(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Ti/(Ir0.3Sn(0.7-x)Cex)O2三元氧化物電極材料(0＜x＜0.5)。采用X射線衍射(XRD)、交流阻抗和循環(huán)伏安法分析成分對(duì)Ti/(Ir0.3Sn(0.7-x)Cex)O2電極材料的晶體結(jié)構(gòu)和電化學(xué)性能的影響。結(jié)果表明：適量的Ce可降低氧化物涂層中金紅石相的晶化程度，優(yōu)化氧化物涂層的結(jié)構(gòu)，并提高Ti/(Ir0.3Sn(0.7-x)Cex)O2電極材料的電容性能。當(dāng)x=0.2時(shí)，Ti/(Ir0.3Sn0.5Ce0.2)O2電極的比電容達(dá)到414 F/g，約為Ti/IrO2-SnO2二元氧化物電極的3倍；該電容材料表現(xiàn)出很高的比能量特性，在4.97 kW/kg的高功率密度放電時(shí)，對(duì)應(yīng)的能量密度達(dá)到82.88 W·h/kg。當(dāng) x≥0.3時(shí)，隨著Ce含量增大，氧化物涂層的導(dǎo)電性能和頻率響應(yīng)特性會(huì)遭到惡化，對(duì)電極的電容性能不利。因此，Ce的含量控制在0.2(摩爾分?jǐn)?shù))以內(nèi)為宜。
關(guān)鍵字: 超級(jí)電容器; 交流阻抗; 二氧化銥; 二氧化鈰
（1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;
2. College of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China）
Abstract:(Ir0.3Sn(0.7-x)Cex)O2 ternary oxide electrode materials (0＜x＜0.5) were obtained by thermal decomposition method on Ti substrate at a moderate temperature of 360℃. The influence of the compositions on microstructure and capacitive performance of the Ti/(Ir0.3Sn(0.7-x)Cex)O2 electrodes was investigated by XRD, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry(CV). The results show that a certain amount of Ce can reduce the degree of crystallization of rutile phase oxide in coating, optimize the microstructure of the oxide coating, and therefore improve the capacitive properties of the electrode material. When x is 0.2, the ternary oxides electrode reaches its maximum specific capacitance of 414 F/g, which is about three times of that of the Ti/IrO2-SnO2 electrode. The electrode shows a high specific energy density, when the power density is 4.97 kW/kg, the corresponding energy density reaches 82.88 W？h/kg. When x is more than 0.3, the electronic/protonic conductivity, frequency response characteristics as well as capacitive property of the Ti/(Ir0.3Sn(0.7-x)Cex)O2 electrodes are seriously deteriorated with increasing the Ce content. Therefore, the Ce content should be controlled in less than 0.2 (mole fraction).
Key words: supercapacitor; electrochemical impedance spectroscopy; IrO2; CeO2
