Electrochemical synthesis of ion exchange polymers: Comparison between hydroxide and proton conductors

Vona, Maria Luisa Di; Knauth, Philippe

doi:10.1016/j.ssi.2020.115370

Cited by 5 publications

(3 citation statements)

References 69 publications

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“…In order for the new generation of AEMs to meet the above requirements and not have drawbacks, a number of innovations are under development. AEMs with new fixed groups [ 24 ], ion-exchange matrices [ 25 ], cross-linking agents [ 26 ], inert fillers and reinforcing materials [ 27 ], as well as methods of membrane manufacturing [ 28 , 29 ] and modifications of their surfaces [ 6 , 18 , 19 ] are actively developing. These new approaches are summarized in reviews [ 6 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

Сарапулова

Pismenskaya

Titorova

et al. 2021

IJMS

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The interplay between the ion exchange capacity, water content and concentration dependences of conductivity, diffusion permeability, and counterion transport numbers (counterion permselectivity) of CJMA-3, CJMA-6 and CJMA-7 (Hefei Chemjoy Polymer Materials Co. Ltd., China) anion-exchange membranes (AEMs) is analyzed using the application of the microheterogeneous model to experimental data. The structure–properties relationship for these membranes is examined when they are bathed by NaCl and Na2SO4 solutions. These results are compared with the characteristics of the well-studied homogenous Neosepta AMX (ASTOM Corporation, Japan) and heterogeneous AMH-PES (Mega a.s., Czech Republic) anion-exchange membranes. It is found that the CJMA-6 membrane has the highest counterion permselectivity (chlorides, sulfates) among the CJMAED series membranes, very close to that of the AMX membrane. The CJMA-3 membrane has the transport characteristics close to the AMH-PES membrane. The CJMA-7 membrane has the lowest exchange capacity and the highest volume fraction of the intergel spaces filled with an equilibrium electroneutral solution. These properties predetermine the lowest counterion transport number in CJMA-7 among other investigated AEMs, which nevertheless does not fall below 0.87 even in 1.0 eq L−1 solutions of NaCl or Na2SO4. One of the reasons for the decrease in the permselectivity of CJMAED membranes is the extended macropores, which are localized at the ion-exchange material/reinforcing cloth boundaries. In relatively concentrated solutions, the electric current prefers to pass through these well-conductive but nonselective macropores rather than the highly selective but low-conductive elements of the gel phase. It is shown that the counterion permselectivity of the CJMA-7 membrane can be significantly improved by coating its surface with a dense homogeneous ion-exchange film.

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Section: Introductionmentioning

confidence: 99%

Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

Сарапулова

Pismenskaya

Titorova

et al. 2021

IJMS

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“…We have synthesized polymer electrolyte thin-films by electrochemical deposition: [51] sulfonated poly(phenyl ether), [32,52] sulfonated poly(allylphenyl ether) [33] and poly (styrene sulfonate) (PSS) [34] contain mobile cations, especially protons, whereas poly(N-vinyl-N-benzyl-N,N,N-trimeth-ylammonium) chloride (PVBTMA) and poly(allylphenyl dimethylammonium) chloride [35] contain mobile anions, especially hydroxide ions. Such ionomers present a hierarchical porous structure with a characteristic nanophase-separated morphology.…”

Section: Introductionmentioning

confidence: 99%

Ionomer Thin‐Films by Electrochemical Synthesis: Bipolar and Ampholytic Membranes

et al. 2021

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Thin-films of cation-conducting poly(styrene sulfonate) (PSS) and anion-conducting poly(N-vinyl-N-benzyl-N,N,N-trimethylammonium chloride) (PVBTMA) were electrochemically deposited. A low film thickness can be obtained, because the electrodeposition is a self-limiting process. Various cases were explored: i) the deposition of a single ionomer layer on various substrates, ii) the sequential deposition of the ionomers giving a bipolar membrane, and iii) the co-deposition of the ionomers giving an ampholytic membrane. The structure and micro-structure of the thin films were investigated by NMR spectroscopy and optical and scanning electron microscopy (SEM). Impedance spectroscopy in through-plane configuration revealed a large resistance of the bipolar membrane, due to the ionic blocking interface between the ionomers. The ampholytic membrane also showed a low conductivity, probably due to the loss of ionic carrier pairs that can leave the ionomer without break of electroneutrality.

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“…The surface of the uncoated zinc disk shows a contact angle of 91° (Figure 5a). Th much lower contact angle of 19° for the PVBTMA-coated sample (Figure 5b) is consisten with the high hydrophilicity of the ionomer due to the presence of hydrated nanometr channels [35]. It guarantees good wetting by the aqueous alkaline solution in the Zn-a battery.…”

Section: Electropolymerization Of Pvbtma On Zincmentioning

confidence: 94%

Electrodeposited Ionomer Protection Layer for Negative Electrodes in Zinc–Air Batteries

Kwarteng¹,

Syahputra²,

Pasquini³

et al. 2023

Membranes

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The protection of zinc anodes in zinc–air batteries (ZABs) is an efficient way to reduce corrosion and Zn dendrite formation and improve cyclability and battery efficiency. Anion-conducting poly(N-vinylbenzyl N,N,N-trimethylammonium)chloride (PVBTMA) thin films were electrodeposited directly on zinc metal using cyclic voltammetry. This deposition process presents a combination of advantages, including selective anion transport in PVBTMA reducing zinc crossover, high interface quality by electrodeposition improving the corrosion protection of zinc and high ionomer stiffness opposing zinc dendrite perforation. The PVBTMA layer was observed by optical and electron microscopy, and the wettability of the ionomer-coated surface was investigated by contact angle measurements. ZABs with PVBTMA-coated Zn showed an appreciable and stable open-circuit voltage both in alkaline electrolyte (1.55 V with a Pt cathode) and in miniaturized batteries (1.31 V with a carbon paper cathode). Cycling tests at 0.5 mA/cm2 within voltage limits of 2.1 and 0.8 V gave a stable discharge capacity for nearly 100 cycles with a liquid electrolyte and more than 20 cycles in miniaturized batteries. The faster degradation of the latter ZAB was attributed to the clogging of the carbon air cathode and drying or carbonation of the electrolyte sorbed in a Whatman paper.

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Electrochemical synthesis of ion exchange polymers: Comparison between hydroxide and proton conductors

Cited by 5 publications

References 69 publications

Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

Ionomer Thin‐Films by Electrochemical Synthesis: Bipolar and Ampholytic Membranes

Electrodeposited Ionomer Protection Layer for Negative Electrodes in Zinc–Air Batteries

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