Enhancing proton conductivity in a metal–organic framework at T > 80 °C by an anchoring strategy

Abstract

A new Zr(iv)-based metal–organic framework, termed VNU-23 [Zr6O8(H2O)8(H2SNDC)4], where H2SNDC2− = 4,8-disulfonaphthalene-2,6-dicarboxylate, was synthesized. Subsequently, the anchoring strategy was employed to dock histamine into VNU-23 to enhance the proton conductivity at 95 °C and 85% relative humidity.

Proton‐Conductive 3D LnIII Metal–Organic Frameworks for Formic Acid Impedance Sensing

“…Under 98 %R H, the conductivityi ncreases from 3.06 10 À6 Scm -1 (25 8C) to 5.26 10 À5 Scm -1 (70 8C) and finally obtains the best value of 8.95 10 À4 Scm -1 (100 8C) (Figure 4b). [12,20,28,53] Obviously,t he conductivity increased significantly with the increaseo ft emperature, and the conditions also occurred at 75 %, 85 %a nd 93 %R Hs (FiguresS8-10). The optimum conductivity (8.95 10 À4 Scm -1 )o fZZU-1 is distinctly higher than that of conventional MOFs, [9,18,52] but slightly lower than that of other conductive materials.…”

Metal–Organic Frameworks and Other Crystalline Materials for Ultrahigh Superprotonic Conductivities of 10−2 S cm−1 or Higher

“…Mobile histamine as a proton‐transfer guest was confined into the densely packed sulfonic acid (Brønsted acid)‐decorated channels of a Zr‐based MOF called VNU‐23 . An anchoring strategy developed by Kitagawa et al ,.…”

“…Mobile histamine as ap roton-transfer guest was confined into the densely packed sulfonic acid (Brønsted acid)-decorated channels of aZ r-based MOF called VNU-23. [32] An anchoring strategyd eveloped by Kitagawae tal. [8a,b] was employed to dope the histamine proton-transfer agent into the pore channels to increaset he proton-conduction behavior of the doped MOF His 8.2 @NVU-23.…”

Metal–Organic Frameworks as a Versatile Platform for Proton Conductors

“…Since Kitagawa pioneered the study of loading heterocyclic organic molecules (e.g., imidazole or benzimidazole) [ 47,121–127 ] as proton carriers into the channels of MOFs to promote proton transport, it has become an effective approach to develop high‐performance electrolytes. However, it is still ambiguous that the imidazole molecules in bound or free states are more favorable for proton conduction.…”

“…To date, many MOF materials containing acid–base pairs have shown excellent proton conductivity. [ 30,126,163,164 ] Recently, Na and co‐workers extended the concept of “acid–base pairs” to the preparation of polymer hybrid membrane. [ 157 ] First, they prepared a novel side‐chain sulfonated polymer SNF‐PAEK.…”