WO_(3)薄膜的电致变色性能对Al_(2)(SO_(4))_(3)水溶液的浓度依赖性及其机制  

Concentration dependence and mechanism of electrochromic properties of WO_(3) thinfilms on Al_(2)(SO_(4))_(3) aqueous solution

作　　者：钱小海 李原野 刘春雨[1] 吴建洋 俞圣雯[1] QIAN Xiaohai;LI Yuanye;LIU Chunyu;WU Jianyang;YU Shengwen(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《上海大学学报(自然科学版)》2025年第1期68-79,共12页Journal of Shanghai University:Natural Science Edition

摘　　要：将Al_(2)(SO_(4))_(3)水溶液作为电解质,研究了磁控溅射制备的WO_(3)薄膜的电致变色性能.Al_(2)(SO_(4))_(3)水溶液的浓度范围为0.025∼0.005 mol/L.研究发现:随着浓度的降低,光调制略有增加,响应时间延长,着色效率(coloration efficiency,CE)略有降低;降低Al^(3+)浓度可显著提高循环寿命;在0.005 mol/L浓度下电荷密度保留度R(Q)和光学调制保留度R(∆T)是0.025 mol/L浓度下的3倍以上;在0.005 mol/L Al_(2)(SO_(4))_(3)水溶液中,WO_(3)薄膜的电致变色性能最佳,光学调制率为76.3%,CE为80.14 cm^(2)/C,着色响应时间/褪色响应时间为10.6 s/13.6 s,具有长期循环稳定性(200次循环后的光学调制保留度为102.7%).电化学阻抗谱(electrochemical impedance spectroscopy,EIS)分析结果表明,当电荷转移速率高于离子传质速率时,有利于WO_(3)薄膜电致变色循环的稳定.The electrochromic performance of sputter-prepared WO_(3) thinfilms with an Al_(2)(SO_(4))_(3) aqueous electrolyte was investigated.The concentration of Al_(2)(SO_(4))_(3) aqueous solution was varied from 0.025 to 0.005 mol/L.As the concentration decreased,the op-tical modulation increased slightly,the response time was prolonged,and the coloration efficiency(CE)decreased slightly.However,the cycle life was significantly increased by reducing the Al^(3+)concentration.The retentions of the charge density and optical modu-lation at a concentration of 0.005 mol/L were over three times those at 0.025 mol/L.The optimal electrochromic performance of the WO_(3) thinfilms was observed in a 0.005 mol/L Al_(2)(SO_(4))_(3) aqueous solution,with high optical modulation of 76.3%and CE of 80.14 cm^(2)/C;reasonable response time of 10.6 and 13.6 s for coloring and bleaching,respectively;and long-term stability(102.7%retention of optical modulation after 200 cycles).Electrochemical impedance spectroscopy(EIS)suggested that the charge-transfer rate exceeding the ion mass transfer rate was conducive to the stability of the electrochromic cycle of the WO_(3) thinfilms.

关 键 词：电致变色 Al^(3+)基电解质 WO_(3) 薄膜 

分 类 号：TB321[一般工业技术—材料科学与工程]