CAJ | 학술논문

以聚四氟乙烯(PTFE)为黏结剂制备了不同组分的石墨粉(GP)和多壁碳纳米管(MWCNT)复合电极,采用恒电位阶跃、循环伏安、电化学阻抗谱及恒电流充放电等方法系统考察了 GP-MWCNT 复合电极在全钒液流电池(VRFB)体系中的电化学性能.实验结果表明:复合电极中MWCNT含量的增加有利于VRFB正、负极反应的进行,纯MWCNT电极表现出最优的电化学性能;以纯MWCNT电极为正、负极构建的VRFB电池在30 mA/cm2的恒电流充放电条件下表现出了良好的稳定性和电化学性能,电流效率、电压效率和能量效率分别为96%、87%和84%.
이취사불을희(PTFE)위점결제제비료불동조분적석묵분(GP)화다벽탄납미관(MWCNT)복합전겁,채용항전위계약、순배복안、전화학조항보급항전류충방전등방법계통고찰료 GP-MWCNT 복합전겁재전범액류전지(VRFB)체계중적전화학성능.실험결과표명:복합전겁중MWCNT함량적증가유리우VRFB정、부겁반응적진행,순MWCNT전겁표현출최우적전화학성능;이순MWCNT전겁위정、부겁구건적VRFB전지재30 mA/cm2적항전류충방전조건하표현출료량호적은정성화전화학성능,전류효솔、전압효솔화능량효솔분별위96%、87%화84%.
Graphite (GP) based composite electrodes containing multi-walled carbon nanotube (MWCNT) were prepared for vanadium redox flow batteries (VRFB) using polytetrafluoroethylene (PTFE) as binding agent. Electrochemical performance of the GP-MWCNT composite electrodes was characterized by chronoamperometry, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that both positive and negative electrode reactions of VRFB benefited from the use of more MWCNT in the composite electrode, and the best electrochemical performance was obtained with pure MWCNT electrode. A VRFB was therefore constructed using pure MWCNT electrodes as both the positive and negative electrodes. Preliminary charge/discharge tests at a current density of 30 mA/cm2 demonstrated that the VRFB had a good stability and electrochemical performance. The current efficiency, voltage efficiency and energy efficiency were 96%, 87%and 84%, respectively.