PVDF thin film and nanofibers for energy applications

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PVDF thin film and nanofibers for energy applications

 

Author: Song, Ruobing
Title: PVDF thin film and nanofibers for energy applications
Degree: M.Phil.
Year: 2016
Subject: Nanostructured materials.
Organic thin films.
Energy harvesting.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Applied Physics
Pages: 140 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2901185
URI: http://theses.lib.polyu.edu.hk/handle/200/8527
Abstract: The increasing demands for clean, reliable and sustainable energy require researchers to develop highly efficient and environmentally friendly energy harvesting/storage devices. Nowadays, renewable energy already occupies a bigger share of the world's energy demand pie, and still keeps growing. Mechanical and solar energy are ubiquitous in our daily life. In this work, we focus on studying the use of Polyvinylidene fluoride (PVDF) as a component in the mechanical and solar energy harvester. PVDF has attracted extensive interest for decades due to its unique piezoelectric and ferroelectric properties, high chemical and thermal stability. In addition, PVDF is intrinsically an organic, which allows it to be fabricated by low-cost methods and engineered to be PVDF thin film or PVDF based nanofiber.
Recent works have shown considerable attention towards self-powered energy source by scavenging energy from ambient environments. The integration of energy harvesting and energy storage device is a way that not only enables to convert ambient energy into electricity but also provides sustainable power source for various electronic devices and systems. It is highly desirable to improve the integration level and minimize unnecessary energy loss in the power-management circuits between energy harvesting and storage devices. In our study, we fabricated a device composed of supercapacitor and piezoelectric nanogenerator. PVDF thin film membrane was integrated as a component both the separator and the energy harvester in a supercapacitor to form a rectification-free devices for one-step energy conversion and storage. In this device, externally mechanical impact establishes a piezoelectric potential across the PVDF film, which serves as a driving force for the migration of ions towards the interface of functionalized carbon cloth electrodes and stores the electricity in the form of electrochemical energy. Transparent electrode is an indispensable component for solar cell. The thin and flexible transparent electrodes with excellent conductivity and good transmittance are highly desirable in industry. Ag nanofibers (Ag NFs) networks have been shown with high transmittance, low resistance and excellent flexibility. The contact resistance between two nanofibers junction hinders the further reduction of the sheet resistance of Ag NFs networks. In our work, Ag NFs electrode was produced by combining electrospun PVDF nanofibers with electroless metallic deposition technique. The fabrication parameters of PVDF nanofibers were systematically investigated for obtaining high quality nanofibers. Then, the PVDF nanofibers worked as template for the Ag electroless deposition at ambient temperature.

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