Effects of a Nanophase-Separated Structure on Mechanical Properties and Proton Conductivity of Acid-Infiltrated Block Polymer Electrolyte Membranes under Non-Humidification

被引：4

作者：

Kajita, Takato ^{[1
]}

Tanaka, Haruka ^{[1
]}

Ohtsuka, Yumiko ^{[1
]}

Orido, Tsuyoshi ^{[1
]}

Takano, Atsushi ^{[1
]}

Iwamoto, Hiroyuki ^{[2
]}

Mufundirwa, Albert ^{[2
]}

Imai, Hideto ^{[3
,4
]}

Noro, Atsushi ^{[1
,5
]}

机构：

[1] Nagoya Univ, Grad Sch Engn, Dept Mol & Macromol Chem, Nagoya, Aichi 4648603, Japan

[2] Japan Synchrotron Radiat Res Inst JASRI, Sayo, Hyogo 6795198, Japan

[3] NISSAN ARC LTD, Yokosuka, Kanagawa 2370061, Japan

[4] Fuel Cell Cutting Edge Res Ctr Technol Res Assoc, Koto Ku, 2-3-26 Aomi, Tokyo 1350064, Japan

[5] Nagoya Univ, Res Ctr Net Zero Carbon Soc, Inst Innovat Future Soc, Nagoya, Aichi 4648601, Japan

来源：

ACS OMEGA | 2023年 / 8卷 / 01期

关键词：

ION-TRANSPORT PROPERTIES; RADICAL POLYMERIZATION; MORPHOLOGY; COPOLYMER; POLYDISPERSITY; GENERATION; LIQUIDS; HYBRIDS;

D O I：

10.1021/acsomega.2c06514

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Acid-infiltrated block polymer electrolyte membranes adopting a spherical or lamellar nanophase-separated structure were prepared by infiltrating sulfuric acid (H2SO4) into polystyrene-b-poly(4-vinylpyridine)-b-polystyrene (S-P-S) triblock copolymers to investigate the effects of its nanophase-separated structure on mechanical properties and proton conductivities under non-humidification. Lamellae-forming S- P-S/H2SO4 membranes with a continuous hard phase generally exhibited higher tensile strength than sphere-forming S-P-S/H2SO4 membranes with a discontinuous hard phase even if the same amount of Sa was infiltrated into each neat S-P-S film. Meanwhile, the conductivities of lamellae-forming S-P-S/H2SO4 membranes under non-humidification were comparable or superior to those of sphere-forming S-P-S/H2SO4 membranes, even though they were infiltrated by the same weight fraction of H2SO4. This result is attributed to the conductivities of S-P-S/H2SO4 membranes being greatly influenced by the acid/base stoichiometry associated with acid-base complex formation rather than the nanophase-separated structure adopted in the membranes. Namely, there are more free H2SO4 moieties that can release free protons contributing to the conductivity in lamellae-forming S-P-S/H2SO4 membranes than sphere-forming S-P-S/H2SO4, even when the same amount of H2SO4 was infiltrated into the S-P-S.

引用

页码：1121 / 1130

页数：10