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Grain‐Boundary‐Free Super‐Proton Conduction of a Solution‐Processed Prussian‐Blue Nanoparticle Film
Author(s) -
Ono Kenta,
Ishizaki Manabu,
Kanaizuka Katsuhiko,
Togashi Takanari,
Yamada Teppei,
Kitagawa Hiroshi,
Kurihara Masato
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201701759
Subject(s) - prussian blue , materials science , nafion , monolayer , nanoparticle , conductivity , chemical engineering , crystal (programming language) , proton , particle (ecology) , grain boundary , nanotechnology , composite material , chemistry , electrode , electrochemistry , physics , oceanography , microstructure , quantum mechanics , geology , computer science , engineering , programming language
Abstract A porous crystal family has been explored as alternatives of Nafion films exhibiting super‐proton conductivities of ≥10 −2 S cm −1 . Here, the proton‐conduction natures of a solution‐processed film of nanoparticles (NPs) have been studied and compared to those of a Nafion film. A mono‐particle film of Prussian‐blue NPs is spontaneously formed on a self‐assembled monolayer substrate by a one‐step solution process. A low‐temperature heating process of the densely packed, pinhole‐free mono‐particle NP film enables a maximum 10 5 ‐fold enhancement of proton conductivity, reaching ca. 10 −1 S cm −1 . The apparent highest conductivity, compared to previously reported data of the porous crystal family, remains constant against humidity changes by an improved water‐retention ability of the film. In our proposed mechanism, the high‐performing solution‐processed NP film suggests that heating leads to the self‐restoration of hydrogen‐bonding networks throughout their innumerable grain boundaries.