利用氧化鋅奈米粒子及木質活性碳製備複合式碳電極應用於超級電容器之研究

Application of composite carbon electrode with ZnO nanoparticles and wood activated carbon on supercapacitor

王啟翔(Chi-Hsiang Wang)

指導教授 ： 閔庭輝

國立虎尾科技大學/電機資訊學院/電子工程系碩士班/碩士(2016年)

摘要

本研究以木質活性碳(wood activated carbon)製備超級電容器之碳電極，探討導電碳黑之重量比對電容特性之影響。利用濾紙過濾，以烘烤方法製作出具有碳黑披覆木質活性碳之結構碳粉，並製作出超級電容器複合式電極，找出最佳電容特性之複合式碳電極製備參數。另外，為了提高木質活性碳之表面積，從而摻雜氧化鋅奈米粒子，探討不同重量比對電容特性之影響。以循環伏安(CV)和恆電流充放電測試(Charge-discharge test)探討超級電容器之電極影響；利用場發射掃描式電子顯微鏡(FE-SEM)觀察碳電極表面之微結構；使用物理吸附分析儀(Micromeritics Instrument Corporation, ASAP 2020)量測碳材之比表面積、孔徑分析；X-射線繞射分析(XRD)鑑定薄膜樣品相位。

研究結果顯示，添加30wt.%的碳黑可製備出最佳電容特性之複合式碳電極，其比電容值於水系電解質(1M KOH)中為182.7 F/g，並以1mA之恆電流充放電測試效率，其效率可達到72%。木質活性碳摻雜氧化鋅奈米粒子，有效提高電極之表面積，測得比電容值與恆電流充放電測試效率分別為227.16和72%。

關鍵字

超級電容器 ； 木質活性碳 ； 複合式碳材 ； 氧化鋅 ； 氧化鋅奈米粒子

並列摘要

In this study, the carbon electrode of supercapacitor was fabricated using wood activated carbon. The optimal processing parameters of carbon electrode for the best capacitative properties of supercapacitor are investigated. The composite carbon electrode of carbon black coated wood activated carbon structure was prepared by filtering and heat treatment. The best capacitative properties of super-capacitor doped zinc oxide nanoparticles. Investigated the different weight ratio of zinc oxide nanoparticles for carbon electrode on the characteristics of capacitance the influences. The influences of carbon electrode on the characteristics of capacitance are studied using cyclic voltammogram and charge-discharge test. Using Field emission scanning electronmicroscope (FE-SEM) observe the microstructure of the carbon electrode surface. Using BET measurements were carried out to determine their surface areas and pore-size.
Experimental results reveal that the optimum carbon electrode can be obtained using wood activated carbon with adding 30 wt.%. The specific capacitance of carbon electrodes in 1M KOH of 182.7 F/g can be obtained. In the charge-discharge test at current 1 mA, the charge-discharge efficiency of was about 72%. Finally, the best capacitative properties of supercapacitor doped zinc oxide nanoparticles can deliver a specific capacitance of 227.16 F/g and the charge-discharge efficiency of was about 72%.

並列關鍵字

Supercapacitor ； Wood activated carbon ； Composite carbon ； ZnO ； ZnO nanoparticles

參考文獻

[1] N. Jha, P. Ramesh, E. Bekyarova, M.E. Itkis and R. C. Haddon, 2012, “High energy density supercapacitor based on a hybrid carbon nanotube–reduced graphite oxide architecture”, Advanced Energy Materials., vol. 2, pp. 438-444.

[5] D. H.Fritts, 1997, “An Analysis of Electrochemical Capacitors”, J. Electrochem. Soc., vol. 144, issue 6, pp. 2233-2241.

[9] 范錦松，2014，“以碳黑披覆中間相微碳球製備碳電極於超級電容之研究”，國立中山大學電機工程所碩士論文 。

[12] B.E. Conway, 1991, “Transition from 'supercapacitor' to 'battery' behavior in electrochemical energy storage” , J. Electrochem. Soc., vol.138, pp.1539.

[16] H.E. Becker, 1957, “Low voltage electrolytic capacitor”, U.S. Patent, 2,800,616.