Enhancing the selectivity of Nafion membrane by incorporating a novel functional skeleton molecule to improve the performance of direct methanol fuel cells

Li, Jialin; Bu, Fanzhe; Ru, Chunyu; Jiang, Hao; Duan, Yuting; Sun, Yunfei; Pu, Xingtong; Shang, Lichao; Li, Xifang; Zhao, Chengji

doi:10.1039/c9ta10215a

Cited by 52 publications

(26 citation statements)

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“…The improvement on σ was benefited from more carriers participating proton transfer process and the reduction of proton conduction resistance. Moreover, Zhao reported that membranes with a closer distance between the internal functional groups would have a higher conductivity 51 . Activation energy ( Ea ) was calculated according to Equation S5 for better understanding proton conduction behaviors in membranes.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, Zhao reported that membranes with a closer distance between the internal functional groups would have a higher conductivity. 51 Activation energy (Ea) was calculated according to Equation S5 for better understanding proton conduction behaviors in membranes. The relationship between σ and temperature was expressed well, and Ea values could be obtained from the Arrhenius' law ( Figure S3).…”

Section: Proton Conductivitymentioning

confidence: 99%

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Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

et al. 2020

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Freeze-drying (fd) technique is an effective and facile method to accumulate nanofibers for membrane preparation, and it has been frequently reported in the development of energy materials. Kevlar as amide nanofibers (ANFs) could serve as support materials for proton exchange membranes (PEMs) owing to the merits of exceptional stiffness and strength, etc. The aim of this research is to enhance the proton conductivity of phosphoric acid (PA)-doped Kevlar membranes by incorporating polyacrylamide (PAM) and 1-butyl-3-methylimidazolium chloride (bmimCl) with freeze-drying technique. The components of PAM and bmimCl could provide the binding sites to combine PA molecules with the formation of Kevlar/PAM/bmimCl/PA membranes. Furthermore, the prepared membranes with the freeze-drying posttreatment are substantially more effective at enhancing proton conductivity owing to the combination of more PA molecules. Specifically, Kevlar/PAM/bmimCl(fd)/PA membranes showed the anhydrous proton conductivity of 2.64 × 10 −1 S/cm at 180 C and 1.04 × 10 −1 S/cm at 140 C in a 270-hour non-stop test. As regard to the prepared PA-doped Kevlar/CdTe-based membranes, the mechanical strength was far from what was expected. Comparing to the solution casting method, the freeze-drying technique was a feasible strategy to deal with ANFs for exploiting high-temperature PEMs with high performance.

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Section: Resultsmentioning

confidence: 99%

Section: Proton Conductivitymentioning

confidence: 99%

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

et al. 2020

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“…It is one of the most exploited membranes for DMFC by virtue of excellent proton conductivity and outstanding chemical and thermal stability. In addition, Nafion can be successfully blended and/or modified with other polymers for enhanced performance [ 13 , 14 , 15 , 16 , 17 ]. The major shortcoming of Nafion-based DMFCs is the high methanol crossover, many advances have been proposed to improve the performance of Nafion as a fuel cell polymer electrolyte such as crosslinking, acid treatment, electrical field treatment, and ultraviolet curing [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Proton Conductive, Low Methanol Crossover Cellulose-Based Membranes

2021

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This work describes the development of sulfated cellulose (SC) polymer and explores its potential as an electrolyte-membrane for direct methanol fuel cells (DMFC). The fabrication of our membranes was initiated by the preparation of the novel sulfated cellulose solution via controlled acid hydrolysis of microcrystalline cellulose (MCC). Ion-conductive crosslinked SC membranes were prepared following a chemical crosslinking reaction. SC solution was chemically crosslinked with glutaraldehyde (GA) and cured at 30 °C to produce the aforementioned membranes. Effects of GA concentration on methanol permeability, proton conductivity, water uptake and thermal stabilities were investigated. The crosslinking reaction is confirmed by FTIR technique where a bond between the primary OH groups of cellulose and the GA aldehyde groups was achieved, leading to the increased hydrophobic backbone domains in the membrane. The results show that the time of crosslinking reaction highly affects the proton conduction and methanol permeability. The proton conductivity and methanol crossover (3M) of our GA crosslinked SC membranes are 3.7 × 10−2 mS cm−1 and 8.2 × 10−9 cm2 s−1, respectively. Crosslinked sulfated cellulose films have lower ion conductivity than the state-of-the-art Nafion (10.2 mS cm−1); however, the methanol crossover is three orders of magnitude lower than Nafion membranes (1.0 × 10−5 cm2 s−1 at 1 M). Such biofilms with high methanol resistivity address the major hurdle that prevents the widespread applications of direct alcohol fuel cells.

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“…Among the various organic H 2 carriers, [ 14–17 ] formate has recently gained widespread attention due to its environmentally friendly nature, low toxicity and low volatility, easy storage and transport in the solid state, and a large volumetric H 2 density. [ 18 ] Meanwhile, formate can be easily prepared from a variety of cost‐effective routes, which provide a renewable route for H 2 storage.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Bifunctional Electrocatalysts of Palladium Decoration on Carbon Nanoarchitectures for Indirect Releasing of H₂ Stored in Formate

Liu

Chen

et al. 2021

Small Structures

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Formate has received tremendous research interest as one of the promising organic H2 carriers to store and transport H2 safely and economically. One paramount challenge for implementing the practical feasibility of formate as H2 carrier is how to release H2 at standard pressure and room temperature on demand. Herein, a proof‐of‐concept electrochemical strategy to indirectly release H2 stored in formate in a controlled manner is proposed, in which formate is electrocatalytically oxidized at the alkaline anode to release electrons, which is used for H2 generation at the acidic cathode. For this purpose, highly active bifunctional electrocatalysts with uniformly dispersed Pd nanoparticles supported on a conductive hollow dodecahedron N‐doped carbon network (Pd/hd‐NC), which not only shows one order of magnitude higher catalytic current density than the commercial Pd/C for alkaline formate oxidation reaction (FOR) but is comparable with the commercial Pt/C for acidic hydrogen evolution reaction (HER), are developed. A hybrid alkali/acid cell is developed using Pd/hd‐NC as anode and cathode catalysts of FOR and HER, respectively; in this way, H2 stored in formate can be indirectly released in a tunable manner, which presents significant steps forward, increasing the resiliency of formate as H2 carrier.

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Enhancing the selectivity of Nafion membrane by incorporating a novel functional skeleton molecule to improve the performance of direct methanol fuel cells

Abstract: Conventional fillers have limitations on the modification of proton exchange membranes because of differences in the sizes and physicochemical properties of matrix molecules.

Cited by 52 publications

References 63 publications

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

Proton Conductive, Low Methanol Crossover Cellulose-Based Membranes

High‐Performance Bifunctional Electrocatalysts of Palladium Decoration on Carbon Nanoarchitectures for Indirect Releasing of H₂ Stored in Formate

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Enhancing the selectivity of Nafion membrane by incorporating a novel functional skeleton molecule to improve the performance of direct methanol fuel cells

Abstract: Conventional fillers have limitations on the modification of proton exchange membranes because of differences in the sizes and physicochemical properties of matrix molecules.

Cited by 52 publications

References 63 publications

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

Proton Conductive, Low Methanol Crossover Cellulose-Based Membranes

High‐Performance Bifunctional Electrocatalysts of Palladium Decoration on Carbon Nanoarchitectures for Indirect Releasing of H2 Stored in Formate

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Product

Resources

About

High‐Performance Bifunctional Electrocatalysts of Palladium Decoration on Carbon Nanoarchitectures for Indirect Releasing of H₂ Stored in Formate