Hydrogen bond cross-linked sulfonated poly(imino ether ether ketone) (PIEEK) for fuel cell membranes

Chang, Guanjun; Shang, Zhenfang; Yang, Li

doi:10.1016/j.jpowsour.2015.02.077

Cited by 21 publications

(10 citation statements)

References 34 publications

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“…In brief, all membranes were stable up to 240 °C, which was sufficient to meet PEM requirements in fuel cells. [24] Fuel cells will inevitably be subjected to thermal expansion and external stresses during operation, so mechanically robust PEMs were critical for fuel cell applications. Figure 7 and Table 1 display the stress-strain curves and mechanical property test results for SPEEK and SPEEK/CNTsÀ C@NÀ Y composite membranes.…”

Section: Thermal and Mechanical Properties Of Composite Membranesmentioning

confidence: 99%

Dual Proton Conducting Channels Constructed by Acid‐Base Double‐Shell Carbon Nanotubes to Boost the Proton Conductivity of SPEEK

et al. 2022

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Sulfonated poly(ether ether ketone) (SPEEK) has been widely investigated as a substitution of commercial Nafion as proton exchange membranes (PEMs). However, the disadvantages such as shrinkage of proton transfer channels at high temperature and low humidity conditions cannot be neglected. In this manuscript, the carboxyl and imidazole double‐shelled carbon nanotubes(CNTs−C@N) was incorporated into the SPEEK matrix to fabricate composite PEM (denoted as SPEEK/CNTs−C@N−Y, Y is the percentage composition of CNTs−C@N), serving as one‐dimensional fillers. SPEEK/CNTs−C@N‐1.0 composite membrane performed a higher horizontal proton conductivity (0.302 S/cm) under 80 °C and 100 % relative humidity (RH) compared with original SPEEK membrane 0.181 S/cm. The high proton conductivity could be mainly attributed to the dual proton conducting channel formed by two types of acid‐base pairs, which immensely promote the Grotthuss mechanism. Therefore, SPEEK/CNTs−C@N composite membranes are expected to develop PEMs with high proton conductivity at high temperature and low humidity.

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Section: Thermal and Mechanical Properties Of Composite Membranesmentioning

confidence: 99%

Dual Proton Conducting Channels Constructed by Acid‐Base Double‐Shell Carbon Nanotubes to Boost the Proton Conductivity of SPEEK

et al. 2022

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“…All blend membranes showed much higher mechanical strength than the pristine BPSH60 membrane (Figure 5), which indicated that the introduction of hydroxyl group-containing polymers (PES-OH60 and SPES40-OH40) enhances inter-molecular interactions by promoting hydrogen bonding among hydroxyl groups and between hydroxyl groups and sulfonic acid groups. [32,[38][39][40] However, when more than a certain amount of the hydroxyl group-containing polymers are introduced into the blend film, the mechanical properties tend to decrease. This may be due to an increase in the non-uniformity of the electrolyte membrane.…”

Section: Iec Water Uptake and Swelling Behaviors Of Blend Membranesmentioning

confidence: 99%

Reinforced Polymer Blend Membranes with Liposome‐Like Morphology for Polymer Electrolyte Membrane Fuel Cells Operating under Low‐Humidity Conditions

et al. 2020

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Polymer electrolyte membrane fuel cells (PEMFCs) attract much attention as eco-friendly clean energy sources for transportation and stationary applications. [1,2] Proton-exchange membranes (PEMs) are essential components of these cells, acting as 1) separators to prevent the mixing of anode and cathode fuels and 2) conductors to aid the transport of protons from the anode to the cathode. Practically applicable PEMs should exhibit chemical, mechanical, and dimensional stability to fulfill the requirements of role 1) [3] and should maintain their proton conductivity even at low relative humidity (RH) to comply with the requirements of role 2). [1,4] The current state of the art is represented by perfluorosulfonic acid (PFSA) PEMs (e.g., Nafion), which exhibit high proton conductivity, superior mechanical properties, and chemical stability but suffer from high cost, high fuel permeability, and difficulty of structure/property modification. These drawbacks, together with the recent environmental and regulation issues regarding polyfluoroalkyl substances, have inspired the development of non-PFSA PEMs. [5] Sulfonated hydrocarbon-based PEMs, which offer superior thermal stability, low cost, and versatility of polymer types and can be synthesized from a variety monomers, have been investigated as promising alternatives to conventional PEMs. [6] However, the low mechanical stability of these membranes as separators and their low performance as proton conductors (particularly under low-humidity conditions) present an obstacle to usage in practical fuel cells. [7][8][9] To date, several solutions, such as physicochemical bonding (e.g., cross-liking and hydrogen bonding) [10][11][12] and hydrophilic-hydrophobic phase separation (e.g., multi-block copolymers, [13,14] comb-type PEMs, [12,15] densely sulfonated, [16] and organic/inorganic composites [17] ), have been suggested to build well-defined proton-conducting channels and, thus, obtain high proton conductivity and mechanical strength at low RH. Among them, one of the most interesting and easily applicable strategies is the construction of organic-inorganic composite membranes with functionalized inorganic fillers via the modification of aromatic polymer membranes with a high degree of sulfonation (DS). [17]

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“…The -OH group can be obtained by the demethylation of the methoxy group (Figure 16.8a) . And the -NH-and -CO-groups could be introduced by using various functional monomers during the polymerizing reaction (Figure 16.8b) (Chang et al, 2015). Afterwards, the hydrogen-bond network can be readily obtained by heat treatment during the membrane preparation process.…”

Section: Hydrogen Bond Cross-linkingmentioning

confidence: 99%

Advanced Materials for Polymeric Ultrafiltration Membranes Fabrication and Modification

Muhamad¹,

Nazri²,

Lau³

et al. 2018

Advanced Materials for Membrane Fabrication and Modification

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Hydrogen bond cross-linked sulfonated poly(imino ether ether ketone) (PIEEK) for fuel cell membranes

Cited by 21 publications

References 34 publications

Dual Proton Conducting Channels Constructed by Acid‐Base Double‐Shell Carbon Nanotubes to Boost the Proton Conductivity of SPEEK

Dual Proton Conducting Channels Constructed by Acid‐Base Double‐Shell Carbon Nanotubes to Boost the Proton Conductivity of SPEEK

Reinforced Polymer Blend Membranes with Liposome‐Like Morphology for Polymer Electrolyte Membrane Fuel Cells Operating under Low‐Humidity Conditions

Advanced Materials for Polymeric Ultrafiltration Membranes Fabrication and Modification

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