Phase separation of a PVDF–HFP film on an ice substrate to achieve self-polarisation alignment

Liu, Yu-Lun; Tong, Wangshu; Wang, Lingchao; Zhang, Panpan; Zhang, Jiahe; Wang, Xuemei; Zhang, Shuai; Liu, Ya; Liu, Songling; Wang, Shengqian; Chai, Mengnan; Zhang, Yihe

doi:10.1016/j.nanoen.2022.108082

Cited by 19 publications

(3 citation statements)

References 39 publications

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“…In order to deeply characterize the piezoelectric properties of the materials, the three PI piezocatalysts were made into piezoelectric nanogenerators (PENGs) to test their open circuit voltage (V oc ) and charge amount. 45,46 The samples were pressed into disc-like pellets having a diameter of 1 cm and an area of This journal is © The Royal Society of Chemistry 2024 0.785 cm 2 , and thus the stress per unit area was 0.191 MPa (1.91 × 10 5 N m −2 ) when a vertical stress of 15 N was applied. Clearly, compared with PM-1 and PM-2, PM-3 presents the highest output voltage and charge under the vertical stress (Fig.…”

Section: Piezocatalytic Mechanism Investigationmentioning

confidence: 99%

Organic piezocatalyst polyimide: molecular structure tailoring and robust built-in electric field

Zhang,

Liu,

et al. 2024

J. Mater. Chem. A

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Section: Piezocatalytic Mechanism Investigationmentioning

confidence: 99%

Organic piezocatalyst polyimide: molecular structure tailoring and robust built-in electric field

Zhang,

Liu,

et al. 2024

J. Mater. Chem. A

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“…Poly(vinylidene uoride) (PVDF) and its copolymers such as poly(vinylidene uoride-cohexa uoropropylene) (PVDF-HFP) and poly(vinylidene uoride-co-tri uoroethylene) (PVDF-TrFE) are widely reported for their piezoelectric performance [1][2][3]. This is mainly due to the semi-crystalline nature, electroactive phases, macroscopic polarization and exibility of the polymers [4]. Major manufacturing processes of PVDF-based composites and nanocomposites for fabricating self-powering devices include electrospinning, hot pressing and electric polarization methods like corona poling [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Phase separation only happened on the lm surface facing H 2 O, which resulted in self-polarization and alignment of electroactive dipoles, with a high output voltage of 1.16 V [4]. Hybrid heterojunctions of zinc oxide (ZnO)/poly(3-hexylthiophene-2,5-diyl) (P3HT) composite are coupled with phase separation fabrication method to achieve good piezoelectric response for the composites by Shin et al [9].…”

Section: Introductionmentioning

confidence: 99%

Engineering piezoelectric efficiency in phase-separated PVDF nanocomposites using In 2 O 3 -ZnO heterostructure

Yempally,

Bhapkar,

Prasad

et al. 2024

Preprint

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The current research explores the piezoelectric output voltage efficiency of polyvinylidene fluoride (PVDF) nanocomposites containing In2O3-ZnO heterostructure fabricated by the phase separation methodology. Non-solvent induced phase separation using octanol creates uniform pores and spherulites within the polymer composites. Heterostructures of nanomaterials of ZnO quasi-spherical interface with In2O3 crystalline nucleus enhances the number of crystallites with reduced size, thereby contributing to the piezoelectric performance. Phase separation creates granular and rough surface morphology for the PVDF spherulites with advancement in the β-phase, which is the major reason for power generation. A specific circular sample of 2% PVDF/IZO with a diameter of 3cm and thickness of ~ 150 µm produced the highest output voltage of 1.32 V, almost 26 times higher than that obtained from the neat PVDF film of the same dimension. The study highlights the application of phase separation as a cost-effective self-polarization strategy to considerably increase the phase content and, thereby, sustainable energy harvesting.

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Chiral Polar Bifunctional Polyimide Enantiomers for Asymmetric Photo‐ and Piezo‐Catalysis

Zhang,

Sun,

Ren

et al. 2024

Angewandte Chemie

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Chiral catalysts for asymmetric catalysis represent a crucial research focus in chemistry and materials science. However, a few cases about chiral‐dependent photocatalysts primarily focus on plasmonic noble metals. Particularly, developing chiral nano‐catalysts that can be driven by mechanical energy remains in the blank stage. Herein, organic polymer‐based enantiomers, chiral polar polyimide (PI) microspheric nano‐assembly are synthesized as novel bifunctional catalysts for asymmetric photocatalysis and piezocatalysis. The PI catalyst enantiomers present enantioselectivity towards left‐ and right‐circularly polarized light, demonstrating chiral‐dependent H2O2 photoproduction. Interestingly, enantioselectivity of the catalyst reverses under irradiation of different bands, presenting tunability in the interaction between chiral catalysts and circularly polarized light. For the first time, enantioselective piezocatalytic behavior is demonstrated by the chiral polar PI catalysts. They show remarkable chiral preference for asymmetric Diels‐Alder reaction and enantioselective conversion of tyrosine substrates under ultrasonic vibration. The findings provide a new perspective into exploring metal‐free chiral catalysts and their asymmetric catalysis applications across multiple energy forms.

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Phase separation of a PVDF–HFP film on an ice substrate to achieve self-polarisation alignment

Cited by 19 publications

References 39 publications

Organic piezocatalyst polyimide: molecular structure tailoring and robust built-in electric field

Organic piezocatalyst polyimide: molecular structure tailoring and robust built-in electric field

Engineering piezoelectric efficiency in phase-separated PVDF nanocomposites using In 2 O 3 -ZnO heterostructure

Chiral Polar Bifunctional Polyimide Enantiomers for Asymmetric Photo‐ and Piezo‐Catalysis

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