Effectively facilitating the proton conduction of proton exchange membrane by polydopamine modified hollow metal−organic framework

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

doi:10.1016/j.memsci.2021.120098

Cited by 37 publications

(27 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result may be because hollow HZF2 exhibited the optimized combination of proton-transfer ability and a high BET surface area, which are important parameters for the proton conductivity and IEC value. Moreover, the hollow structure retained the water molecules effectively and provided an efficient proton-transfer channel through the interconnected shell side to enhance proton conduction . Therefore, the incorporation of HZF2 into the Aquivion matrix contributed to enhancing the proton conductivity through the hollow-structured HPA-tethered porous crystalline nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the hollow structure retained the water molecules effectively and provided an efficient proton-transfer channel through the interconnected shell side to enhance proton conduction. 68 Therefore, the incorporation of HZF2 into the Aquivion matrix contributed to enhancing the proton conductivity through the hollowstructured HPA-tethered porous crystalline nanomaterials. The following explains why the other HZF proton conductors exhibited lower potential than HZF2.…”

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Ryu

Jae

Kim

et al. 2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Heteropoly acids (HPAs) have been used in perfluorinated sulfonic acid polymers such as Nafion or Aquivion to form organic/inorganic composite membranes with improved proton conductivity and water management ability. However, the HPA has a low BET surface area with water-soluble characteristics, which prevents enhancement in the number of proton-transferable sites and accelerates HPA leaching while operating the proton exchange membrane fuel cells (PEMFCs). The HPA was functionalized on zeolite imidazolate framework-67 (ZIF-67) nanoparticles to address these drawbacks. Incorporating it into the MOF made it water insoluble and enhanced the internal surface area, leading to a good proton conductor. Using a synthetic approach, we were able to form HPA-functionalized ZIF-67 (HZF), which can be optimized with simple compositional modifications and whose HPA content is controllable. The HZF nanoparticles exhibited a hollow structure that formed an HPA−ZIF shell layer because the dissociated cobalt ion and 2-methylimidazole diffused from the core side to the surface layer to interact with the HPA. The HZF/Aquivion composite membranes exhibited excellent mechanical properties and good resistance to the polymer chain swelling phenomenon. The electrochemical properties of the HZF/ Aquivion composite membranes with various HZFs were characterized to determine the optimal HPA content in the HZF nanoparticles. The 3 wt % hollow HZF/Aquivion composite membrane with the appropriate HPA content exhibited higher proton conductivities than the pure Aquivion membrane, measuring 0.14 S/cm at 25 °C and 100% RH and 0.09 S/cm at 80 °C and 30% RH. This result indicates that the hollow HZF/Aquivion composite membrane can provide efficient proton transfer and water management ability, suggesting a good strategy for the PEMFC operation.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Ryu

Jae

Kim

et al. 2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…The template-free method can self-assemble into hollow structures by the Ostwald ripening principle, the Kirkendall effect, the surface-energy-driven principle, and the partial-etching method without adding templates (Figure 5) [37][38][39]. In addition, biological reagents are also utilized as soft templates.…”

Section: Template-free Methodsmentioning

confidence: 99%

Beyond Pristine Metal–Organic Frameworks: Preparation of Hollow MOFs and Their Composites for Catalysis, Sensing, and Adsorption Removal Applications

et al. 2022

View full text Add to dashboard Cite

Metal–organic frameworks (MOFs) have been broadly applied to numerous domains with a substantial surface area, tunable pore size, and multiple unsaturated metal sites. Recently, hollow MOFs have greatly attracted the scientific community due to their internal cavities and gradient pore structures. Hollow MOFs have a higher tunability, faster mass-transfer rates, and more accessible active sites when compared to traditional, solid MOFs. Hollow MOFs are also considered to be candidates for some functional material carriers. For example, composite materials such as hollow MOFs and metal nanoparticles, metal oxides, and enzymes have been prepared. These composite materials integrate the characteristics of hollow MOFs with functional materials and are broadly used in many aspects. This review describes the preparation strategies of hollow MOFs and their composites as well as their applications in organic catalysis, electrochemical sensing, and adsorption separation. Finally, we hope that this review provides meaningful knowledge about hollow-MOF composites and their derivatives and offers many valuable references to develop hollow-MOF-based applied materials.

show abstract

“…441 By modifying the metal−organic framework DHZIF-8 with polydopamine, Rao et al very recently reported a proton conductivity under anhydrous conditions (120 °C) of 3.66 mS cm −1 , which is 2.2× higher than that of Nafion. 442 Taking further inspiration from nature, Cai et al synthesized a layered protonexchange membrane based on polydopamine, graphene oxide, and sulfonated poly(vinyl alcohol). 443 This assembly mimics the brick-and-mortar structure of nacre, with graphene oxide as the brick and the polymers as the mortar.…”

Section: Proton-exchange Membranesmentioning

confidence: 99%

“…This concept has been applied to the synthesis of PEMs with graphene oxide, SiO 2 , and CeO 2 . By modifying the metal–organic framework DHZIF-8 with polydopamine, Rao et al very recently reported a proton conductivity under anhydrous conditions (120 °C) of 3.66 mS cm –1 , which is 2.2× higher than that of Nafion . Taking further inspiration from nature, Cai et al synthesized a layered proton-exchange membrane based on polydopamine, graphene oxide, and sulfonated poly(vinyl alcohol) .…”

Section: Bioinspired Devicesmentioning

confidence: 99%

Bioinspired and Bioderived Aqueous Electrocatalysis

et al. 2022

View full text Add to dashboard Cite

The development of efficient and sustainable electrochemical systems able to provide clean-energy fuels and chemicals is one of the main current challenges of materials science and engineering. Over the last decades, significant advances have been made in the development of robust electrocatalysts for different reactions, with fundamental insights from both computational and experimental work. Some of the most promising systems in the literature are based on expensive and scarce platinum-group metals; however, natural enzymes show the highest per-site catalytic activities, while their active sites are based exclusively on earth-abundant metals. Additionally, natural biomass provides a valuable feedstock for producing advanced carbonaceous materials with porous hierarchical structures. Utilizing resources and design inspiration from nature can help create more sustainable and cost-effective strategies for manufacturing cost-effective, sustainable, and robust electrochemical materials and devices. This review spans from materials to device engineering; we initially discuss the design of carbon-based materials with bioinspired features (such as enzyme active sites), the utilization of biomass resources to construct tailored carbon materials, and their activity in aqueous electrocatalysis for water splitting, oxygen reduction, and CO 2 reduction. We then delve in the applicability of bioinspired features in electrochemical devices, such as the engineering of bioinspired mass transport and electrode interfaces. Finally, we address remaining challenges, such as the stability of bioinspired active sites or the activity of metal-free carbon materials, and discuss new potential research directions that can open the gates to the implementation of bioinspired sustainable materials in electrochemical devices.

show abstract

Effectively facilitating the proton conduction of proton exchange membrane by polydopamine modified hollow metal−organic framework

Cited by 37 publications

References 44 publications

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Beyond Pristine Metal–Organic Frameworks: Preparation of Hollow MOFs and Their Composites for Catalysis, Sensing, and Adsorption Removal Applications

Bioinspired and Bioderived Aqueous Electrocatalysis

Contact Info

Product

Resources

About