多孔NiMoO_(4)纳米片薄膜的直接水热生长及其电致变色性能  

Directly Hydrothermal Growth and Electrochromic Properties of Porous NiMoO_(4) Nanosheet Films

作　　者：牛海滨 黄佳慧 李倩文 马董云 王金敏 NIU Haibin;HUANG Jiahui;LI Qianwen;MA Dongyun;WANG Jinmin(University of Shanghai for Science and Technology,School of Materials and Chemistry,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《无机材料学报》2023年第12期1427-1433,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(62275154)。

摘　　要：钼酸镍(NiMoO_(4))是一种在储能和催化领域具有优异性能的材料,但在电致变色领域还缺乏深入探索研究。本研究未使用晶种层,采用水热法在透明导电玻璃基底上生长了多孔NiMoO_(4)薄膜。采用掠入射X射线衍射仪(GIXRD)、场发射扫描电子显微镜(FESEM)对NiMoO_(4)纳米片薄膜样品的晶相和微观形貌进行了表征,并研究了NiMoO_(4)薄膜的电化学性能和电致变色性能。结果表明:NiMoO_(4)电致变色薄膜具有多孔结构,能够为离子迁移提供充足的通道和反应活性位点。因此,NiMoO_(4)薄膜表现出优异的电致变色性能,其光调制幅度达到79.6%,着色效率为86.2 cm^(2)·C^(-1),着色和褪色时间分别为9.5和12.7 s(在褪色过程存在一个快速和一个慢速步骤),经过100次着色和褪色循环后光调制幅度仍可以保持最大光调制幅度的99.7%。此外,该薄膜在0.3 mA·cm^(-2)的电流密度下的面积比电容高达49.59 mF·cm^(-2)。上述优异的性能使NiMoO_(4)纳米片薄膜有望在高性能电致变色器件中得到重要应用。在器件的组装过程中,探索合适的电解质以及与NiMoO_(4)薄膜相匹配的对电极将是下一步研究工作的重点。Nickel molybdate(NiMoO_(4))is a material with excellent performance in the field of energy storage and catalysis,but lacking of further explorations in the field of electrochromism.In this work,porous NiMoO_(4) films were grown on transparent conductive glasses by hydrothermal method without using seed layer.Crystalline phase and micromorphology of NiMoO_(4) nanosheet films were characterized by grazing incidence X-ray diffractometer(GIXRD)and field-emission scanning electron microscope(FESEM),and the electrochromic and electrochemical properties were also investigated by using a UV-Vis-NIR spectrophotometer and an electrochemical workstation.The results show that the NiMoO_(4) electrochromic films have a porous structure,which can provide sufficient channels for ion migration and reactive sites for the dynamic process of ion intercalation/deintercalation into NiMoO_(4) film.Therefore,the NiMoO_(4) films exhibit excellent electrochromic performance,including large optical modulation of 79.6%at 480 nm and high coloring efficiency of 86.2 cm^(2)·C^(-1).Meanwhile,the coloration and bleaching response time of the NiMoO_(4) films are 9.5 and 12.7 s,respectively.Interestingly,there is a two-step process in the bleached process of NiMoO_(4) electrochromic films,including a fast process and a slow process.And the optical modulation can still be maintained at 99.7%of the maximum optical modulation after 100 cycles.In addition,the NiMoO_(4) films exhibit a large area specific capacitance of 49.59 mF·cm^(-2) at 0.3 mA·cm^(-2).These excellent properties support NiMoO_(4) nanosheet films with promising application in high-performance electrochromic devices.And the next step is to focus on finding the suitable electrolyte and matched counter electrodes in the device assembly.

关 键 词：NiMoO_(4) 电致变色 纳米片 水热法 

分 类 号：TQ174[化学工程—陶瓷工业]