-based electrode materials.
Graphical abstract Display Omitted
Highlights Oxalic acid can effectively reduce graphene oxide and make pores on its surface. Mt. performs a multifunctional effect on regulating the microstructure of graphene. The carbonyl-rich graphene has appropriate pore diameter. Obtained samples show superior specific capacitance retention and cyclic stability.
Montmorillonite as the multifunctional reagent for preparing reduced graphene oxide and its improved supercapacitive performance
https://orcid.org/0000-0001-5558-0741
https://orcid.org/0000-0003-3831-3144
Abstract Reduced graphene oxide (rGO) was prepared using oxalic acid in th e presence of montmorillonite (Mt) via hydrothermal treatment. The structure characterizations indicated that the porous structure of the obtained rGO and the residual oxygen groups were dominated by carbonyl and carboxyl groups. The mechanism analysis showed that the introduction of Mt. ensured the formation of isolated graphene oxide nanosheets free from being reduced by oxalic acid, further alleviating the irreversible restacking of rGO sheets. Electrochemical measurements demonstrated that the resultant rGO electrode offered a high specific capacitance (C s) of 315 F/g at 1 A/g in a three-electrode configuration and the symmetric supercapacitor based on this electrode exhibited superior cycle stability with 89.7% capacitance retention after 10,000 cycles. This present work proposes a novel strategy for controlling the effects of oxalic acid on GO via employing multi-role Mt., also expands the preparation scope of graphene-based electrode materials.
Graphical abstract Display Omitted
Highlights Oxalic acid can effectively reduce graphene oxide and make pores on its surface. Mt. performs a multifunctional effect on regulating the microstructure of graphene. The carbonyl-rich graphene has appropriate pore diameter. Obtained samples show superior specific capacitance retention and cyclic stability.
Montmorillonite as the multifunctional reagent for preparing reduced graphene oxide and its improved supercapacitive performance
https://orcid.org/0000-0001-5558-0741
https://orcid.org/0000-0003-3831-3144
Abstract Reduced graphene oxide (rGO) was prepared using oxalic acid in th e presence of montmorillonite (Mt) via hydrothermal treatment. The structure characterizations indicated that the porous structure of the obtained rGO and the residual oxygen groups were dominated by carbonyl and carboxyl groups. The mechanism analysis showed that the introduction of Mt. ensured the formation of isolated graphene oxide nanosheets free from being reduced by oxalic acid, further alleviating the irreversible restacking of rGO sheets. Electrochemical measurements demonstrated that the resultant rGO electrode offered a high specific capacitance (C s) of 315 F/g at 1 A/g in a three-electrode configuration and the symmetric supercapacitor based on this electrode exhibited superior cycle stability with 89.7% capacitance retention after 10,000 cycles. This present work proposes a novel strategy for controlling the effects of oxalic acid on GO via employing multi-role Mt., also expands the preparation scope of graphene-based electrode materials.
Graphical abstract Display Omitted
Highlights Oxalic acid can effectively reduce graphene oxide and make pores on its surface. Mt. performs a multifunctional effect on regulating the microstructure of graphene. The carbonyl-rich graphene has appropriate pore diameter. Obtained samples show superior specific capacitance retention and cyclic stability.
Montmorillonite as the multifunctional reagent for preparing reduced graphene oxide and its improved supercapacitive performance
Zhang, Shanshan (Autor:in) / Yang, Yang (Autor:in) / Xiao, Rubo (Autor:in) / Yu, Mengying (Autor:in) / Zhang, Yong (Autor:in) / Sun, Xiangcheng (Autor:in) / Lu, Luhua (Autor:in) / Wu, Xiuling (Autor:in) / Chen, Ying (Autor:in)
Applied Clay Science ; 200
25.08.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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