Water-Stable Al(III) Coordination Polymer Glass with High Proton Conductivity toward Stable Electrolytes in a Fuel Cell

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-12-12 DOI:10.1021/acsaem.4c0231010.1021/acsaem.4c02310

Kazuki Takahashi, Tomohiro Ogawa*, Tomoya Itakura, Kenichiro Kami and Satoshi Horike*,

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引用次数: 0

Abstract

Coordination polymer (CP) glasses make up a class of solid-state proton conductors as possible electrolytes for anhydrous H₂/O₂ fuel cells. Toward these potential applications, the development of water-stable CP glasses is crucial to maintaining stable power generation over the long-term. Here, we report a water-stable Al(III)-based CP glass ((dema)_0.9[Al(H₂O)_1.8(H₂PO₄)_3.9(H₃PO₄)_1.1]). Compared to previously reported Zn-based CP glasses, the Al-based CP glass showed significantly higher hydrolytic stability due to stable coordination bonds. In addition to improved water stability, the Al-based CP glass exhibited high viscosity (η = 10¹–10⁴ Pa·s) and high ionic conductivity (>20 mS·cm^–1 at 120 °C) under anhydrous conditions. This unique property is attributed to a Grotthuss-type selective proton transport mechanism. The H₂/O₂ fuel cell power generation using this CP glass exhibited a high maximum power density (299 mW·cm^–2) and high open-circuit voltage (0.93 V) under anhydrous conditions at 120 °C. These results demonstrate that the employment of Al(III) in CP glasses is a promising strategy for the practical application of CP glasses in fuel cell devices.

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.