摘要
氧化钨(WO_(3))薄膜作为阴极电致变色材料,还原态(阳离子嵌入)时着色而氧化态(阳离子脱出)时褪色;而普鲁士蓝(Prussian blue,PB)薄膜作为阳极电致变色材料,还原态(阳离子嵌入)时褪色而氧化态(阳离子脱出)时着色。利用不同离子存储状态下WO_(3)和PB薄膜的变色互补性,构筑了基于WO_(3)和PB薄膜的可变色超级电容器。利用脉冲激光沉积法和电沉积法在透明导电玻璃表面制备了WO_(3)/PB复合薄膜,并以该复合薄膜为电极,构筑了对称型可变色超级电容器。结果表明,WO_(3)/PB复合薄膜具有优异的循环稳定性,循环200圈后,面电容量的保持率可达83.8%;在650 nm时,由于WO_(3)和PB薄膜在不同电压下的协同变色,超级电容器的光透过率差在完全着色与褪色时为53.2%。该超级电容器在不同充、放电状态下可清晰地显示不同的颜色组合及光对比度,从而实现利用颜色变化指示超级电容器的能量存储状态。本研究有助于推动电致变色和能量存储领域的交叉融合,为超级电容器能量存储状态的可视化提供实验依据。
The WO_(3)is a typical cathodic electrochromic material,which colors in the reduction(cation intercalation)state and fades in the oxidation(cation deintercalation)state.However,Prussian blue(PB)is a typical anodic electrochromic material,which colors in the oxidation(cation de-intercalation)state and fades in the reduction(cation intercalation)state.The electrochromic-supercapacitor was constructed based on the WO_(3)and PB films due to the matched color changes for WO_(3)and PB films under different ion-storage states.The WO_(3)and PB composite films were prepared on the surface of transparent conductive glasses using the pulsed laser deposition and electro-deposition methods.The symmetric electrochromicsupercapacitor was fabricated using WO_(3)and PB composite films as electrodes.The results showed that the WO_(3)/PB composite film presents superior cycling stability with the areal capacitance retention of 83.8%after 200 cycles.In addition,the supercapacitor presents an optical contrast of 53.2%between the total coloring and bleaching states at 650 nm,which is ascribed to the synergetic color changes for WO_(3)and PB films under different voltages.Such supercapacitor exhibits different color changes under different charge-discharge states;thus,realizing the indication of energy-storage states through color changes.Our work pushes the combination of electrochromism and energy storage,leading to the visualization of energystorage states for supercapacitors.
作者
毕志杰
赵宁
郭向欣
BI Zhijie;ZHAO Ning;GUO Xiangxin(College of Physics,Qingdao University,Qingdao 266071,Shandong,China)
出处
《储能科学与技术》
CAS
CSCD
北大核心
2021年第3期952-957,共6页
Energy Storage Science and Technology
基金
国家自然科学基金项目(22005163,U1932205,51771222,52002197)
山东省“泰山学者”基金,山东省固态电池工程实验室。
关键词
电致变色
超级电容器
氧化钨
普鲁士蓝
双功能
electrochromic
supercapacitor
tungsten oxide
Prussian blue
bi-functional
