Graphene/Coblt oxide(Co3O4) composites of Electrocatalytic oxygen reduction

• Main Authors: Hong-Lin Chen, 陳虹霖
• Other Authors: Wen-Jauh Chen
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/he7qsm

碩士 === 國立雲林科技大學 === 材料科技研究所 === 105 === In this work Co3O4 nanoparticles on graphene (Co3O4/GN) was formed from graphite oxide (GO) by two-stage chemical reduction method. The graphite was first oxidized to graphene oxide (GO) by Hummers method, then reduced to graphene. The precursor cobalt acetate mixedwith ammonia water prepared for Co3O4 nanoparticles/graphene composite materials by hydrothermal reduction. In this study, Taguchi Method L9 ﹝34﹞ orthogonal arrays is used to list the control factors and levels, to assess the capacitance of the Co3O4/graphene composite materials, electrical properties, to find the best conditions in the different combinations of the conditions and the greatest impact factor. In the XRD, SEM and electrochemical workstation tests, it was confirmed that the pH was the most influential factor, followed by the hydrothermal temperature. When the pH and the hydrothermal temperature are low, the cobalt oxide particles are uniformly dispersed on the graphene, but the capacitance is very small. Improve the pH and hydrothermal temperature, the amount of cobalt oxide began to accumulate on the graphene, the capacitance of the larger results. The best combination factor is 1:3 pH10 180℃ 12H using cyclic voltammetry (CV), galvanostatic charge-discharge(GCD), cycle stability, the results show that the average capacitance of 75.59 F/g, after 50 cycles charge and discharge, the capacitor retention rate 72.82%.