多孔NiMn-LDH纳米片薄膜的溶剂热生长及其电致变色性能  

Porous NiMn-LDH Nanosheets Film:Solvothermal Growth and Electrochromic Properties

作　　者：冯星哲 马董云 王金敏 FENG Xingzhe;MA Dongyun;WANG Jinmin(School of Materials and Chemistry,University of Shanghai for Science and Technology,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》2024年第12期1391-1396,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(62275154)。

摘　　要：具有动态变色和调光特性的电致变色材料在汽车防眩后视镜、智能窗、低功耗显示、电子纸等领域具有潜在的应用价值,引起了人们的极大兴趣。NiO和MnO_(2)是为数不多的具有中性色调的阳极着色材料。然而,单一的NiO和MnO_(2)薄膜褪色态透过率较低,导致其光调制幅度较小。本研究以NiCl_(2)·6H_(2)O作为镍源、MnSO_(4)·H_(2)O作为锰源,采用溶剂热法直接在氟掺杂氧化锡(FTO)导电玻璃基底上生长多孔镍锰层状双氢氧化物(NiMn-LDH)电致变色薄膜。通过X射线衍射仪(XRD)和场发射扫描电子显微镜(FESEM)表征所制备的NiMn-LDH薄膜的晶相和微观形貌,并用紫外-可见-近红外分光光度计和电化学工作站研究其电致变色和电化学性能。结果表明:溶剂热法生长的薄膜是由NiMn-LDH纳米片组成,表面呈多孔结构,在550 nm处具有61.9%的光调制幅度,着色时间和褪色时间分别为15.8和13.2 s,着色效率为63.1 cm^(2)·C^(–1),在160次着色和褪色循环后的光调制幅度仍可以保持初始值的87.0%。此外,NiMn-LDH薄膜在0.1mA·cm^(–2)电流密度下的面电容为10.0mF·cm^(–2)。本研究制备的NiMn-LDH薄膜电极在电致变色和储能领域具有良好的应用前景。Electrochromic materials with dynamic color change and optical modulation have potential applications in the fields of automotive anti-glare mirror,smart window,low-power display,and electronic paper,attracting worldwide attention.NiO and MnO_(2) are typical anodic coloration materials with a comfortable neutral tone.However,the low transmittance of single NiO or MnO_(2) films in bleaching states leads to small optical modulation.Herein,a porous nickel-manganese layered double hydroxide(NiMn-LDH)film with neutral color for visible electrochromic application was prepared.The NiMn-LDH films were grown directly on fluorine-doped tin oxide(FTO)conductive glass substrates by a one-step solvothermal method using NiCl_(2)·6H_(2)O and MnSO_(4)·H_(2)O as the raw materials.The crystalline phase and micromorphology of the as-grown NiMn-LDH films were characterized and the electrochromic and electrochemical performances were also investigated.The results indicate that the film grown by solvothermal method is composed of NiMn-LDH nanosheets with porous surface morphology,leading to a large optical modulation of 61.9%at 550 nm.The coloration and bleaching time are calculated to be 15.8 and 13.2 s,respectively.A high coloration efficiency of 63.1 cm^(2)·C^(–1)is also achieved for the as-grown NiMn-LDH nanosheet film.Meanwhile,the NiMn-LDH film electrode demonstrates good cycle stability,retaining 87.0%of its maximum optical modulation after 160 cycles.Furthermore,the NiMn-LDH film electrode delivers an area capacitance of 10.0 mF·cm^(–2)at a current density of 0.1 mA·cm^(–2).These results consolidate that the as-prepared NiMn-LDH film electrode is a promising candidate for both electrochromic and energy-storage applications.

关 键 词：NiMn-LDH 电致变色 纳米片 溶剂热 

分 类 号：TQ174[化学工程—陶瓷工业]