journal article·2022-07-12

Network Size Control in Coordination Polymer Glasses and Its Impact on Viscosity and H+ Conductivity

Tomohiro Ogawa, Kazuki Takahashi, Takuya Kurihara, Sanjog S. Nagarkar, Koji Ohara, Yusuke Nishiyama, Satoshi Horike

Chemistry of Materials· Volume 34· Issue 13
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Abstract

Network structures of glasses are essential to understanding their bulk mechanical and functional properties. Despite growing interests in coordination polymer (CP) and metal–organic framework (MOF) glasses, the macromolecular tuning of the coordination networks (CN) of CP/MOF glasses remains unexplored. Here, we propose the use of the CN size of CP glasses to investigate their network-dependent viscoelastic properties and proton (H+) conductivities. Structural analysis of the CP glasses having different ratios of Zn/HnPO4 (1:3, 0.875:3, 0.75:3) exhibits ratio-dependent CN sizes. These diverse CN sizes resulted in a wide range of viscosity (η = 106–101 Pa·s). The CP glasses with a wide range of viscosity exhibit, counterintuitively, similar high H+ conductivities (σ > 10–2 S·cm–1 at 120 °C) with slight network-dependent behavior. This tunable viscosity with high H+ conductivity enables the comparative analysis of CP glasses as an electrolyte layer in H2/O2 fuel cells. Each CP glass showed a high open-circuit voltage (>0.95 V) in the fuel cell, and the maximum power densities (75–150 mW·cm–2) were dominated by its viscosity rather than H+ conductivities. The CN size control provides a new class of electrolytes that overcome the trade-off between mechanical properties and ion transport dynamics.
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Research context

OpenAlex topics: Metal-Organic Frameworks: Synthesis and Applications · Conducting polymers and applications · Ionic liquids properties and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute for Integrated Cell-Material Sciences, Institute for Advanced Study, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan

Advanced Research and Innovation Center, DENSO CORPORATION, 500-1 Minamiyama, Komenoki-cho, Nisshin 470-0111, Aichi, Japan

Department of Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Ishikawa, Japan

National Institute of Advanced Industrial Science and Technology (AIST), AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan

Diffraction and Scattering Division, Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute (JASRI), Kouto, Sayo 679-5198, Hyogo, Japan

RIKEN-JEOL Collaboration Center, Yokohama 230-0045, Kanagawa, Japan

JEOL RESONANCE Inc., Akishima 196-8558, Tokyo, Japan

Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan

Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand

Funding

Japan Society for the Promotion of Science

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