Most facile synthesis of Zn-Al:LDHs nanosheets at room temperature via environmentally friendly process and their high power generation by flexoelectricity. (December 2018)

• Record Type: Journal Article
• Authors: Choi, Min-Ju; Eom, Ji-Ho; Shin, Sung-Ho; Nah, Junghyo; Choi, Jin-Seok; Song, Hyun-A.; An, Hyesung; Kim, Hyun You; Pammi, S.V.N.; Choi, Goeun; Choy, Jin-Ho; Swathi, Ippili; Jella, Venkatraju; Park, Byeong-Ju; Choi, Jihoon; Yoon, Soon-Gil
• Is Part Of: Materials today energy. Volume 10(2018)
• Page Start: 254
• Page End: 263
• Publication Date: 2018-12
• Subjects: Environmentally friendly synthesis -- Zn-Al:LDH nanosheets -- Flexoelectricity -- LDH nanosheets-based generators -- High performance of energy harvesting; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2018.10.006
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: We report the zinc/aluminum layered double hydroxides (Zn-Al:LDHs) nanosheets that were most facilely synthesized at room temperature via an environmentally friendly process and demonstrate their ability to convert mechanical deformation into an electrical stimulus by flexoelectricity. The 1 μm-thick Zn-Al:LDH nanosheets were most facilely synthesized for 2 h at room temperature after dipping the Al (10 at%)-doped ZnO (10AZO) (60 nm)/Au (10 nm)/10AZO (30 nm)-coated PET samples into the carbonated water that the CO2 in air was naturally captured in the water at room temperature. Based on the nanogenerators fabricated via facilely synthesized nanosheets, we observe a linear relationship between the output voltage and current generated by the centrosymmetric LDHs nanosheets and the curvature from bending, which is a direct evidence for flexoelectricity. We demonstrated the flexoelectric coefficient of our LDH nanosheet-based flexoelectric generators of 1.8 ± 0.35 μCm −1 . The output power generated from the LDH nanosheet-based generators via a pushing shows higher performance than that from state-of-the-art flexoelectric PZT-MWCNT-based and piezoelectric BaTiO3 nanotubes-based generators. These findings could pave the way to the practical exploitation for environmentally friendly synthesis of LDH nanosheets using the CO2 in air and for harvesting the energy via LDH nanosheets-based generators. Graphical abstract: For a more straightforward synthesis of Zn-Al:LDH nanosheets with an environmentally friendly process, Al (10 at%)-doped ZnO (60-nm-thick)/Au (10-nm-thick)/Al (10 at%)-doped ZnO (30-nm-thick)/PET films were dipped into the carbonated water at room temperature for 2h and the single-crystalline nanosheets were grown perpendicular to the substrate (SEM, TEM image). The output power of the LDH nanosheet-based generators via pushing was higher than those of the flexoelectric PZT-MWCNT-based and piezoelectric BT NTs-based generators. Highlights: Most facile synthesis of Zn-Al:LDH nanosheets with environmentally friendly process. Zn-Al:LDH nanosheets grown for 2 h at room temperature using AZO multilayer films. High energy harvesting via flexoelectricity of the Zn-Al:LDH nanosheets. High flexoelectric coefficient of 1.8 ± 0.35 μCm −1 .