Porous NiMn-LDH Nanosheets Film:Solvothermal Growth and Electrochromic Properties
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 MnO2 are typical anodic coloration materials with a comfortable neutral tone.However,the low transmittance of single NiO or MnO2 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 NiCl2·6H2O and MnSO4·H2O 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 cm2·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.
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