Metal-organic framework membranes for proton exchange membrane fuel cells: A mini-review

Ratnamala, A.; Rao, Vandavasi Koteswara; Raja, K.

doi:10.1016/j.ica.2022.121304

Cited by 13 publications

(8 citation statements)

References 76 publications

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“…Thus, the ionic conductivity at 23 °C in the presence of ~97% RH increases to 4.24 × 10 −3 S cm −1 , which implies an improvement of two orders of magnitude. As the temperature rises, an increase in conductivity is observed until it reaches a maximum at 40 °C with a value of 9.87 × 10 −3 S cm −1 , which is considerably high for MOF and SMOF-type materials [ 74 , 75 , 76 ]. As temperature increases, there are two contrary effects affecting proton conductivity.…”

Section: Resultsmentioning

confidence: 99%

Superprotonic Conductivity in a Metalloporphyrin-Based SMOF (Supramolecular Metal–Organic Framework)

Fidalgo-Marijuan,

Ruiz de Larramendi,

Barandika

2024

Nanomaterials

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Metal–organic frameworks and supramolecular metal–organic frameworks (SMOFs) exhibit great potential for a broad range of applications taking advantage of the high surface area and pore sizes and tunable chemistry. In particular, metalloporphyrin-based MOFs and SMOFs are becoming of great importance in many fields due to the bioessential functions of these macrocycles that are being mimicked. On the other hand, during the last years, proton-conducting materials have aroused much interest, and those presenting high conductivity values are potential candidates to play a key role in some solid-state electrochemical devices such as batteries and fuel cells. In this way, using metalloporphyrins as building units we have obtained a new crystalline material with formula [H(bipy)]2[(MnTPPS)(H2O)2]·2bipy·14H2O, where bipy is 4,4′-bipyidine and TPPS4− is the meso-tetra(4-sulfonatephenyl) porphyrin. The crystal structure shows a zig-zag water chain along the [100] direction located between the sulfonate groups of the porphyrin. Taking into account those structural features, the compound was tested for proton conduction by complex electrochemical impedance spectroscopy (EIS). The as-obtained conductivity is 1 × 10−2 S·cm−1 at 40 °C and 98% relative humidity, which is a remarkably high value.

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Section: Resultsmentioning

confidence: 99%

Superprotonic Conductivity in a Metalloporphyrin-Based SMOF (Supramolecular Metal–Organic Framework)

Fidalgo-Marijuan,

Ruiz de Larramendi,

Barandika

2024

Nanomaterials

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“…When a first-order polymorphic phase transition, known as a super protonic transition, occurs at a high temperature in solid acid compounds, the proton conductivity increases by 2 to 4 orders of magnitude. The most extensively used perfluorinated sulfonated polymer, Nafion, is believed to be the best for proton-conducting materials [140]. Nevertheless, Liu et al [141] claim that {H 6 Bi 12 O 16 } /GO composite membrane had superior proton conductivity than Nafion in an aqueous solution with a value of 0.564 Scm −1 at 80 • C and also shown good performance at sub-zero temperatures with a value of 2.17 104 Scm −1 at 40 O 16 } /GO are approximately 0.52 eV and 0.24 eV from Arrhenius plots in the temperature range of 30-80 • C under 97% RH, respectively, the {H 6 Bi 12 O 16 } /GO composite showed super proton conductivity even at sub-zero temperatures and catalysed the decomposition of hydrogen peroxide.…”

Section: Super-protonic Conductors In Solid Acidsmentioning

confidence: 99%

Super–protonic conductors for solid acid fuel cells (SAFCs): a review

Afroze

Reza

Somalu

et al. 2023

Eurasian j. phys. funct. mater.

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Fuel cell holds the promise of being environmentally friendly and becomes one of the alternatives for renewable energy. Solid acids have super-protonic behavior which allows them to become conductors. It can function at high temperatures. Hydration, on the other hand, may be used to improve the performance of the solid acid. Moreover, the conductivity, stability, and crystal structure of the solid acid compounds of the fuel cell are all influenced by the size of the electrolyte membrane. Very few works have been done on solid acid fuel cells which are still under investigation to make it one viable as well as a reliable alternative to clean, renewable energy. In general, this work will provide an overview of the variables or characteristics that affect the technical effectiveness and performance of the unique super-protonic conductors for solid acid fuel cells.

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“…Studies on improving the proton conduction of PEMs have become more prevalent recently, and Table lists the reviews or perspectives of advanced membranes with enhanced performance in the last five years. Some of them primarily summarize a particular type of polymeric membranes (e.g., perfluorosulfonic acid (PFSA)-based membranes, cellulose-based membranes, polyphenylsulfone (PPSU) membranes, modified Nafion membranes), − while others concentrate on composite/blend membranes with metal–organic frameworks (MOFs) , or just merely introduce a few PEMs when overviewing the various components of PEMFCs. − To the best of our knowledge, comprehensive reviews concentrating on the in-depth discussions of the PEMs for HT-PEMFCs fabricated from the structural designs of innovative polymers or oriented modifications of backbone/branched chains, as well as the proton conductivity and fuel cell performance at elevated temperatures, are still limited. Compared with the other relevant reviews, Rhis review focuses mainly on the recent developments in PEMs used for high temperature (predominantly ≥160 °C), in terms of the preparation/modification processes, improvements in conducting properties, and underlying mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Perspectives on Membrane Development for High Temperature Proton Exchange Membrane Fuel Cells

Ying,

Liu,

Wang

et al. 2024

Energy Fuels

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High temperature proton exchange membrane fuel cells (HT-PEMFCs) are a promising energy conversion technology due to their quick reaction kinetics, high tolerance to CO impurities, and ease of heat and water management. Nevertheless, the practical implementation of this technology is limited since traditional proton exchange membranes (PEMs) exhibit significantly reduced performance at high temperatures and low humidity. In this extreme situation, researchers have concentrated on investigating new membranes through the creation of novel polymers and fillers or by suggesting sophisticated modification processes, with the goal of attaining high proton conductivity, stable mechanical properties, and tremendous temperature tolerance. This Review focuses on the latest advancements in four PEM domains: (1) perfluorosulfonic acid (PFSA)-based PEMs; (2) aromatic polymerbased PEMs; (3) polybenzimidazole (PBI)-based PEMs; and (4) polymer of intrinsic microporosity (PIM)-based PEMs. We describe and provide an overview of the preparation methods, mechanistic analysis, and core characteristics (proton conductivity and peak power density) of the aforementioned membrane materials. Furthermore, prospective research paths and challenges in the development of PEMs toward practical applications are also suggested.

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Metal-organic framework membranes for proton exchange membrane fuel cells: A mini-review

Cited by 13 publications

References 76 publications

Superprotonic Conductivity in a Metalloporphyrin-Based SMOF (Supramolecular Metal–Organic Framework)

Superprotonic Conductivity in a Metalloporphyrin-Based SMOF (Supramolecular Metal–Organic Framework)

Super–protonic conductors for solid acid fuel cells (SAFCs): a review

Perspectives on Membrane Development for High Temperature Proton Exchange Membrane Fuel Cells

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