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

Kenta Ono, Manabu Ishizaki, Katsuhiko Kanaizuka, Takanari Togashi, Teppei Yamada, Hiroshi Kitagawa, Masato Kurihara

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


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 105-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.

Original languageEnglish
Pages (from-to)5531-5535
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number20
Publication statusPublished - May 8 2017

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry


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