Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61722
Title: A new strategy for designing high-performance sulfonated poly(ether ether ketone) polymer electrolyte membranes using inorganic proton conductor-functionalized carbon nanotubes
Authors: Gong, C
Zheng, X
Liu, H
Wang, G
Cheng, F
Zheng, G
Wen, S
Law, WC 
Tsui, CP 
Tang, CY 
Keywords: Boron phosphate
Carbon nanotubes
Fuel cells
Proton exchange membrane
Sulfonated poly(ether ether ketone)
Issue Date: 2016
Publisher: Elsevier
Source: Journal of power sources, 2016, v. 325, p. 453-464 How to cite?
Journal: Journal of power sources 
Abstract: Remarkable progress has been made on the use of polymer electrolyte membranes (PEMs) for renewable-energy-related research. In particular, carbon nanotubes (CNTs) have emerged as versatile nanomaterials to modify PEMs. However, the inert ionic conduction ability and possible short-circuiting risk are the two major obstacles to their further development. In this work, CNTs are firstly functionalized with an inorganic proton conductor, boron phosphate (BPO4), using a facile polydopamine-assisted sol-gel method to yield BPO4@CNTs. This new additive is then used to modify sulfonated poly(ether ether ketone) (SPEEK). Polydopamine coating layer can act as an extraordinary glue to homogeneously adhere BPO4 nanoparticles on CNTs, thereby not only reducing the risk of short-circuiting, but also fabricating new proton-conducting pathways in the composite membranes. A comprehensive characterization reveals that the thermal stability, tensile properties, and dimensional stability of PEMs are significantly improved. Compared with pure SPEEK, the proton conductivity of SPEEK/BPO4@CNTs-2 is improved by 45% and 150% at 20 °C and at 80 °C, respectively. Furthermore, the H2/O2 cell performance of SPEEK/BPO4@CNTs-2 membrane exhibits a peak power density of 340.7 mW cm-2 at 70 °C, which is significantly better than that of pure SPEEK (254.2 mW cm-2), demonstrating the great potential of proton conductors-functionalized CNTs in PEMs.
URI: http://hdl.handle.net/10397/61722
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2016.06.061
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