Proton Conduction via Water Bridges Hydrated in the Collagen Film

Collagen films with proton conduction are a candidate of next generation of fuel-cell electrolyte. To clarify a relation between proton conductivity and formation of water networks in the collagen film originating from a tilapia's scale, we systematically measured the ac conductivity, infrared absorption spectrum, and weight change as a function of relative humidity (RH) at room temperature. The integrated absorbance concerning an O-H stretching mode of water molecules increases above 60% RH in accordance with the weight change. The dc conductivity varies in the vicinity of 60 and 83% RH. From those results, we have determined the dc conductivity vs. hydration number (N) per unit (Gly-X-Y). The proton conduction is negligible in the collagen molecule itself, but dominated by the hydration shell, the development of which is characterized with three regions. For 0 < N < 2, the conductivity is extremely small, because the water molecule in the primary hydration shell has a little hydrogen bonded with each other. For 2 < N < 4, a quasi-one-dimensional proton conduction occurs through intra-water bridges in the helix. For 4 < N, the water molecule fills the helix, and inter-water bridges are formed in between the adjacent helices, so that a proton-conducting network is extended three dimensional.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:11

Enthalten in:

Journal of functional biomaterials - 11(2020), 3 vom: 02. Sept.

Sprache:

Englisch

Beteiligte Personen:

Matsui, Hiroshi [VerfasserIn]
Matsuo, Yasumitsu [VerfasserIn]

Links:

Volltext

Themen:

Bio-electrolyte
Biofuel cell
Biomaterial
Collagen
Fuel-cell electrolyte
Hydration
Hydrogen bond
Ionic conduction
Journal Article
Proton conduction
Water bridge

Anmerkungen:

Date Revised 28.10.2020

published: Electronic

Citation Status PubMed-not-MEDLINE

doi:

10.3390/jfb11030061

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM314602011