Ahmad Salihin Samsudin

Bio: Ahmad Salihin Samsudin is an academic researcher from Universiti Malaysia Pahang. The author has contributed to research in topics: Ionic conductivity & Electrolyte. The author has an hindex of 19, co-authored 74 publications receiving 1025 citations. Previous affiliations of Ahmad Salihin Samsudin include Universiti Malaysia Terengganu.

Characterization on the potential of carboxy methylcellulose for application as proton conducting biopolymer electrolytes

Abstract: article i nfo The development of new biopolymer electrolytes (BEs) based on carboxy methylcellulose (CMC) has been accomplished by incorporating dodecyltrimethyl ammonium bromide (DTAB) to the polymer-salt system via solution-cast technique. The polymer-salt complex formation and the polymer-proton interactions have been analyzed through Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) mea- surement, impedance measurement and Transference number measurement (TNM). The highest conductiv- ity at room temperature is 7.72×10 �4 Scm �1 for sample containing 35 wt. % DTAB. The temperature dependence of the BEs system exhibits Arrhenius behavior. The conductivity of the samples was found to be dependent on the number of mobile ions and the mobility of the ions. It has been shown that the conduct- ing species in this present work are predominantly due to proton (H + ) which was confirmed via FTIR and TNM analysis. The results suggest that BEs system is highly potential to be applied in electrochemical devices, i.e. proton battery and fuel cell.

Reducing crystallinity on thin film based CMC/PVA hybrid polymer for application as a host in polymer electrolytes

Abstract: The carboxymethyl cellulose and polyvinyl alcohol (CMC/PVA) based hybrid polymer (HPe) system with different ratio of composition have been prepared via solution casting. The features of interaction between CMC and PVA were investigated using X-ray diffraction (XRD), and infrared (IR) spectroscopy to disclose the reduction of crystallinity of the HPe system. Morphological properties observed by Scanning electron microscopy (SEM) confirmed the homogeneity of the HPe system. Differential scanning calorimetry (DSC) result explains the miscibility of the HPe system which was confirmed by means of variations in the glass transition temperature (Tg). Two degradation mechanisms were revealed by thermogravimetric analysis (TGA) in the HPe system attributed to the decarboxylation in CMC and degradation of bond scission in PVA backbone. The blend of 80:20 compositions of CMC/PVA HPe system was found to be the optimum ratio with an increase in conductivity of CMC/PVA by one magnitude order from 10−7 to 10−6 S/cm with the lowest in crystallinity.

Structural and Electrical Properties of Carboxy Methylcellulose-Dodecyltrimethyl Ammonium Bromide-Based Biopolymer Electrolytes System

Abstract: Biopolymer electrolyte films based on carboxy methylcellulose (CMC) complexed with dodecyltrimethyl ammonium bromide (DTAB) salt with compositions between 5 and 40 wt.% have been prepared using the solution cast method as a possible proton-conducting polymer electrolyte system. The polymer–salt complex formation and the polymer–proton interactions have been analyzed. Electrical properties have been measured as a function of composition and temperature using complex impedance spectroscopy and exhibited the highest room temperature conductivity of 10−4 Scm−1. A small polaron hopping (SPH) model has been found to be most appropriate for fitting the experimental conductivity data.

Ultracapacitors: Why, How, and Where is the Technology

Abstract: The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting polymers. More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes. The energy density of these devices is 3¯5 Wh/kg with a power density of 300¯500 W/kg for high efficiency (90¯95%) charge/discharges. Projections of future developments using carbon indicate that energy densities of 10 Wh/kg or higher are likely with power densities of 1¯2 kW/kg. A key problem in the fabrication of these advanced devices is the bonding of the thin electrodes to a current collector such the contact resistance is less than 0.1 cm2. Special attention is given in the paper to comparing the power density characteristics of ultracapacitors and batteries. The comparisons should be made at the same charge/discharge efficiency.

Introduction to Spectroscopy

Abstract: Spectroscopy is the study of matter interacting with electromagnetic radiation (e.g., light). The electromagnetic spectrum in Figure 1 illustrates the many different types of electromagnetic radiation, including gamma rays (γ-rays), X-rays, ultraviolet (UV) radiation, visible light, infrared (IR) radiation, microwaves, and radio waves. The frequency (ν) and wavelength (λ) ranges associated with each form of radiant energy are also indicated in Figure 1.

Characterization on the potential of carboxy methylcellulose for application as proton conducting biopolymer electrolytes

Abstract: article i nfo The development of new biopolymer electrolytes (BEs) based on carboxy methylcellulose (CMC) has been accomplished by incorporating dodecyltrimethyl ammonium bromide (DTAB) to the polymer-salt system via solution-cast technique. The polymer-salt complex formation and the polymer-proton interactions have been analyzed through Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) mea- surement, impedance measurement and Transference number measurement (TNM). The highest conductiv- ity at room temperature is 7.72×10 �4 Scm �1 for sample containing 35 wt. % DTAB. The temperature dependence of the BEs system exhibits Arrhenius behavior. The conductivity of the samples was found to be dependent on the number of mobile ions and the mobility of the ions. It has been shown that the conduct- ing species in this present work are predominantly due to proton (H + ) which was confirmed via FTIR and TNM analysis. The results suggest that BEs system is highly potential to be applied in electrochemical devices, i.e. proton battery and fuel cell.