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

doi:10.15541/jim20240137

Abstract

Abstract:

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.

Key words: NiMn-LDH, electrochromic, nanosheet, solvothermal

CLC Number:

TQ174

FENG Xingzhe, MA Dongyun, WANG Jinmin. Porous NiMn-LDH Nanosheets Film: Solvothermal Growth and Electrochromic Properties[J]. Journal of Inorganic Materials, 2024, 39(12): 1391-1396.

Figures/Tables 6

Fig. 1 XRD pattern of the NiMn-LDH film

Fig. 2 FESEM images of as-grown NiMn-LDH film at (a) low- and (b) high-magnification

Fig. 3 Electrochemical properties of the NiMn-LDH film (a) CV curve scanned at 5 mV·s-1; (b) CV curves at different scanning rates; (c) GCD curves at different current densities; (d) Specific capacitance variations with respect to the current density

Fig. 4 Digital photos of the NiMn-LDH film (a) Bleached state; (b) Colored state

Fig. 5 Electrochromic properties of the NiMn-LDH film (a) Transmittance spectra in the colored and bleached states; (b) Time-current curve measured at -1.2 V for 25 s and 1.0 V for 25 s; (c) Real-time transmittance change; (d) Optical density variations with respect to the charge density at 550 nm

Fig. 6 Cycle performance of the NiMn-LDH film recorded at a wavelength of 550 nm

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