Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Green Solid Electrolyte For Electrochemical Devices

12.03.2015

Researchers from the Faculty of Engineering of Universiti Teknologi MARA (UiTM), Malaysia, have studied the capability of new polymers derived from potato starch as insulators which do not show any remarkable electro activity.

The majority of all polymers are insulators which do not show any remarkable electro activity. In the past, researchers have found out how to obtain a conducting polymer by the introduction of salts, plasticizer and nanofillers.

Uniform dispersion of plasticizer and fillers in salt-polymer matrices creates a class of novel materials exhibiting superior electrical and mechanical properties which are suitable to replace many existing materials such as those for engineering applications and in electrochemical devices.

Novel material which consists of starch is one of the most common renewable and biodegradable polymers deposited as granule in plants which can be found abundantly in our country. It is composed of repeating amylose and amylopectin.

In this research work, potato starch was chosen to be the polymer host because it has a better morphology in comparison to other starch. Physically, it appeared to be soft flexible film with high conductivity compared to corn starch.

Furthermore, instead of just being a popular food item, potato starch is presently applied in the industrial field as coatings and sizing in paper, textiles and carpets as binders and adhesives, absorbents and encapsulates.

The starch based film is reported to exhibit good mechanical properties. In addition, the dry thin film of starch could also be prepared easily. Ammonium salt was chosen because it does not have a high tendency to break the starch. The thin clear films of potato starch were prepared by solution casting technique.

A certain amount of potato starch (Sigma-Aldrich) was weighed and dissolved in 50ml of acetic acid (Systerm) in a 100mL beaker and left to be stirred for 20 minutes at a certain temperature. Once the cloudy solution turns clear and it is cooled to room temperature. The solution is then doped with various amounts of ammonium salts. Later, these dry thin films were characterized via Impedance Spectroscopy, Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), and Scanning Electron Microscope (SEM).

Based on the impedance results, the conductivity of starch is low due to no mobile ions provided within the sample. The incorporation of salt increased the conductivity gradually. The higher the concentration of the ammonium salt, it actually attributed to increase in the density number of mobile ions.

The number density of charge carriers’ increased since the rate of ion dissociation has been greater than the rate of ion association. But if the salt concentration is too high, it could increase the influence of the ion pairs and higher ion aggregation, which can reduces the overall mobility and degree of freedom hence decreases the conductivity.

FTIR measurement was used to determine the interactions between salt and the polymer host. In the present work, FTIR spectroscopy was recorded using Spotlight 400 Perkin-Elmer spectrometer in the wavenumber range of 450-4000 cm_1. The FTIR spectra indicates that the complexation between starch and ammonium salt has occurred.

Upon higher concentration of the salt, hydroxyl band shifted to higher wavenumber, this maybe due to the fact that either the excess salt did not dissociate or the ions recombine to form a neutral ion pair which decreases the number of ions. From the x-ray diffractogram, three crystalline peaks are observed thus indicates the pure starch film shows semi crystalline state due to the presence of both sharp and diffuse diffraction peaks.

The fraction of amorphous phase and the charge carriers increase simultaneously with increasing ion concentration. The optimum composition of the green solid electrolyte has the potential to be used as solid electrolyte in electrical devices since it shows maximum conductivity of 10-3 and serve as an ionic conductor.

For further information contact:

UNIVERSITI TEKNOLOGI MARA
SELANGOR
INSTITUTE OF SCIENCE (IOS)
Assoc Prof AZIZAH HANOM AHMAD
azizahanom@salam.uitm.edu.my

Darmarajah Nadarajah | ResearchSEA
Further information:
http://www.uitm.edu.my
http://www.researchsea.com

More articles from Materials Sciences:

nachricht Scientists channel graphene to understand filtration and ion transport into cells
11.12.2017 | National Institute of Standards and Technology (NIST)

nachricht Successful Mechanical Testing of Nanowires
07.12.2017 | Helmholtz-Zentrum Geesthacht - Zentrum für Material- und Küstenforschung

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Long-lived storage of a photonic qubit for worldwide teleportation

12.12.2017 | Physics and Astronomy

Multi-year submarine-canyon study challenges textbook theories about turbidity currents

12.12.2017 | Earth Sciences

Electromagnetic water cloak eliminates drag and wake

12.12.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>