Synergistically promoted proton conduction of proton exchange membrane by phosphoric acid functionalized carbon nanotubes and graphene oxide

Rao, Zhuang; Lan, Minqiu; Zhu, Dongya; Jiang, Li; Wang, Zhengyun; Wan, Huihai; Tang, Beibei; Liu, Hongfang

doi:10.1016/j.memsci.2022.120810

Cited by 27 publications

(24 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This compatibility effect between CNT@ZSNW‐1 with higher decomposition temperature of hydrophobic structure and Nafion backbones can improve the thermal stability of Nafion backbones for CNT@ZSNW‐1/RN membranes. Additionally, the thermal stability enhancement may be partly attributed to restrained diffusion effect of added particles on thermal decomposition products [3b] …”

Section: Resultsmentioning

confidence: 99%

“…Additionally, SRs of CNT@ZSNW‐1/RN‐2.4 decrease to 23.9 % from 30.2 % at 40 °C and to 30.1 % from 35.8 % at 80 °C when compared to those of RN. It is ascribed to the steric effect of CNT@ZSNW‐1 and electrostatic interaction between CNT@ZSNW‐1 and Nafion, which can restrain the motion of polymer chains [3b,10] …”

Section: Resultsmentioning

confidence: 99%

“…Methanol permeability is commonly tested as an essential factor to evaluate the fuel obstruction capacity of PEM [2a,3b] . As shown in Table 1, smaller methanol permeabilities are attained by composite membranes.…”

Section: Resultsmentioning

confidence: 99%

“…Carbon nanotubes (CNTs) are a kind of one‐dimensional nanomaterial with the features of favorable flexibility, continuous structure, and high aspect ratio [3b] . They have good potential as proton transfer accelerator [15] .…”

Section: Introductionmentioning

confidence: 99%

“…They have good potential as proton transfer accelerator [15] . For example, composite membranes were prepared from histidine‐functionalized CNTs/Nafion, [16] polydopamine‐modified multi‐walled CNTs (MWCNTs)/CS, [17] imidazole‐decorated MWCNTs (Im‐MWCNTs)/CS, [18] and phosphoric acid‐modified CNTs (PCNTs)/Nafion [3b] . These membranes all exhibited significantly better proton conductivities than the pure membranes.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Enhanced Proton Transfer in Proton‐Exchange Membranes with Interconnected and Zwitterion‐Functionalized Covalent Porous Material Structures

Rao

Zhu

et al. 2023

ChemSusChem

Self Cite

View full text Add to dashboard Cite

Excellent proton‐conductive accelerators are indispensable for efficient proton‐exchange membranes (PEMs). Covalent porous materials (CPMs), with adjustable functionalities and well‐ordered porosities, show much promise as effective proton‐conductive accelerators. In this study, an interconnected and zwitterion‐functionalized CPM structure based on carbon nanotubes and a Schiff‐base network (CNT@ZSNW‐1) is constructed as a highly efficient proton‐conducting accelerator by in situ growth of SNW‐1 onto carbon nanotubes (CNTs) and subsequent zwitterion functionalization. A composite PEM with enhanced proton conduction is acquired by integrating CNT@ZSNW‐1 with Nafion. Zwitterion functionalization offers additional proton‐conducting sites and promotes the water retention capacity. Moreover, the interconnected structure of CNT@ZSNW‐1 induces a more consecutive arrangement of ionic clusters, which significantly relieves the proton transfer barrier of the composite PEM and increases its proton conductivity to 0.287 S cm−1 under 95 % RH at 90 °C (about 2.2 times that of the recast Nafion, 0.131 S cm−1). Furthermore, the composite PEM displays a peak power density of 39.6 mW cm−2 in a direct methanol fuel cell, which is significantly higher than that of the recast Nafion (19.9 mW cm−2). This study affords a potential reference for devising and preparing functionalized CPMs with optimized structures to expedite proton transfer in PEMs.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%