Grain‐Boundary‐Free Super‐Proton Conduction of a Solution‐Processed Prussian‐Blue Nanoparticle Film

Abstract

Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Recovery of Pure Methanol from Humid Gas Using Mn–Co Prussian Blue Analogue

“…The first breakthrough curve of methanol and water for the MnHCC sample is shown in Figure S10; the pristine MnHCC sample adsorbed less methanol compared with the reused MnHCC after desorption. We speculate that a strong hydrogen network, including vacancy sites, was present in the MnHCC synthesized in the aqueous solution; 31 as a result, it was difficult for methanol to replace water.…”

Surface modification enhances the bulk proton conductivity of Prussian blue

“…However, the proton conductivity of PB-SM26 displayed a sudden increase between 80% and 95% relative humidity, resulting in a high proton conductivity comparable to that of Nafion. In previous reports, grain-boundary-free PB nanofilms exhibited nonlinear curves, 23 suggesting that the nonlinearity observed for the PB nanoparticles might be attributed to surface effects.…”

“…[20][21][22] A study by Ono et al showed that a grain-boundary-free PB nanofilm with a self-assembled monolayer exhibits high proton conductivity (approximately 0.1 S cm À1 ). 23 However, proton conductors with bulk structures are more suitable for use in fuel cells than thin films. If PB can demonstrate such high proton conductivity in a bulk form, it can serve as a low-cost, fluorine-free electrolyte for fuel cells.…”

The Renaissance of Proton Batteries

“…[39] Furthermore, by controlling the valance states of the carbon-coordinated Fe ions and nitrogen-coordinated M ions, one can further vary the M/Fe stoichiometry from 1/1 to 4/3 and to 3/2 (Figure 4d-f ), among which the Turnbull's blue analogue (TBA) of M II [Fe III (CN) 6 ] 2/3 possesses the highest extent of structural defects and the richest water content. [22,71] Interestingly, the zeolitic water in cages and the ligand water in vacancy sites can form a contiguous network by hydrogen bonds, which makes it viable for the fast proton conduction via the Grotthuss mechanism (Figure 1d). Therefore, a high-rate proton battery is feasible.…”

“…Specifically, the charge of protons can be rapidly transported through the chains of water molecules via the bond vibrations of the H⋯O hydrogen bonds and H─O covalent bonds (Figure 1d), which has been discovered to be applicable to hydrous solid compounds. [22,23] This promises a superior fast-charging performance. Last but not least, protons essentially pertain to the category of nonmetal ions, which can form both ionic bonds and quasicovalent hydrogen bonds with the host frameworks, which differs from metal ions that usually bind the electrodes with ionic bonds solely.…”