Proton Conduction in Metal–Organic Frameworks and Related Modularly Built Porous Solids

Abstract

Proton-conducting materials are an important component of fuel cells. Development of new types of proton-conducting materials is one of the most important issues in fuel-cell technology. Herein, we present newly developed proton-conducting materials, modularly built porous solids, including coordination polymers (CPs) or metal-organic frameworks (MOFs). The designable and tunable nature of the porous materials allows for fast development in this research field. Design and synthesis of the new types of proton-conducting materials and their unique proton-conduction properties are discussed.

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

“…On the other hand, the proton-containing C 10 NC 3 -V 10 hybrid crystal exhibits anhydrous proton conductivity of 6.5ˆ10´5 S cm´1 at 373 K [126]. Emergence of anhydrous proton conductivity at intermediate temperatures is demanded for solid electrolyte application for fuel-cell technology [29][30][31][32][33]. Although the proton conductivity of C 10 NC 3 -V 10 is rather unstable and lower than other POM hybrid materials [34,35], the proton-containing POM-surfactant crystals would pave the way for an unprecedented class of proton conductors.…”

Protonic Conductivity of Nanocrystalline Zeolitic Imidazolate Framework 8

“…[1][2][3][4][5][6]Thestudy of protonic conductivity is a recent trend in MOFs research, mostly driven by their potential use in fuel cells. [7]MOFs can provide precisely designed frameworks with pores and channels, in which various conducting media, such as water or acidic molecules can be added to provide proton transport.Examples include linkers containing sulfonate [8][9] or phosphonate [10] groups expected to retain water and thus protons. The post-functionalizationof MOFs MIL-101(Cr) and MIL-101(Al) with sulfonic acid groups (similarly to Nafion ® ) was also attempted, but the obtained conductivity drops by about 5 orders of magnitude above 60 °C due to a decrease of the relative humidity (RH).…”

Functionalized Base‐Stable Metal–Organic Frameworks for Selective CO2 Adsorption and Proton Conduction

“…The E a value is below that whichc orresponds to proton conduction by the conventional Grotthuss mechanism (0.1-0.4 eV), in which the protons diffuse through hydrogen-bonded water networks in a proton-hopping manner. [17] The proton conductivities of Ni-BDP-CHO and Ni-BDP-CN at 25 8Ca nd approximately9 7% RH were also tested ( Figures S10 and S11). It was observed that Ni-BDP-CHO possesses the lowest protonc onductivity of 4.27 10 À6 Scm À1 ,f ollowed by Ni-BDP-CN (4.87 10 À5 Scm À1 ).…”