Description Detail

Vol.27, No.1(2020-2)(32-37) 
Study on [email protected]/Graphene Aerogel for Supercapacitors
鈷錳-金屬有機架構@二氧化釩/石墨烯氣凝膠應用於超級電容器之研究
Chian-Yu Yeh、Hsieh-Chih Chen
葉千瑜、陳協志
Supercapacitors with a higher power density than batteries, a higher energy density than capacitors, and a longer cyclic life are promising energy-storage devices. Metal organic frameworks (MOFs) have large specific areas and are potential candidates for the electrode of supercapacitors. This study adopts the hydrothermal method to prepare [email protected]/graphene aerogel as the supercapacitor’s electrode. Electrochemical properties of the electrode, hydrothermal temperature, and sulfurization effect were investigated. SEM micrograms show that CoMn-MOF crystals have a grain size of 3~7 m and cross-sectional surface of aerogel have a laminate structure and many pores. The increase of hydrothermal temperature from 120 oC to 160 oC decreases the highest specific capacitance from 510.9 F/g to 168.4 F/g, because of non-uniform distribution of large CoMn-MOF crystals causing a higher resistance. Electrodes with sulfurization exhibit an increase in capacitance to 792.5 F/g, due to a higher electric conductivity. Moreover, the sulfurized electrode experiences a smaller decrease in capacitance with increasing current density.
超級電容器(supercapacitors)具有高於電池的功率密度、高於傳統電容器的能量密度以及良好的充放電循環壽命等優點,是目前具潛力的儲能元件。金屬有機框架(metal organic frameworks, MOFs)材料具有高比表面積,可作為電化學儲能元件的電極。本研究使用二氧化釩/石墨烯氣凝膠當作基材,利用水熱法製備鈷錳-金屬有機架構@二氧化釩/石墨烯氣凝膠([email protected]/graphene aerogel)作為超級電容器之電極,量測其電化學性質,並探討MOF水熱溫度與電極硫化的效應。從SEM微結構分析,可看出CoMn-MOF結晶的顆粒大小約為3~7 m,氣凝膠的切面具有層狀結構及明顯的孔洞。當水熱溫度從120 oC上升至160 oC,會導致CoMn-MOF的顆粒較大且在氣凝膠中分布不均勻,造成電極阻抗增加,比電容值下降,量測得到的電極最大比電容值分別為510.9 F/g與168.4 F/g。硫化後的電極導電性較佳,阻抗較小,進而使電極的比電容值增加,其最大比電容值可提高至792.5 F/g,而且硫化後電極的比電容值隨電流密度增加而下降的幅度較小,代表電極在硫化後趨於穩定。
Supercapacitors; Metal organic frameworks; Graphene aerogel; Sulfurized electrode; Capacitance
超級電容器、金屬有機框架、石墨烯氣凝膠、電極硫化、電容值
Year Volume
2020 27.1 | 27.2
27.3 |
2019 26.1 |
2018 25.1 |
2017 24.1 | 24.2
24.3 | 24.4
24.5 | 24.6
24.7 | 24.8
24.9 |
2016 23.1 | 23.2
23.3 | 23.4
23.5 | 23.6
23.7 | 23.8
2015 22.1 | 22.2
22.3 | 22.4
22.5 |
2014 21.1 | 21.2
21.3 |
2013 20.1 | 20.2
20.3 | 20.4
2012 19.1 | 19.2
19.3 | 19.4
2011 18.1 | 18.2
2010 17.4