Electrochemical Properties of Biobased Carbon Aerogels Decorated with Graphene Dots Synthesized from Biochar

Carbon aerogels prepared from low-cost renewable resources are promising electrode materials for future energy storage applications. However, their electrochemical properties must be significantly improved to match the commercially used high-carbon petroleum products. This paper presents a facile method for the green synthesis of carbon aerogels (CAs) from lignocellulosic materials and graphene dots (GDs) from commercially available biochar. The produced carbon aerogels exhibited a hierarchical porous structure, which facilitates energy storage by forming an electrical double-layer capacitance. Surprisingly, the electrochemical analyses of the GD-doped carbon aerogels revealed that in comparison to pristine carbon aerogels, the surface doping of GDs enhanced the electrochemical performance of carbon aerogels, which can be attributed to the combined effect from both double-layer capacitance and pseudocapacitance. Herein, we designed and demonstrated the efficacy of a supercapacitor device using our green carbon electrode as a sustainable option. These green carbon aerogels have opened a window for their practical use in designing sustainable energy storage devices. Validerad;2021;Nivå 2;2021-11-30 (johcin)</p

Development and characterizations of Ag nanoparticles decorated TiO2-ZrO2 coatings as electrode material for supercapacitors

Supercapacitors are considered as newly developed auxiliary and clean supplies of power and energy for the next generation energy storage devices with significant impact in many fields. In the present investigation, Ag nanoparticles decorated over TiO2-ZrO2 films are used as the material for energy storage applications. The cyclic voltammograms of the proposed material show better specific capacitance values and robust cyclic stability. The results of the electrochemical measurements further show a strong double-layer electrical capacitance of ternary mixed oxides. The synergetic interaction among the components in the hierarchical nanostructured porous Ag@TiO 2-ZrO2 film guaranteed the good capacitive performance. The comparison between the TiO2-ZrO2 films and Ag decorated TiO 2-ZrO2 films bring out the strong interconnection between the constitution and composition of both systems and their properties. These results underline the exceptional electrical double layer capacitive behavior that is seen in porous ternary composite films with better surface area. Furthermore, such a simple and low-cost layer by layer assembly method with self-cleaning property can be used for the large-scale fabrication of diverse functional architectures for energy storage and conversions