Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices

Noriah Abdul Rahman, Sharina Abu Hanifah, Nadhratun Naiim Mobarak, Mohd Sukor Su'ait, Azizan Ahmad, Kee Shyuan Loh, Lee Tian Khoon

Research output: Contribution to journalArticle

Abstract

For the past decade, much attention was focused on polysaccharide natural resources for various purposes. Throughout the works, several efforts were reported to prepare new function of chitosan by chemical modifications for renewable energy, such as fuel cell application. This paper focuses on synthesis of the chitosan derivative, namely, O-nitrochitosan which was synthesized at various compositions of sodium hydroxide and reacted with nitric acid fume. Its potential as biopolymer electrolytes was studied. The substitution of nitro group was analyzed by using Attenuated Total Reflectance Fourier Transform Infra-Red (ATR-FTIR) analysis, Nuclear Magnetic Resonance (NMR) and Elemental Analysis (CHNS). The structure was characterized by X-ray Diffraction (XRD) and its thermal properties were examined by using differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Whereas, the ionic conductivity of the samples was analyzed by electrochemical impedance spectroscopy (EIS). From the IR spectrum results, the nitro group peaks of O-nitrochitosan, positioned at 1646 and 1355 cm -1 , were clearly seen for all pH media. At pH 6, O-nitrochitosan exhibited the highest degree of substitution at 0.74 when analyzed by CHNS analysis and NMR further proved that C-6 of glucosamine ring was shifted to the higher field. However, the thermal stability and glass transition temperatures were decreased with acidic condition. The highest ionic conductivity of O-nitrochitosan was obtained at ~10 −6 cm -1 . Overall, the electrochemical property of new O-nitrochitosan showed a good improvement as compared to chitosan and other chitosan derivatives. Hence, O-nitrochitosan is a promising biopolymer electrolyte and has the potential to be applied in electrochemical devices.

Original languageEnglish
Article numbere0212066
JournalPLoS ONE
Volume14
Issue number2
DOIs
Publication statusPublished - 1 Feb 2019

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Biopolymers
biopolymers
Chitosan
chitosan
Electrolytes
electrolytes
Equipment and Supplies
synthesis
Hot Temperature
Ionic conductivity
nuclear magnetic resonance spectroscopy
Substitution reactions
Magnetic Resonance Spectroscopy
chemical derivatives
Nuclear magnetic resonance
fuel cells
Renewable Energy
dielectric spectroscopy
thermogravimetry
Derivatives

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices. / Rahman, Noriah Abdul; Abu Hanifah, Sharina; Mobarak, Nadhratun Naiim; Su'ait, Mohd Sukor; Ahmad, Azizan; Loh, Kee Shyuan; Khoon, Lee Tian.

In: PLoS ONE, Vol. 14, No. 2, e0212066, 01.02.2019.

Research output: Contribution to journalArticle

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