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Zhang, Jiamin, et al. Journal of Physics and Chemistry of Solids 153 (2021): 110019.
In this study, tetramethylammonium bicarbonate (TMAB) was utilized as a novel precipitant in the synthesis of amorphous ruthenium oxide/hemp stem activated carbon (HSAC) composites via a liquid phase co-precipitation method. This represents the first reported application of TMAB in this context, enabling the formation of small, homogeneously distributed ruthenium oxide nanoparticles on the activated carbon surface.
The synthesis involved dissolving RuCl3·xH2O in a mixed water-ethanol solution, followed by the gradual addition of HSAC under controlled stirring and temperature. Aqueous TMAB solution was then introduced dropwise until neutral pH was achieved, facilitating controlled precipitation of ruthenium oxide onto the carbon substrate. The resulting composites were further processed by hydrothermal treatment at 180 °C in either water (RH-1) or ethanol (RH-2).
Electrochemical evaluation demonstrated that the TMAB-mediated composites exhibit outstanding performance as supercapacitor electrodes. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) analyses revealed a high mass-specific capacitance of 652.79 F g⁻¹ at 5 mV s⁻¹ and excellent rate capability. Electrochemical impedance spectroscopy (EIS) confirmed low device series resistance (0.653 Ω), indicating efficient charge transport. The composites also displayed remarkable cycling stability, highlighting the robustness of the TMAB-directed material structure.
This work establishes tetramethylammonium bicarbonate as an effective and environmentally benign precipitating agent for the preparation of high-performance metal oxide/carbon composites, providing a facile strategy for the design of advanced energy storage and conversion materials.
