锶离子掺杂对NiO薄膜离子传输和电致变色性能的改善作用

Effect of Sr Ion Doping on Ion Transport and Electrochromic Properties of NiO Films

电致变色材料在智能显示和军事伪装等领域具有非常重要的应用前景。为了改善NiO薄膜在碱性电解液中变色响应时间长和循环稳定性差的问题,采用水热法制备了锶离子掺杂纳米片状NiO电致变色薄膜,离子掺杂引起的晶格畸变与微纳结构的协同作用,使NiO薄膜展现出了优异的电致变色性能。锶离子掺杂一方面改善了NiO薄膜的电化学特性,从而缩短了电致变色响应时间(着色时间约为4.5 s,褪色时间约为2.7 s),提高了着色效率(CE,85.2 cm^(2)·C^(-1))。另一方面为NiO晶体结构提供了支撑,增强了电致变色过程中晶体结构的稳定性,从而显著提升了薄膜的循环稳定性(循环次数超过了10000次)。本研究结果对促进电致变色材料的工程化应用具有一定的借鉴和指导意义。

Electrochromic materials have very important application prospects in the fields of intelligent display and military camouflage.In order to improve the long response time and poor cycling stability of NiO film in alkaline electrolyte,strontium doped nano-sheet NiO electrochromic films were prepared by hydrothermal method.The lattice distortion caused by ion doping and the synergy of micro-nano structure make NiO thin films exhibit excellent electrochromic properties.Strontium ion doping improves the electrochemical characteristics of NiO film,thus improving the electrochromic response time(coloring time is about 4.5 s,bleaching time is about 2.7 s)and the coloration efficiency(CE,85.2 cm^(2)·C^(-1)).On the other hand,it provides support for the NiO crystal structure,strengthens the stability of the crystal structure in the electrochromic process,and significantly improves the cycle stability of the film(the cycle number exceeds 10000).The research results have certain reference and guiding significance to promote the engineering application of electrochromic materials.