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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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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在燃料电池中具有高质子导电性的水稳定Al（III）配位聚合物玻璃

配位聚合物（CP）玻璃构成了一类固态质子导体，可作为无水H2/O2燃料电池的电解质。针对这些潜在的应用，水稳定CP玻璃的开发对于长期保持稳定的发电至关重要。在这里，我们报道了一种水稳定的Al（III）基CP玻璃((dema)0.9[Al(H2O)1.8（H2PO4)3.9(H3PO4)1.1]）。与先前报道的锌基CP玻璃相比，al基CP玻璃由于稳定的配位键而表现出更高的水解稳定性。除了提高水稳定性外，铝基CP玻璃在无水条件下具有高粘度（η = 101 ~ 104 Pa·s）和高离子电导率（120℃时为20 mS·cm-1）。这种独特的性质归因于grotthuss型选择性质子输运机制。在120°C无水条件下，使用该CP玻璃的H2/O2燃料电池发电具有较高的最大功率密度（299 mW·cm-2）和较高的开路电压（0.93 V）。这些结果表明，在CP玻璃中使用Al（III）是CP玻璃在燃料电池器件中实际应用的一种很有前途的策略。

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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.