Hydroxide ion transfer in anion exchange membrane: A density functional theory study

Yang, Guoqing; Hao, Juanyuan; Cheng, Jie; Zhang, Ning; Zhang, Fengxiang; Hao, Ce

doi:10.1016/j.ijhydene.2016.03.067

Cited by 36 publications

(29 citation statements)

References 43 publications

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“…Previous studies indicated that the functional group in the side chain had a significant influence on the interaction with the chemical species during the reaction. 28,29 On the contrary, the carbon chain itself is inert to the chemical bond formation with other species, and thus we assume their effects negligible. Another past study as to the chemical structure of proton exchange membrane (PEM) proposed that the functional groups in the side chains are randomly located.…”

Section: Theoretical Analysis Of the Interaction Between Aem And Chemmentioning

confidence: 99%

Direct Formation of Metal Layer on Anion Exchange Membrane Using Electroless Deposition Process

et al. 2021

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In this work, a novel electroless deposition process on the anion exchange membrane (AEM) is proposed. AEM surface has a positively charged functional group, which in general do not allow the catalyst particle, such as Pd, to be formed on the surface. Hence, a different strategy from the conventional catalyzation process was required. We found that the sensitization process using Sn-containing solution, which is widely applied in the electroless plating on nonconductive substrates, hindered the Pd particle modification, which hence inhibited the following deposition reaction. Our several experiments and density functional theory analyses suggest that for Pd particle modification, anion in the bath turned out to play a key role. In particular, Cl − provides the sufficiently strong connection between the precursor Pd 2+ and positive functional group of the substrate. This leads to favorable deposition of Pd catalyst particles and metal layer formation on the AEM. Therefore, we conclude that just a single pre-treatment to immerse the AEM films into PdCl 2 /HCl solution is capable to perform electroless plating on it. We applied the novel process to the electrode formation, such as Pt and NiP , on the AEM for hydrogen evolution reaction (HER) as a case study. Both Pt and NiP was successfully formed on the AEM. The electrochemical measurements show that those electrodes are able to serve as the catalytic electrode for HER. The electroless process proposed here opens possibility of the direct metal fabrication on ion exchange membrane surface.

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Section: Theoretical Analysis Of the Interaction Between Aem And Chemmentioning

confidence: 99%

Direct Formation of Metal Layer on Anion Exchange Membrane Using Electroless Deposition Process

et al. 2021

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“…As an efficient, clean, and zero-emission power generation technology, fuel cells can effectively solve energy crises and environmental pollution issues as the focus of global governments. Compared with other types of fuel cells, the ones with alkaline anion exchange membranes have attracted wide attention because of: (1) Low working temperature (60–90 °C); (2) high rate of oxygen reduction reaction and catalytic stability, which can decrease the Pt amount or use non-noble metal catalysts such as Ag and Ni instead, thus significantly reducing the cost; (3) low fuel permeability (permeability of methanol: <10 −6 m −2 s); and (4) facile water and heat management [1,2,3]. Alkaline anion exchange membranes are one of the essential components of alkaline fuel cells and are capable of blocking fuel and conducting OH − .…”

Section: Introductionmentioning

confidence: 99%

Hydroxide Conduction Enhancement of Chitosan Membranes by Functionalized MXene

Wang

Shi

2018

Materials

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In this study, imidazolium brushes tethered by –NH2-containing ligands were grafted onto the surface of a 2D material, MXene, using precipitation polymerization followed by quaternization. Functionalized MXene was embedded into chitosan matrix to prepare a hybrid alkaline anion exchange membrane. Due to high interfacial compatibility, functionalized MXene was homogeneously dispersed in chitosan matrix, generating continuous ion conduction channels and then greatly enhancing OH− conduction property (up to 172%). The ability and mechanism of OH− conduction in the membrane were elaborated based on systematic tests. The mechanical-thermal stability and swelling resistance of the membrane were evidently augmented. Therefore, it is a promising anion exchange membrane for alkaline fuel cell application.

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“…Above 50°C, the motion range of phosphonium cations increased obviously. This free shuttling behavior with an extensive motion range is believed to refine bulk anions' conduction mechanism, by providing extra solvation shell fluctuation [21] and reducing the energy barrier when transferring between two cationic groups [19]. AEMs were prepared from the free shuttling polyrotaxane 5 via solution casting method.…”

Section: Resultsmentioning

confidence: 99%

Fast Bulky Anion Conduction Enabled by Free Shuttling Phosphonium Cations

Zhang

et al. 2021

Research

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Highly conductive anion-exchange membranes (AEMs) are desirable for applications in various energy storage and conversion technologies. However, conventional AEMs with bulky HCO3- or Br- as counterion generally exhibit low conductivity because the covalent bonding restrains the tethered cationic group’s mobility and rotation. Here, we report an alternative polyrotaxane AEM with nontethered and free-shuttling phosphonium cation. As proved by temperature-dependent NMR, solid-state NMR, and molecular dynamics simulation, the phosphonium cation possesses a thermally trigged shuttling behavior, broader extension range, and greater mobility, thus accelerating the diffusion conduction of bulky anions. Owing to this striking feature, high HCO3- conductivity of 105 mS cm-1 at 90°C was obtained at a relatively lower ion-exchange capacity of 1.17 mmol g-1. This study provides a new concept for developing highly conductive anion-exchange membranes and will catalyze the exploration of new applications for polyrotaxanes in ion conduction processes.

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Hydroxide ion transfer in anion exchange membrane: A density functional theory study

Cited by 36 publications

References 43 publications

Direct Formation of Metal Layer on Anion Exchange Membrane Using Electroless Deposition Process

Direct Formation of Metal Layer on Anion Exchange Membrane Using Electroless Deposition Process

Hydroxide Conduction Enhancement of Chitosan Membranes by Functionalized MXene

Fast Bulky Anion Conduction Enabled by Free Shuttling Phosphonium Cations

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