(1. 福州大學(xué) 材料科學(xué)與工程學(xué)院，福州 350108；
2. 廈門理工學(xué)院 材料科學(xué)與工程學(xué)院，廈門 361024)
摘 要: 采用熱分解法在360 ℃制備了Ti/IrO2-SnO2-xCeO2(摩爾分?jǐn)?shù))電極，通過(guò) X射線衍射(XRD)、交流阻抗(EIS)和循環(huán)穩(wěn)定實(shí)驗(yàn)分析CeO2含量對(duì) Ti/IrO2-SnO2-xCeO2涂層組織、電容性能、頻率響應(yīng)特性和循環(huán)穩(wěn)定性的影響。結(jié)果表明：CeO2可抑制IrO2-SnO2晶化，隨CeO2含量的增加，IrO2-SnO2的晶化程度逐漸下降。含20% CeO2電極比電容可達(dá)505.7 F/g，是同頻率下Ti/IrO2-SnO2電極的3倍。CeO2含量不超過(guò)20%時(shí)，對(duì)電極的傳荷電阻Rct及弛豫時(shí)間常數(shù)τ影響較小。經(jīng)歷6000次循環(huán)后，10% CeO2電極電容增加了34.39%，20% CeO2電極電容增加了3.45%，顯示電極優(yōu)良的抗電容衰減能力。
關(guān)鍵字: 超級(jí)電容器；電化學(xué)交流阻抗；頻率特性；二氧化銥；二氧化鈰
（1. College of Materials Science and Engineering, Fuzhou University，F(xiàn)uzhou 350108, China;
2. College of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China）
Abstract:Ti/IrO2-SnO2-xCeO2 (mole fraction) electrodes with different mole fractions of CeO2 were obtained by thermal decomposition method at 360 ℃. The influences of the CeO2 content on microstructure and EIS properties of the prepared electrodes were investigated by XRD, EIS and stability test. The results show that the crystallization degree of the IrO2-SnO2 oxides decreases with increasing CeO2 content, which reveal that CeO2 can inhibit crystallization of IrO2-SnO2. The electrode with 20% CeO2 reaches maximum specific capacitance of 505.7 F/g, which is about three times than that of the IrO2-SnO2 binary oxides electrode. When the amount of CeO2 is less than 20%, the less effect on the transfer resistance (Rct) and relaxation time (τ) can be obtained. After 6000 times cycle, the specific capacitance of the electrode with 10%CeO2 increases by 34.39% and 20% CeO2 increases by 3.45%. The electrodes have good cyclic stability.
Key words: supercapacitor; electrochemical impedance spectroscopy; frequency-response characteristic; IrO2; CeO2
