<abstract xmlns="http://www.w3.org/1999/xhtml">Reduced graphene oxide/bismuth oxide (rGO/Bi2O3) composites were prepared at various weight ratios of raw materials, GO and bismuth nitrate at 1:0.1, 1:0.3, 1:0.6, 1:0.9 and 1:1.2, respectively, by the improved Hummer’s method. During the process, the mixed solutions were prepared, and then rGO was obtained by hydrothermal method. Finally, the complex of rGO/Bi2O3 was prepared by calcination after hydrothermal treatment. The results show that the removal of oxygen-containing functional groups in rGO are increased with the increase of graphene agglomeration, and the Raman shifts of G band tending to the lowest wave-number. The electrochemical characteristics of the as-prepared rGO/Bi2O3 materials were also examined in 1 M KOH electrolyte. The dominating charge storage mechanisms are attributed to the electric double layer behaviors. As the content of bismuth nitrate increased, the rGO/Bi2O3 had a higher capacitance. The rGO/Bi2O3 obtained from the weight ratio of GO and bismuth nitrate of 1:1.2 as raw materials exhibit a maximum specific capacitance of 216 Fg−1, revealing that rGO/Bi2O3 obtained by hydrothermal synthesis method can be used for the carbon-electrode of a super capacitor.</abstract>

Reduced graphene oxide/bismuth oxide (rGO/Bi2O3) composites were prepared at various weight ratios of raw materials, GO and bismuth nitrate at 1:0.1, 1:0.3, 1:0.6, 1:0.9 and 1:1.2, respectively, by the improved Hummer’s method. During the process, the mixed solutions were prepared, and then rGO was obtained by hydrothermal method. Finally, the complex of rGO/Bi2O3 was prepared by calcination after hydrothermal treatment. The results show that the removal of oxygen-containing functional groups in rGO are increased with the increase of graphene agglomeration, and the Raman shifts of G band tending to the lowest wave-number. The electrochemical characteristics of the as-prepared rGO/Bi2O3 materials were also examined in 1 M KOH electrolyte. The dominating charge storage mechanisms are attributed to the electric double layer behaviors. As the content of bismuth nitrate increased, the rGO/Bi2O3 had a higher capacitance. The rGO/Bi2O3 obtained from the weight ratio of GO and bismuth nitrate of 1:1.2 as raw materials exhibit a maximum specific capacitance of 216 Fg−1, revealing that rGO/Bi2O3 obtained by hydrothermal synthesis method can be used for the carbon-electrode of a super capacitor.

Preparation of rGO/Bi2O3 composites by hydrothermal synthesis for supercapacitor electrode

Department of Chemical and Materials Engineering

National Kaohsiung University of Science and Technology

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Preparation of rGO/BiO composites by hydrothermal synthesis for supercapacitor electrode

Reduced graphene oxide/bismuth oxide (rGO/Bi2O3) composites were prepared at various weight ratios of raw materials, GO and bismuth nitrate at 1:0.1, 1:0.3,...

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode

Published Online: Sep 28, 2019

Page range: 101 - 106

Received: Mar 19, 2019

DOI: https://doi.org/10.2478/jee-2019-0049

Keywords
reduced graphene oxide, bismuth oxide, hydrothermal, capacitance

© 2019 Wein-Duo Yang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Preparation of rGO/Bi2O3 composites by hydrothermal synthesis for supercapacitor electrode

Published Online: Sep 28, 2019

Page range: 101 - 106

Received: Mar 19, 2019

DOI: https://doi.org/10.2478/jee-2019-0049

Keywordsreduced graphene oxide, bismuth oxide, hydrothermal, capacitance

© 2019 Wein-Duo Yang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Preparation of rGO/Bi₂O₃ composites by hydrothermal synthesis for supercapacitor electrode

Keywords
reduced graphene oxide, bismuth oxide, hydrothermal, capacitance