Silver Nanoparticle-Loaded Graphene Aerogels for Supercapacitors
| Autor: | HUNG, HAO-CHUNG, 洪晧淳 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Supercapacitors have high power density and rapid charging-discharging operation. However, there's still need for improving their energy storage efficiencies. Graphene aerogels have porous structures and higher surface areas to enhance electric double layer capacitance. Metals exhibit electrochemical redox reaction ability to promote energy storage efficiencies. The study prepares graphene aerogels and nitrogen-doped graphene aerogels by using chemical reduction method(CR) and hydrothermal method(HT). Then, silver(Ag) particles were loaded on the carbon materials by photodeposition. They were applied at supercapacitor electrode materials and characterized for pore properties and silver dispersion. For silver loaded on graphene aerogels prepared by the chemical reduction method, the Ag/GA-CR has a higher capacitance than the Ag/NGA-CR, because the former has a good dispersibility. For silver loaded on graphene aerogels prepared by the hydrothermal method. The Ag/NGA-HT has a higher capacitance than the Ag/GA-HT, because the former has a high surface areas. Cyclic voltammetry and charging-discharging analyses show a pseudo-capacitor characteristic of silver. Electrochemical impedance analysis shows that silver can improve electron transfer, reduce equivalent series resistance and increase ion diffusion rate. Therefore, the silver deposition is effective to promote energy storage. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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