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research-article

Graphite supported silica immobilized phosphotungstic acid (Si-PWA) based ion-conducting inorganic membrane

[+] Author and Article Information
Jay Pandey

Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India
jay.pandey.iitd@gmail.com

Murali M. Seepana

National Institute of Technology Warangal-506004, Telangana, India
murali@nitw.ac.in

1Corresponding author.

ASME doi:10.1115/1.4040203 History: Received January 23, 2018; Revised April 26, 2018

Abstract

An asymmetric, inorganic ion-conducting membrane was synthesized by depositing a top layer containing silica-immobilized phosphotungstic acid (Si-PWA) over a graphite sheet. Surface morphology, thermal stability, and structure of the top layer of the membrane were studied using SEM, TGA, XRD, and FT-IR respectively. The transport number and specific conductivity of the membrane were measured using membrane potential and impedance measurements respectively. The composition of the top layer was varied by changing the molar ratio of PWA and TEOS in the casting sol. The transport number and specific conductivity of the membrane increased on increasing PWA fraction in the casting solution. The highest transport number for sodium ion was 0.98 for PWA: TEOS molar ratio of 1.5. Specific conductivity of the membrane, with 0.5 PWA: TEOS, was 0.0082 Scm-1 which was lower compared to the membrane with 1.5 PWA: TEOS of specific conductivity 0.017 Scm-1. The specific conductivity of the membrane increased with increase in the temperature for both 0.5 and 1.5 molar ratio of PWA: TEOS with the calculated activation energy 18.9 and 8.8 kJ/mol, respectively.

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