Calcium hydroxyphosphategraphene nafion composite membrane to improve direct methanol fuel cell performance

Name: Dhanawich Taechaboonsermsak

LCSH: Kasetsart University -- Theses. M.Eng. (Chemical Engineering) 2019

Classification :.LCCS: TP159.M4

LCSH: Kasetsart University. -- Department of Chemical Engineering -- Theses

LCSH: Membranes (Technology)

LCSH: Nafion membrane

LCSH: Graphene oxide

LCSH: Calcium hydroxyphosphate

LCSH: Methanol as fuel

LCSH: Fuel cells

Abstract: Nafion is a widely used membrane in direct methanol fuel cell (DMFC). Many advantages of Nafion including good chemical stability, good thermal resistance, and high proton conductivity. However, Nafion has high methanol crossover which remarkably reduces the performance of DMFC and results in waste of fuel. Therefore, in this work, two solution casting method were employed and compared. The filler materials, which were calcium hydroxy phosphate (CHP) and silane-graphene oxide (SGO), were characterized by FTIR and XRD. They were incorporated into Nafion to reduce the methanol crossover. The properties of CHP/Nafion and SGO-CHP/Nafion such as crystallinity, water uptake, ion exchange capacity, chemical degradation, and solubility were studied ex-situ. SEM/EDS with elemental mapping was used to observe the dispersion of CHP and SGO within the membrane. The proton conductivity, performance, durability, and methanol crossover were tested in-situ using electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and polarization curve (IV). FTIR of SGO confirmed that SGO was successfully synthesized using the modified method. SEM/EDS images of SGO-CHP/Nafion suggested that CHP and SGO had good dispersion within Nafion membrane. However, as the content of CHP increased, the CHP dispersion within Nafion membrane became worse due to the agglomeration of the filler material. The composite membrane showed better performance than that of pure recast Nafion membrane because of its lower methanol crossover.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Paweena Prapainainar

Role: Thesis Advisor

Name: Paisan Kongkachuichay

Role: Thesis CO-Advisor

Created: 2019

Modified: 2025-07-05

Issued: 2025-07-05

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2562/dhanawich-tae-all.pdf

CallNumber: TP159.M4 .D42

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Chemical Engineering

Grantor: Kasetsart University

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